Dräger Polytron Pulsar Duct Mount Open Path Gas Detector ... · PDF file4 Dräger...

WARNINGYou must read, understand, and comply with this TechnicalManual before you use the gas detector in order to ensurethe proper operation and function of the gas detector.

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Dräger Polytron Pulsar Duct MountOpen Path Gas DetectorTechnical Manual

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Content

Content

1 For your safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

2 Intended use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

3 Parts supplied . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

4 Understanding the system . . . . . . . . . . . . . . . . . . . .5

5 Installation of a Dräger Polytron Pulsar Duct Mount Gas Detector . . . . . . . . . . . . . . . . . . . . . . . . .7

6 Installing and commissioning the Dräger Polytron Pulsar Duct Mount Gas Detector .11

7 Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

8 How to dispose of the instrument . . . . . . . . . . . . . .16

9 Certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

10 Accessories list . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

11 Fault finding guide . . . . . . . . . . . . . . . . . . . . . . . . . .18

12 The Dräger Hand Held Terminal . . . . . . . . . . . . . . .21

13 The Digital Interface AI500 . . . . . . . . . . . . . . . . . . .25

14 Using the Dräger Polytron Pulsar Duct Mount Gas Detector with HART . . . . . . . . . . . . . . . . . . . . .28

15 AMS Operator Screens and help texts . . . . . . . . . .29

16 EC Declaration of Conformity . . . . . . . . . . . . . . . . .40

Dräger Polytron Pulsar Duct Mount 3

For your safety

1 For your safety

1.1 General safety statements

Strictly follow this Technical ManualAny use of the device requires full understanding and strictobservation of this Technical Manual and the Instructions forUse provided with the device. The device is only to be used forthe purposes specified herein and in the Instructions for Use.

MaintenanceThe device must be inspected and serviced by experts atregular intervals and a record kept. Repair and generaloverhaul of the device may only be carried out by trainedservice personnel. We recommend that a service contract beobtained with Dräger for all repairs. Only authentic Drägerspare parts may be used for maintenance.Observe the chapter ‘Maintenance’.

Use in areas subject to explosion hazardsEquipment and components which are used in explosion-hazard areas and which have been inspected and approved inaccordance with International or European explosion-protection regulations may be used only under the specifiedconditions. The equipment or components may not bemodified in any manner.

1.2 Definitions of alert iconsThe following alert icons are used in this document to provideand highlight areas of the associated text that require a greaterawareness by the user. A definition of the meaning of eachicon is as follows:

2 Intended useThe Dräger Polytron Pulsar Duct Mount Gas Detector isintended for stationary, continuous monitoring of hydrocarbongases or vapours that may present an explosion hazard.

2.1 Explosion protection approvalsThe explosion-protection approvals are valid for use of thedevice in gas/vapour-air mixture of combustible gases andvapours under atmospheric conditions. The explosion-protection approvals are not valid for use in oxygen enrichedatmospheres. In case of unauthorised opening of theenclosure, the explosion-protection approval is forfeit.

European CertificationATEX Certificate number SIRA 00ATEX1175ATEX: II 2 GDEx d [ia] IIC T5 (Tamb -40 °C to +60 °C)Ex d [ia] IIC T6 (Tamb -40 °C to +40 °C)

International CertificationIEC Ex Certificate number IEC Ex SIR 04.0006IEC Ex:Ex d [ia] IIC T5 (Tamb = -40 °C to +60 °C)Ex d [ia] IIC T6 (Tamb = -40 °C to +40 °C)

FM/ANSIFM ANSI/FM 6325ANSI/ISA-12.13-04

Tested to IEC 60079-29-4(conducted by FM Approvals)

3 Parts suppliedThe Dräger Polytron Pulsar Duct Mount Gas Detectorcomes in two parts, a transmitter and a receiver. These aresupplied already assembled to their tilt assemblies alongwith their associated terminal boxes.An ‘Optical Attenuator Plate’ type AP810 fitted to the trans-mitter. Unlike other Pulsar variants, the attenuator is al-ways required.An Instructions For Use is supplied with the detector. Tech-nical Manuals are also available through local distributorsor by contacting Dräger.You will also require a commissioning kit which is orderedseparately and includes:

Hand Held terminal (HHT)4mm Allen keyTest SheetsHHT PC softwarePC Cable (HHT version)

Optional accessories as listed with their part numbers inthe ‘Accessories’ section.

WARNINGThe Draeger Polytron Pulsar Duct Mount Gas Detector has no user-serviceable parts. Unauthorised opening can lead to a safety related failure of the unit.

DANGERIndicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.

WARNINGIndicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.

CAUTIONIndicates a potentially hazardous situation which, if not avoided, could result in physical injury, or damage to the product or environment. It may also be used to alert against unsafe practices.

NOTICEIndicates additional information on how to use the product.

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NOTICEThe Dräger Polytron Pulsar Duct Mount Gas Detector is one of the family of detectors certified under the designation GD8. All certificates will refer to the GD8.

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4 Dräger Polytron Pulsar Duct Mount

Understanding the system

4 Understanding the system

4.1 Introduction

Like the open path instruments in the Dräger Polytron PulsarRange, the Dräger Polytron Pulsar Duct Mount Gas Detectordetects hazardous releases of flammable hydrocarbon gases.It achieves response times which are significantly more rapidthan conventional detectors mounted inside the duct, yetretains the advantage of slow aspirated systems that thedetector is wholly outside the duct for ease of access andservicing. There are no moving parts and no obstructions in theflow.

A transmitter sends a beam of light across the duct to areceiver which monitors the optical transmission in twoindependent wavelength channels; one corresponding to acharacteristic infra-red absorption of hydrocarbon gases, theother for reference. A release of gas carried by the flow isdetected within a second of entering the beam.

In addition to this primary measurement function, DrägerPolytron Pulsar Duct Mount Gas Detector has unique featuresto simplify installation and ensure reliable operation:

The performance of all line-of-sight instruments depends onthe accurate alignment of the transmitter and receiver towardseach other. The Dräger Polytron Pulsar Duct Mount GasDetector has internal sensors to measure the orientation of thetransmitter with respect to the receiver, and vice versa.Besides being shown graphically on a Hand Held Terminal tomake installation simple, the directional measurements can beavailable remotely during normal operation, allowing thecorrect alignment to be checked. This feature also generates apre-warning of changes in alignment before they can affectnormal operation, and prevents a detector beingcommissioned until it is correctly aligned.

There is a communication path for digital signals going fromthe receiver back to the transmitter. The receiver cancommand the transmitter to increase its flash rate at the firstindication of gas, accelerating the speed of response andmaximising the flow of information as the hazardous incidentprogresses. The link also allows the alignment display for bothtransmitter and receiver to be viewed at both locations, makingit easy for one person to install or maintain the system.

The direction sensing of the transmitter employs four separatepulsed light sources, any of which is sufficient for the gasdetection function. In the unlikely event of a source failure, thereceiver outputs a warning and the system remains fullyfunctioning until the transmitter can be exchanged.

The receiver incorporates a data-logger with a non-volatilememory, readable locally or remotely. The data provides avaluable aid for diagnosing practical problems and preventingunnecessary maintenance work. Internally the information isused to monitor slow trends of signal strength and henceinitiate a warning in good time if the lenses will requirecleaning.

In addition to these electronic and optical enhancements, theDräger Polytron Pulsar Duct Mount Gas Detector has a newmechanical design that provides exceptional stability and easeof adjustment. A cover made of 316 grade stainless steelprovides mechanical protection and reflects solar and flareradiation, minimising the temperature rise of the internalelectronics.

4.2 Hazardous area protectionThe Dräger Polytron Pulsar Duct Mount Gas Detector uses acombination of explosion protection concepts for thetransmitter and receiver. Each head unit is a Flameproof(Ex d) enclosure, incorporating both an integral cable and aconnector with a waterproof screw cover. The cable providespower and signal connections to the rest of the system throughan Increased Safety (Ex e) terminal box mounted on the samebase plate as the head. The connector provides an IntrinsicallySafe (Ex i) interface to the Hand Held Terminal, which issimilarly certified Intrinsically Safe (Ex i).

4.3 TransmitterThe transmitter is a three-wire device, normally powered by acable from the receiver. There are cable terminals for (i) 24Vdcpower; (ii) digital communication; and (iii) power and signalcommon. The connector for the Hand Held Terminal allowsdata coming from the receiver to be viewed at the transmitter,including the graphical display of orientation and signalstrength needed for alignment. The Hand Held Terminal canalso access data held within the transmitter itself, including itsserial number and a user-entered tag reference. The eye-safeoptical output through the (electrically heated) transmitter lensis mainly infrared, although a controlled amount of deep redlight is visible. An AP810 Attenuator Plate is fitted over the lensto reduce the light intensity to a level appropriate to the shortpath across a duct. Unlike other Pulsar variants which are fittedwith an attenuator for particular distance ranges, thisattenuator is always required.

There five operating modes:1 Normal Mode. Flashes of normal intensity are output twice

a second. The flash rate appears almost regular to the eye, although it is phase-coded to send directional information to the receiver. Occasionally a flash will be seen out of the normal sequence as part of an internal self-test cycle.

2 Strong Mode. Flashes of increased intensity are output at a regular 4Hz rate.

3 Alignment Mode. Flashes of normal intensity are output four times a second. It is easily distinguishable from ‘strong mode’ because there is a noticeable irregularity to the flash rate as it sends directional information to the receiver.

4 Low-supply Mode. Flashes of increased intensity are output every two seconds. This is substituted for ‘alignment mode’ if the transmitter detects that the supply voltage dips below the specified range when tested with the lens heater on. The test is only carried out during alignment (and hence at the time of commissioning the detector) so that it cannot delay a gas alarm if this coincides with a deteriorating supply.

5 Fault Mode. Flashes of maximum intensity are output at a regular 2Hz rate. This is substituted for ‘normal mode’ if the transmitter has detected that a flash tube has failed or is intermittent. It is also the way that the transmitter signals that its link from the receiver has become broken. Visually it is not distinguishable from ‘normal mode’, but is detected by the receiver to provide the warning signals. See ‘Fault Finding’ section regarding the monitoring of the flash rate sequence.


Understanding the system

4.4 Receiver

The receiver is a four-wire device, with cable terminals for (i)24Vdc power; (ii) 0-20 mA analogue current loop; (iii) digitalcommunication; and (iv) power and signal common. Theanalogue output provides fully linearised 4-20 mA gasreadings and configurable warning signals. It can be used inboth current-source and current-sink circuits. The digital linesupplies the signals to switch the transmitter mode and canoptionally be routed to the non-hazardous area to provide two-way digital communications with the AI500 interface. Like thetransmitter, the receiver has both an electrically heated lensand a port for the Hand Held Terminal, providing a clear displayof present readings and the ability to alter the Dräger PolytronPulsar Duct Mount Gas Detector’s configuration and a user-entered tag reference. For more detail about the facilitiesoffered by the AI500 and the Hand Held Terminal please see‘Digital Communications’ below and relevant sections of thisTechnical Manual.

The data logger in the receiver maintains a detailed non-volatile record for the previous seven days of operation, withconsolidated records for the previous 32 weeks. These logsinclude such essential information as supply voltage, internaltemperature, signal strength and transmitter and receiveralignment. Dräger software is available which interprets anddisplays the logged data on a PC running under MS-Windows.When used in conjunction with the AI500 interface the softwareallows a permanent archive of the detailed version to be kepton disk. The disk record will be continuous provided thereceiver log is interrogated at least once per week.

4.5 Digital communications

The comprehensive digital information that the DrägerPolytron Pulsar Duct Mount Gas Detector provides can bemade available by different routes to suit the level ofcomplexity required. In the simplest installations only the 4-20mA analogue signal is brought to the non-hazardous area.Then a pre-warning condition (such as dirty lenses ormisalignment, before they cause a loss of operation) issignalled as a DC level, configurable to be either above orbelow 4mA. For instance, the REGARD Optical Card shows‘WARN’ and energises a relay for the default 3.5mA setting.Thus alerted, the user connects the Hand Held Terminal to thereceiver head. Present readings are displayed on its screen,while past data can be downloaded into the Hand HeldTerminal’s internal memory and hence transferred to acomputer in the non-hazardous area.

Similarly, changes to the configuration settings which affectsafety can be entered (with password protection) into theDräger software running on the PC and the resultingconfiguration file carried to the Dräger Polytron Pulsar DuctMount Gas Detector in the hazardous area.

The next simplest category of installation brings the singledigital wire from the receiver into the non-hazardous area,augmenting the basic measurement carried by the 4-20 mAloop. The full array of digital information is made available bythe AI500 interface, a small unit mounted on a DIN/EN rail withterminals for up to four detectors. A separate connector for theHand Held Terminal allows the user to ‘call up’ any of the fourdetector receivers, read their measured data, change theirconfigurations, and download their logs; all as if they had goneto the detectors themselves. The AI500 also has an infrareddata output which enables a standard notebook PC to capturethe measured data and logs using the Data Wand DW100.

This method is non-contacting and allows the data be takenwith no possibility of affecting the safe operation of the system.

Finally, the most comprehensive class of installations has up to32 AI500 interfaces linked to a PC or other central system viaan EIA-RS-485 multi-drop. Dräger software running on the PCaddresses the total system of up to 128 Dräger Polytron PulsarDuct Mount Gas Detectors, providing full current and historicalinformation.

4.6 Gas calibration and zeroing

The Dräger Polytron Pulsar Duct Mount Gas Detector issensitive to a wide range of gaseous hydrocarbons, includingthe alkane series from methane to hexane. In contrast toinstruments working at 3.4µm, the difference in response todifferent alkanes is relatively small, of the order of ±30%. Thereceiver has provision for factory-installed tables providingcalibration and linearization for up to four specified gases orgas mixtures. The choice of which table is used is configurableby the user. For most applications a Methane table should beselected for mixtures that are predominantly methane, aPropane table otherwise. There is also a factory-installedoption for the receiver to be optimised for the detection ofEthylene (ethene).

Unlike conventional detectors, the built-in calibration of theDräger Polytron Pulsar Duct Mount Gas Detector needs nomanual adjustment, but a self-zeroing sequence is initiated bythe Hand Held Terminal to complete the commissioning of thedetector. The receiver checks its own and the transmitter’salignment, and checks and records the signal strength. Thezeroing can only be completed if all the checks are passed,and until then a new detector reads full scale and is notuseable. The recorded signal strength is used as a referenceto detect a loss of signal if the lenses become dirty. A DrägerPolytron Pulsar Duct Mount Gas Detector should be re-zeroedwhenever it is re-sited, cleaned or re-aligned.

The Calibration Certificate supplied with each Dräger PolytronPulsar Duct Mount Gas Detector states the lower explosivelimit (LEL) 1 or lower flammable limit (LFL) value that was usedfor each gas. Normally this is to IEC 61779-1 for detectorssupplied with an ATEX certification, or values published by theAmerican National Institute for Occupational Safety and Health(NIOSH) for those with North American and Canadiancertifications. The choice of standard used for the factorycalibration can be varied to special order.

Each receiver table covers the range 0-8 LELm and the fullrange of measurement is always available in the digital datastream. (This path-integral gas concentration, in units of LEL-metres, is the product of gas concentration in LEL and theoptical path length in metres.) The portion of the measurementrange corresponding to 0-100%LEL concentration in the ductforms the 4-20 mA span. The calculation uses the knowndistance between the transmitter and receiver lenses, which isentered by the user as part of the configuration for theinstallation.

On no account should you attempt to open the housing of thegas detector! The device does not contain any parts that canbe serviced by the user.


Installation of a Dräger Polytron Pulsar Duct Mount Gas Detector

This arises naturally from the way that all ‘line of sight’detectors work. The reading depends on the total quantity ofgas in the beam, so its correct scaling must depend on thelength of the beam as well as on the concentration of gas.

The installation kit includes plastic test sheets which mimic theinfrared absorption of the gases to be detected. They are notused for calibration but provide a convenient check that thedetector retains its factory-set calibration and is workingcorrectly. The test sheets are marked with their thickness inmicrometres (e.g. 035 = 0.035 mm). The Dräger PolytronPulsar Duct Mount Gas Detector’s Calibration Certificateincludes its response to similar sheets at the factory. Note thatdifferent sheets, each of an appropriate plastic film, are usedfor the standard Dräger Polytron Pulsar Duct Mount GasDetector and for the Ethylene- (ethene-) optimised version.

4.7 AZT and Dead-Band

Other configurable settings in the receiver (such as thequantity of gas for full-scale in the 4 20mA current loop,baseline deadband or auto zero tracking - AZT) are lessfrequently changed and are often the same for all DrägerPolytron Pulsars at the same site. The current values active inthe receiver can be read by selecting in 'Rx Main Menu'.A new configuration file can be written from the Hand HeldTerminal with in 'Rx Memory Menu'. To see the settingsthat are available to be sent, choose in the 'NotConnected' menu. To change them, connect the Hand Held toa computer in the non-hazardous area, go to in the 'NotConnected' menu, and run the Dräger software supplied.

AZT automatically cancels small deviations of gas reading thatpersist for a long time. The rate is set in units of LELm/h.Baseline deadband is the threshold of gas readings that causethe analogue output to rise above either 4mA or the WarningCurrent. AZT and baseline deadband settings should bechosen while considering the ambient condition at the point ofinstallation. In particular in harsh outdoor environments wherea slow increase of gas is not possible, higher AZT and baselinedeadband settings can be chosen. In indoor applicationswhere small leaks could lead to a slow increase of gasconcentrations, AZT and baseline deadband values must bekept at a low level. Details see: Receiver default settings.

5 Installation of a Dräger Polytron Pulsar Duct Mount Gas Detector

5.1 Choosing the path of the beamThe Dräger Polytron Pulsar Duct Mount Gas Detectorshould normally be sited as far upstream as possible in theduct to achieve the earliest detection of gas, although en-vironmental factors may modify this general rule. The location should ensure that the lenses remain clean anddry, especially when the optical path is shorter than two me-tres. When the entrance to the duct is open to the atmos-phere in an exposed location it is preferable to mount thedetector at least one duct width from the entrance to helpprevent dirt, sea spray or precipitation reaching the lenses.The path should normally be horizontal. A vertical arrange-ment is best avoided unless the enclosed space is veryclean and dry, because dirt and droplets may collect on thelower lens. When it cannot be avoided, the receiver shouldbe mounted above the transmitter. If the duct is associated with an oven, engine etc then en-sure that the Dräger Polytron Pulsar Duct Mount Gas De-tector always remains within its specified temperaturerange. This may influence the choice of position or requirethe use of a thermally insulating spacer. Similarly, the pres-sure rating of the rubber bellows used to seal the detectorto the duct must be observed.The certifications of the transmitter and receiver determinein which hazardous areas they may be located. The Codesof Practice for Europe normally allow Zone 1, Zone 2, ornon-hazardous locations but not Zone 0.The distance between the mounting faces of the transmit-ter and receiver must be between one and eight metres.Each mounting assembly adds 0.085m, making the opticalpath between the lenses 1.17m to 8.17m. If you have achoice (for instance when the path is along rather thanacross a pipe or duct) the Dräger Polytron Pulsar DuctMount Gas Detector will achieve a lower minimum detec-tion limit the longer the path is. In principle the path can beincreased for a narrow duct by installing side arms, usingstandard four-inch ANSI flanges to mate with the detectormounting plates. However, the response time will be in-creased by the time for the gas to fill the whole optical path,and this can be significant if the air in long side arms isstagnant.For mounting purposes the infra-red beam is a cylinder100mm in diameter. Thus pipe work should be not lessthan 4-inch nominal bore, and no bends or fittings shouldintercept any part of the beam.

The turbulent flow within a pipe or duct is normally sufficient toensure good mixing and hence that the concentration of the gasto be detected is uniform over the cross section. If however thereare special circumstances which are liable to cause stratification,for instance if a heavy gas can enter at the bottom of a large duct,then it is permissible to mount multiple Dräger Polytron PulsarDuct Mount Gas Detectors on the same duct. Whenever lightfrom more than one transmitter can be seen by the samereceiver they should be set to different frequency channels usingthe Hand Held Terminal to prevent mutual interference.

NOTICEIt is important to understand that the correct 0-100 %LEL reading will be obtained only if the gas detector has been correctly configured for this individual distance.

NOTICEThe Dräger Polytron Pulsar Duct Mount is supplied with default configurations as listed in the Specifica-tions section. Any changes to these default settings are carried out as part of the commissioning process.

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SETS

USERSETS

PC

iiCAUTIONOn no account should you attempt to open the housing of the gas detector! The device does not contain any parts that can be serviced by the user.

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5.2 Mounting the UnitThe Dräger Polytron Pulsar Duct Mount Gas Detector issupplied ready to attach to a standard 4 inch ANSI flat facepipe flange (see top diagram on next page) or, with the optionalDuct Wall Mounting Plate, directly onto the wall of the duct tobe monitored (see bottom diagram on next page).

The detector is supplied ready mounted to its tilt assemblycomplete with its terminal box mounted below the detector head.

In installations where space below the detector head is limitedit is possible to mount the terminal box to the left or right of thedetector head.

Although it is possible, it is not recommended that the terminalbox be mounted above the detector head as the cover cannotbe fitted in this orientation.

To mount the terminal box to the right of the detector head:1. Remove the cover fixings and cover (if fitted).2. Using the 5mm hexagon ball driver supplied undo and re-

move the four M6 flange ring screws that attach it to theflange plate.

3. Undo the four M6 clamp block screws and remove theclamp blocks.

4. Rotate the detector 90° to the required orientation and re-assemble by reversing the above procedure.

To install and commission the Dräger Polytron Pulsar DuctMount Gas Detector refer to page 11 of this manual.

Figure 1: Features and terminology

Flange Plate

Flange Gasket

Flange Ring and

Flange RingScrews(M6)

Spring Post

Locking PostLock Nut

Tilt PlateLock Nut Tilt Plate

Tilt Plate Lock Nut

Locking Post Detector HeadTransmitter or Receiver

Tilt Adjustment Nut & Tilt Locking Nut

Bellows

Spring PostLocking Nut

Pivot Post

PivotLocking Bolt

Clamp Block

Clamp Block

Clamp Block screws (M6)

8 x 3/4“ Flange Plate/Flange fixing holes

ApprovedBlanking Plug(entry for Power/Signal cable)

Terminal BoxMounting Screws (M6)

Terminal Box Cover Screws (M5)

DO NOT OPEN WHILE ENERGISED

4 x M8 Flange Plate/Duct WallPlate fixing holes

Detector Head Transmitter or Receiver

Locking Post &Tilt PlateLock Nut

Tilt Plate

Cover Fixings x 4 (M6)

Flange Plate

Tilt Adjustment Nut & Tilt Locking Nut

Communications Port

Detector Head Cable Gland

Pivot Post &Pivot Post Locking Bolt

Power and Signal Link Cable and Gland

(not supplied)

Terminal Box Cable Gland

(Ex e)

Detector Head Cable

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Cover not shown



Figure 2: Dimensions and mounting details (flange mounting) with integral Ex e terminal box

Figure 3: Dimensions and mounting details (duct mounting) with integral Ex e terminal box

Cover Removed

Infra-red beam path

Left Hand mounted Terminal Box Right Hand mounted Terminal Box

Alternative terminal box mounting

Mating Flange(not supplied)

4 INCH 150Lb (ASTM A182 ANSI B16.5)Flat face flange e.g. Lap Joint FlangeNOTE. Raised face flanges are NOT suitableMounting holes: 8 x 3/4“ on 7.5“ circle

Cover Fitted

00309807.eps

Cover FittedCover Removed

Duct Wall mounting Plateand Gasket

Duct WallMounting Plate

Holes Required in Duct WallM8 (5/16“) clearanceon 260 mm PCD

Left Hand mounted Terminal Box Right Hand mounted Terminal Box Alternative terminal box mounting

Infra-red beam path

00409807.eps



5.3 Electrical installation

The Dräger Polytron Pulsar Duct Mount Gas Detector isnormally wired as shown on page 11, with a screened powerand signal cable from the non-hazardous area (control room,marshalling cabinet etc) coming to the terminal box of thereceiver, from which a further cable carries 24V power and theinternal digital signal to the transmitter. Since the transmitterand receiver are interchangeable mechanically, the receivercan be placed at whichever end makes this cabling moreconvenient. In rare instances it will be preferred to run separatecables to the transmitter and receiver, for which an alternativewiring diagram is available from Dräger.

In the non-hazardous area the optional AI500 Digital interfacehandles the digital communications for up to four DrägerPolytron Pulsar Gas Detectors, which may be a mixture of DuctMounted and Open Path units. The wiring diagram for theAI500 can be found in ‘Digital Interface’ section.

The field cables must comply with all local regulations applyingto hazardous area installations. The power cores carry a totalpeak current of about 1.0A to the transmitter and receiver (allflash tubes and heaters on). It is essential to ensure that aworst-case combination of the maximum voltage drop in thecables, together with the lowest supply voltage which mayoccur, still provides an adequate voltage at the receiver. Forvery long cables runs it may be economic to install a local 24Vsupply, possibly powering several detectors in the samevicinity. The tables on the next page list maximum cablelengths in terms of the core size and the lowest voltage whichcould occur at the supply end of the cable.

The 4-20 mA analogue output from the receiver is self-configuring for current source and current sink circuits. Whenused as a current source the detector receiver drives a passiveresistive load (returned to signal and power common) notexceeding 500Ω. Used as a loop-powered current sink thereceiver signal terminal is connected through the loadresistance to a positive supply. The combination of the appliedvoltage and the external load must be chosen to provide atleast 5V between the signal and common terminals of thereceiver for a signal current of 20 mA. This condition willnormally be fulfilled if the signal circuit is powered by the samesupply as the Dräger Polytron Pulsar Duct Mount Gas Detectorand the load does not exceed 500Ω.

5.4 Dräger Polytron Pulsar Duct Mount Gas Detector maximum permissible power cable lengths

The following tables give the maximum cable lengths fordiffering worst case power supply voltages and core sizes. Inusing this information please note that the worst-case (lowestpossible) supply voltage should be used not the nominalstated. The lengths stated are determined by the power supplycores. If cable size and distance become excessive it may bemore economic to install a local power supply. There is nopractical limit on the distance for the signal cables, althoughthe 4-20 mA loop resistance is limited to 500 Ω total.

NOTICE1 The maximum cable runs shown here for 30V

Detectors exceed those previously published in manuals for 27V Pulsars.

2 When the AI500 Digital Interface is used the capacitance of the cable(s) linking it to the Dräger Polytron Pulsar Duct Mount Gas Detector should not exceed 100nF (e.g. 1000m of 100pF/m cable).

3 When several Dräger Polytron Pulsar Duct Mount Gas Detectors are mounted together at a remote location it may be most economic to mount a local 24VDC power supply in a suitably certified enclosure.

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Cable run in metres: To both Transmitter AND Receiver

Worst case supply:

20V 21V 22V 23V 24V 25V 26V...30V

1 mm2: 74 98 123 147 172 197 221

1.5 mm2: 111 147 184 221 258 295 332

2.5 mm2: 184 246 307 369 430 491 553

4 mm2: 295 393 491 590 688 786 885

18 AWG: 61 81 101 121 142 162 182

17 AWG: 77 102 128 153 179 204 230

16 AWG: 96 129 161 193 225 257 289

15 AWG: 122 162 203 243 284 324 365

14 AWG: 153 205 256 307 358 409 460

13 AWG: 193 258 322 387 451 516 580

12 AWG: 244 325 407 488 569 650 732

11 AWG: 308 410 513 615 718 820 923

10 AWG: 388 517 646 776 905 1034 1164

Cable run in metres: To Transmitter only

Worst case supply:

20V 21V 22V 23V 24V 25V 26V...30V

1 mm2: 114 152 189 227 265 303 341

1.5 mm2: 170 227 284 341 398 455 511

2.5 mm2: 284 379 473 568 663 758 852

4 mm2: 455 606 758 909 1061 1212 1364

18 AWG: 94 125 156 187 218 249 281

17 AWG: 118 157 197 236 275 315 354

16 AWG: 149 198 248 297 347 397 446

15 AWG: 188 250 313 375 438 500 563

14 AWG: 236 315 394 473 552 631 709

13 AWG: 298 398 497 596 696 795 895

12 AWG: 376 501 627 752 877 1003 1128

11 AWG: 474 632 790 948 1106 1265 1423

10 AWG: 598 797 997 1196 1395 1595 1794


Installing and commissioning the Dräger Polytron Pulsar Duct Mount Gas Detector

Figure 4: Connection diagram powered via receiver

6 Installing and commissioning the Dräger Polytron Pulsar Duct Mount Gas Detector

To install the Dräger Polytron Pulsar Duct Mount Gas Detectoryou require:

Polytron Pulsar Duct Mount transmitter and receiver (Sup-plied)Duct Mounting Plates, not required for flange mounting (notSupplied)Set of M8 bolts, nuts and washers (Supplied with DuctMounting Plates) Hand Held Terminal (Part of alignment kit) – see page 21. 4mm and 5mm Hexagonal Ball Driver (Part of Duct Mountalignment kit) Suitable spanner for fixing mounting plate and fixings. (Notsupplied) Steel tape measure to measure the optical path. (Not sup-plied) Set of plastic test sheets. (Part of Duct Mount alignment kit) Three M20 Ex e certified cable glands if unit is to be pow-ered via receiver. Two M20 cable glands if unit is to belinked in marshalling/control cabinet. (Not Supplied). A portable detector to check that the beam path is free ofhydrocarbon gas before zeroing (Not supplied) Nominal 24V DC power

1. Carefully unpack the equipment and check the contents ofthe boxes against the packing note. In case of shortages ordamage contact the carrier, Dräger or the distributor imme-diately. Select a suitable location for the Dräger PolytronPulsar Duct Mount Gas Detector.

2. Ensure that the optical alignment will be stable. When thedetector is bolted directly to a pipe system, a 4-inch ANSI150lb Flat Face flange should be used e.g. a lap jointflange. Do not use a raised face flange as this may causedistortion of the Pulsar Flange Plate. When mounting to aflange, the necessary rigidity will normally be provided bythe pipe work. When the Mounting Plate is used on a ductwall it may be necessary add bracing. The object is to pre-vent twisting about axes at right angles to the light path. Asa guide, the Plate should be stable within ±1mm across its300mm diameter.

3. If the Duct Wall Mounting Plate is to be used, attach it to theduct wall first using the M8 fixings and gasket supplied. The25mm washers are used to spread the load on a thin wall.The inner four M8 holes are tapped in the Duct Wall Mount-ing Plate so that the detector heads can be mounted with-out access from inside the duct.

4. Measure the distance between the mounting faces. You willbe asked for this when you configure the Dräger PolytronPulsar Duct Mount Gas Detector to read correctly.

5. If a right hand mounted terminal box is required it will benecessary to re-mount the detector on the tilt plate and theflange ring on the flange plate by following the instructionsin ‘Detector Mounting’ section. With the terminal box belowor to the left of the detector this is not necessary.

6. Remove the detector covers and mount the transmitter and re-ceiver, ensuring that the flange plate gaskets are in place andthe AP810 Attenuator Plate is fitted over the transmitter lens.

7. Connect the field cables and apply power.

During the alignment and zeroing procedure the output fromthe Dräger Polytron Pulsar Duct Mount Gas Detector will varybetween 0-20 mA. It is therefore important that all controlfunctions are inhibited.

The following sections explain how to commission the DrägerPolytron Pulsar Duct Mount Gas Detector using the Hand HeldTerminal. An IBM-PC compatible computer running Drägersoftware is also required. Please refer first to page 21, whichgives basic operating instructions for the Hand Held Terminal,and to the Help files supplied with the PC software.

+24 VDC

Commondigital (see note 5)0-20 mA

To Control Equipment

Receiverterminal boxconnections

Transmitterterminal boxconnections

Cable screen

Cable screen

+24 VDC

+24 VDC

unused (see note 5)

unused (see note 5)

digital

digital

Common

Common

Blanking Plugsupplied

1 12 2

3 34 4

5 56 6

7 7S S

E E

1 12 2

3 34 4

5 56 6

7 7S S

E E

Cable screen

LINK CABLE

To Receiver (Rx)

Ex e glandsupplied fitted

To Transmitter (Tx)

CAUTION

This diagram must be followed to ensure correct operation, whether the installation is in a hazardous area or not.For safe operation in a hazardous area you must also refer tothe certification documents and comply with all local regulations.

NOTES:1) Glands to be Ex e type, e.g. Hawke 501/453/UNIV/...2) Entry points for Link Cable and Control Equipment may be interchanged provided that the correct connections are maintained.3) The Transmitter and Receiver assemblies must be securely earthed.4) It is essential for correct operation that the Digital and Common lines of the Tx and Rx are interconnected even when they are not connected to external equipment.5) This core may be omitted if the AI500 Digital Interface is not required.

00509807.eps



6.1 Configuring the transmitter and receiver

Like two-way radios, the detector transmitter and receiver areswitchable between different frequency channels. Thetransmitter and receiver need to be set to the same channel,chosen to be different from the channels in use byneighbouring transmitters. In this case it is only transmitterswhose light can reach the receiver, directly or by reflection, thatcould cause interference. Dräger Polytron Pulsar Duct MountGas Detectors have Channels 0 to 7 available and are factoryset to 0. This will only need to be changed if more than onedetector is fitted to the same duct.

To set the channel at the transmitter and receiver with theHand Held Terminal select in the ‘Tx Main Menu’ and‘Rx Memory Menu’. At the same time you have the opportunityto enter an alphanumeric tag string up to 11 characters long.Although not required for correct operation of the detector, ameaningful tag that identifies the location of the detector isstrongly recommended. It becomes part of the data loggerrecords read out in future, allowing their source to be knownexplicitly rather than by tracing serial numbers. Likewise, thetag is available when several receivers are connected to anAI500 Digital Interface and possibly several AI500s connectedin a multi-drop, allowing any misrouting of the connections tobe quickly traced.

Before it can be used, the receiver of the dräger PolytronPulsar Duct Mount Gas Detector must be configured for theparticular location. This can be done using the Hand HeldTerminal by first loading a configuration file generated on thePC running the Dräger software. Connect the Hand HeldTerminal to the computer in the non-hazardous area, go to

in the ‘Not Connected’ menu, and follow the instructionsof the program on the PC screen. Amongst other things youwill be asked to enter is the distance between the mountingfaces that you measured. When you have disconnected theHand Held Terminal from the PC you can view the settings youhave loaded into it by selecting in the ‘Not Connected’menu. Return to the detector, connect the Hand Held Terminalto the receiver, and write the new configuration file with in ‘Rx Memory Menu’. The settings active in the receiver at anytime can be read by selecting in ‘Rx Main Menu’.

If the receiver is connected to an AI500 you may prefer toconfigure it from the non-hazardous area. That can be done byconnecting the PC directly to the Hand Held Terminal port (notthe EIA RS485 port) of the AI500 and following the on-screeninstructions of the software. It can also be done by loading theconfiguration from the PC into the Hand Held Terminal, andthence to the AI500 using the Adaptor Cable supplied with theAI500. The Hand Held Terminal will detect the new connectionand display ‘AI500 Main Menu’. Press then A B C orD to select which of the AI500 receiver terminals you require.Your choice will be confirmed by a display of the serial numberand Tag string read from the linked receiver. The procedure isnow exactly as described above, as if the Hand Held Terminalwere connected at the receiver itself.

6.2 Alignment and zeroing

The Dräger Polytron Pulsar Duct Mount Gas Detector must bealigned and zeroed when it is first installed and whenever thetransmitter or receiver is moved. Before carrying out theelectronic alignment with the Hand Held Terminal, check thatthe head units point towards each other as accurately aspossible by eye. This will save time by reducing the number ofsteps needed and ensure that you find the strong central peak.Be aware that weaker, false peaks can occur when thetransmitter and/or receiver point away from the correct axis, forinstance when light from the transmitter reflects off an adjacentsurface.

Before the detector can be zeroed and set working, you needto adjust the two tilt assemblies to point the transmitter andreceiver units accurately towards each other. The two springposts carry knurled tilt adjustment nuts to compress thesprings and vary the tilt in two planes at right angles. When thetilt is correct, it can be fixed by tightening the two tilt lockingnuts on the spring posts and the pivot locking bolt on the pivotpost. Finally the opposing lock nuts on the locking post shouldbe tightened

To adjust the tilt of either the receiver or transmitter during thealignment process:1. Undo the tilt plate lock nuts on the locking post so they are

sufficiently clear of the tilt plate to allow full movement.2. Undo the tilt locking nuts on both spring posts to allow full

movement of the tilt plate.3. Initially loosen the pivot locking bolt approximately 1 turn.

(If extreme degrees of tilt are required it may be necessaryto loosen the bolt further)

4. Connect the Hand Held Terminal to the Dräger PolytronPulsar Duct Mount Gas Detector communication port,switch it on. The detector head alignment can now be mon-itored as described below.

5. Change the tilt of the detector head by turning the knurledtilt adjustment nuts.

6. When the detector is aligned hand tighten both tilt platelock nuts on the locking post against the tilt plate then fullytighten the pivot locking bolt on the pivot post.

7. Tighten the tilt locking nuts against the knurled tilt adjust-ment nuts using the hexagon key supplied as a tommy barto prevent any unwanted movement of the tilt adjustmentnut.

8. Finally fully tighten both tilt plate locking nuts on the lockingpost.

CAUTIONThe Draeger Polytron Pulsar Duct Mount Gas Detector will not read gas concentration correctly unless the receiver is correctly configured for the individual path length. It is essential that this is done at the time of installation and whenever the receiver is replaced.

TAG

PC

SETS

USER

SETS

!

LINK

NOTICEBe sure NEVER to adjust the tilt assembly without first loosening all the lock nuts and the pivot locking bolt.

NOTICEThe following instructions assume the Polytron PulsarDuct Mount Gas Detector has been correctly mounted,and the electrical connections are as illustrated in theprevious section, and the correct power supplies havebeen provided and energised.

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6.2.1 Step 1: Initial receiver alignment

Select in the ‘Rx Align + Zero’ menu to put the receiverinto its Alignment Mode. Digital signals from the receiver willin turn command the transmitter to flash in its ‘alignment mode’(an irregular four flashes per second) and cause the Hand HeldTerminal to show an alignment screen. The live display showsthe received signal strength both numerically and as a bar-graph. Above and to the right is a cartesian ‘target’ showing theorientation of the receiver with respect to the straight line to thetransmitter lens:

Move the receiver around to be sure you have found the strongcentral peak in the signal. Now make slow adjustments in thevertical and horizontal directions alternately, each timecorrecting the direction with the greater error, until the displaylooks like the diagram. Tighten the fixings progressively inrotation to avoid shifting the alignment.

6.2.2 Step 2: Transmitter alignment Connect the Hand Held Terminal and check that the signalsfrom the receiver are being displayed. If they are absent itwould indicate that the digital link from the receiver was notconnected, usually due to a wiring fault. The signals areupdated at the flash rate of the transmitter, which should be thefour times per second of ‘alignment mode’. A regular flashevery two seconds would indicate the ‘low-supply mode’ dueto inadequate supply voltage or excessive voltage drop in thecables.At the left of the alignment screen the transmitter ‘target’ showsits orientation with respect to the straight line to the receiverlens:

First move the transmitter around to be sure you have foundthe strong central peak in the signal. Make slow adjustmentsas before, correcting the horizontal or vertical direction with thegreater error, until the display looks like the diagram. Tightenthe fixings progressively in rotation to avoid losing thealignment. The transmitter and connector covers can now bereplaced.

6.2.3 Step 3: Final receiver alignmentUse the portable detector to check that the duct is free of gas,in preparation for the zeroing procedure that follows. At thereceiver, make any final adjustment needed to centre thedisplay. This is more likely to be necessary if the initialalignment was poor, or if the operating distance is short,causing movements of the transmitter to have aproportionately larger angular effect at the receiver. Leave theHand-Held connected and the cover off for Steps 4 and 5.

6.2.4 Step 4: The zeroing procedureThe zeroing procedure must be carried out whenever theDräger Polytron Pulsar Duct Mount Gas Detector is cleaned orre-aligned. It checks the installation and stores measurementsfor the normal situation that the path is free of gas and thelenses are clean. These form the standards of comparison todetect dirt on the lenses and gas in the path, so it is essentialthat the beam is unobstructed, the temperature moderate, andthe Pulsar has been powered for at least 30 minutes. Anyassociated machinery should also be operating, especially ifthis will affect the pressure within the duct or the temperaturein the vicinity.

Select from the ‘Rx Align + Zero’ menu. There is acountdown from 32 to show the progress of the zeroing and adisplay of relevant measurements such as the receiver’s(internal) temperature and supply voltage. The countdownproceeds slowly at first, then more rapidly as the Transmitterswitches to Strong Mode. It should reach zero in about 40seconds. Unlike the open path instruments in the PolytronPulsar range, the Duct-Mounted Pulsar now carries out asecond zeroing procedure to achieve additional precision. Thecount returns to 24 and counts down to zero over a further 50seconds. The count is replaced by a zero gas reading to showthat the procedure is complete. If any of the checks on theinstallation fail the countdown will halt and re-start, eachconsequential re-test’s tolerances are made more stringenteach cycle. You are prompted to press a key to see anexplanation of the problem.

The countdown visible at the Hand Held Terminal isaccompanied by a downward ramping of the analogue currentloop signal from 20 mA (100%LEL), followed by a second rampdown from 17.6mA (85%LEL). This allows personnel in thenon-hazardous area to follow the progress of the zeroing andto check that the analogue circuit is not prevented fromreaching full scale.

ALIG

WARNINGIf the control equipment fails to indicate 100% LEL at the start of the zeroing procedure, it indicates that the resistance in the 4-20mA current-loop is too high. It is essential to investigate such a fault, which could cause under-reading of gas.

ZERO

!



6.2.5 Step 5: Verification with test sheetsThe purpose of the test sheets is described on page 7. Notethat different sheets are used for standard Polytron PulsarOpen Path Gas Detectors and those optimised to detectEthylene (Ethene). Gain access to the beam path in front of thereceiver lens by removing the four cap-head screws holdingthe flange ring to the flange plate. Pull the bellows back andslide a stack of five sheets into the beam, taking care toposition them centrally so that the edges of the beam are notobstructed.

Verify from the Hand Held Terminal screen and from the controlequipment that the complete system responds correctly, as ifto gas. If the reading is off scale, remove sheets one by oneuntil it is on scale.

Record the mean reading, together with the serial numbers ofthe transmitter and receiver for future reference. Recordingthe test sheet readings enables you to check subsequently thatthe response to gas has not been affected in any way. Youmay also wish to introduce the test sheets one by one to checkcorrect operation of the control equipment at intermediatereadings. Finally replace the flange ring and the receiver cover,ensuring all the fixings are tight.

If required, checks can also be carried out with real gas usingthe gas check kit GCK400 provided there is access to thebeam path inside the duct.

6.3 Planned maintenance

The Dräger Polytron Pulsar Duct Mount Gas Detector hasbeen designed so that it will give long and reliable service withthe minimum of maintenance. The Dräger Polytron PulsarDuct Mount Gas Detector will warn the operator if the opticsbecomes contaminated or if it becomes mis-aligned for anyreason.

Depending on the application and the environment, as well asthe work practices at the site, planned maintenance consistsof:

Checking the detectors response to gas check cards. En-suring first that any control functions have been inhibited.Cleaning the optics as necessary. Clean optics if the de-tector warns of contaminated optics or if it is known that thedetector may have been contaminated by drilling mud, oilmist, dust etc. The lenses are specially coated to assist inkeeping them clean, however if it becomes necessary toclean them care must be taken so as not to remove the lenscoating. A soft cloth with clean fresh water or Dräger Lenscleaning fluid should be used. The detector should be re-aligned and zeroed as per the instructions following anywork on the detector.

NOTICEThe set of test sheets consists of one 35 microns thick, and four 70 microns thick. Detectors operating over a long beam path will require more test sheets than those on short ones.

ii

WARNINGThe Draeger Polytron Pulsar Duct Mount Gas Detector contains no user serviceable components. In the event of suspected failure of the transmitter or receiver, the suspect unit should be returned to Dräger.NO ATTEMPT SHOULD BE MADE TO DIS-ASSEMBLE THE UNITS IN THE HAZARDOUS AREA!

!


Specification

7 SpecificationHousing: Electro-polished ANSI Type 316 marine grade stainless steel

Brackets: ANSI Type 316 marine grade stainless steel

Wall Mounting Plate: ANSI Type 316 marine grade stainless steel

Cover: Polished ANSI Type 316 marine grade stainless steel

Lens: Treated optical glass

Bellows: Chlorobutadiene-Rubber (CR)

Gaskets: Nitrile Rubber

Flange Ring: Polyacetal

Integral Cable: Armoured, Flame retardant, Halogen free, MUD resistant

Duct Width: 1.0 to 8.0 metres

Duct Pressure: 0 mbar gauge

Span: 0-100% LEL for 4-20mA. Digital indication 0-8.0 LELm

Operational limit: -40°C to 60°C (-40°F to 140°F), 800 to 1100hPa, 0 to 100% r.h

Source: Xenon flashlamps with built-in redundancy. First lamp failure causes receiver to output warning, operation continues with unchanged calibration.

Calibrations: field calibration required. Receiver holds factory-calibrations for up to four gases or gas mixtures, switchable by field configuration. The LEL/LFL values for calibrations are to IEC 61779 (factory-option of NIOSH or EN 50054). Gases detected include the alkane series methane to hexane. Receiver version optimised for ethylene (ethene) has separate part number. Warm-up time: 12s. Beam block period after power interruptions (≥ 10ms): 12s

Response Time: Normally ≤1.0 seconds to ≥90% following a step change in gas concentration.

Interference: Immune to sun, common contaminants, and flare radiation ≤2kW/m² at ≥30° to optical axis continuous (≤3kW/m² at ≥30° to optical axis for ≤20 minutes)

Alignment: :Built in sensor system with separate “radar” displays on Hand Held Terminal screen for transmitter and receiver alignment. Zeroing not possible unless correctly aligned (≤ ± 0.15°), Tolerance ± 0.6° before beam block. Orthogonal screw adjustment for tilt.

Outputs: :Self configuring current sink or source. Fully linearised 4-20 mA gas signal with Fault at 0 mA, beam block at 2mA, and a configurable Pre-warning for dirty or misaligned optics, broken Rx-Tx link, or first lamp failure (0 to 5 mA, default 3.5 mA). Over-range at 20.5 mA. %LEL = ((I (in mA)-4 mA)/ 16mA * (full scale)). Interrogation/diagnostics of the detector, locally via the Hand-Held Terminal, or remotely via 4th-wire

Connections: :Transmitter: Three wire (3rd wire optional for Rx-Tx digital link).Receiver: Four wire (4th wire optional for digital communications and Rx-Tx link).

Power Supply: Voltage: 18 - 30VDC (24VDC nominal)

Power Consumption: Rx max: 5 WTx max: 13 WCurrent: ≤ 0.95 A typical @ 24 volts DC (with heaters on at peak of Tx charging cycle)In-rush Current: 1.5A

Storage: Temperature: -40°C to 60°C (-40°F to 140°F)Humidity: 0...95% r.H.Pressure: 700...1300hPa.

Optics: Heating to eliminate condensation and icing

Mounting: Duct Wall or ANSI 4” 150lb flat face flange.

Tilt adjustment range: :±5° maximum in both of two planes

Dimensions: 385 x 230 x 332mm (flange mount excluding cable)420 x 300 x 339mm (duct mount excluding cable)

Weight: Transmitter / Receiver with mounting hardware, cover and terminal box –13kgOptional Duct Wall Mounting Plate – 1.2kg


How to dispose of the instrument

7.1 Receiver default setting

8 How to dispose of the instrumentSince August 2005, regulations concerning thedisposal of electrical and electronic devices havebeen implemented throughout the entire EuropeanUnion; these regulations are specified in the Directive2002/96/EC of the European Parliament and in

national laws relating to this device.

Special collection and recycling possibilities have beenestablished for private households. However, since the devicehas not been registered for use in private households, it cannotbe disposed of as special household waste. Therefore, youshould send it to your national Dräger distribution organisationfor disposal, which you can contact for further information.

Configuration Range Default Setting Standard receiverBeam block delay 10-255 seconds 60 seconds

Beam block to fault 0-255 minutes 60 minutes

Gas calibration (Standard Pulsar) Table 1 = MethaneTable 2 = PropaneTable 3 = VacantTable 4 = Vacant

Table 1 Methane

Gas calibration (Ethylene Pulsar) Table 1 = EthyleneTable 2 = VacantTable 3 = VacantTable 4 = Vacant

Table 1 Ethylene

4-20 mA Span 0-100% LEL 0-100% LEL

Auto Zero Tracking rate 0 - 12 LFLm per hour 0.05 LFLm per hour1

Dead-Band 0 - 0.5 LFLm 0.3 LFLm1

Static Pre-warning current 0-5mA 3.5mA

Beam block time out to Fault On/Off On

Static Pre-warning On/Off On

Auto Zero Tracking On/Off On

1 Default values or lower comply with EN 60079-29-4:2009Note: Default settings on older Pulsars. This should be taken into account when replacing older units in harsh environments.


Certification

9 CertificationInternational CertificationIECEx Certificate Number IECEx SIR 04.0006Ex d [ia] IIC T5 (Tamb = -40°C to +60°C)II 2 GDEx d [ia] IIC T6 (Tamb = -40°C to +40°C)

European CertificationATEX Certificate number SIRA 00ATEX1175Ex d [ia] IIC T5 (Tamb -40°C to +60°C)Ex d [ia] IIC T6 (Tamb -40°C to +40°C)

FM/ANSIFM ANSI/FM 6325ANSI/ISA-12.13-04

Tested to IEC 60079-29-4(conducted by FM Approvals)

Ingress ProtectionIP66/67 (with weatherproof seal)

Electromagnetic CompatibilityEN50270 FCC Part 15 Class A

Terminal BoxIncreased Safety TypeOTB-122ATEX Certificate number Baseefa07ATEX0142X

td A21 T6 T85 °CIECEx Certificate number IECEx BAS 07.0043X

Material- Glass filled polyester, flame retardant to IEC92.1, UL94V0

Ingress protection- IP66Anti static- <109 OhmImpact resistant- >2 x 7 Nm

10 Accessories listPart No. Description23 50 419 Dräger Polytron Pulsar Duct Mount ATEX

Certified

23 40 420 Dräger Polytron Pulsar Duct Mount UL Certified

23 50 421 Dräger Polytron Pulsar Duct Mount CSA Certified

23 50 450 Polytron Pulsar Duct wall mounting plate

23 50 325 Hand Held Terminal (HHT)

23 50 451 Set of Polytron Pulsar Duct Mount Test Sheets

23 50 305 Hexagonal Ball Driver 4mm

23 50 291 Lens cleaning Fluid

23 50 298 Junction Box for Polytron Pulsar Duct Mount (ATEX)

23 50 306 AI500 Digital Interface

23 50 238 Data Wand (AI500)

23 50 327 Pulsar Software (supports Polytron Pulsar Duct Mount, AI500, and HHT

23 50 326 Adaptor HHT/PC to AI500


Fault finding guide

11 Fault finding guide

11.1 The Analogue Current LoopIn most installations the first indication of detector condition isthe analogue current loop reading. To interpret it fully you needto know what digital configuration has been loaded into thereceiver. Be sure to distinguish clearly between these fourconditions:

The 4-20mA measurement rangeReadings in this range indicate gas on a linearised scalebetween zero and full scale quantity of a particular gas. Thatspan, and the choice of gas are part of the receiverconfiguration. Typically the 20mA reading corresponds to100% LEL of Methane or of Propane.

The Pre-warning levelThis current is output to warn of conditions that could,eventually, cause an inability to detect gas: misalignments ofthe transmitter or receiver, dirty lenses, or mis-triggering of aflash tube. Note that the detector retains its full sensitivity andthat any gas reading above a low, configurable thresholdoverrides the warning. Normally the level is 3.5mA and thethreshold is 0.5 LELm. However, some control equipmentcannot resolve currents below 4.0mA so 4.5mA, for instance,may be chosen. There is no ambiguity provided the currentchosen corresponds to a gas reading below the threshold.

Beam block levelAn output of 2mA shows that the detector is not able to detectgas for reasons other than a hardware fault at the receiver.They include fog or a solid obstruction in the beam path, or thatthe receiver has become misaligned by two to three times theamount that initiates the pre-warning. For compatibility withother Dräger equipment the 2mA current is fixed, but two timeintervals associated with it are configurable. The first is thetime an obstruction must stay in the beam path to cause abeam block, normally 60 seconds. The second is the time abeam block must persist to generate a Fault, normally 60minutes. In installations where beam interruptions are frequentand tolerable it may be this delayed event which promptsaction rather than the beam block itself.

A sudden release of a large amount of pressurised and/orrefrigerated gas can result in a loss of visibility caused bycondensation of atmospheric water or the released gas itself.As true for all optical open path systems, this may induce abeam block on the Pulsar which will impair Pulsar’s ability todetect the gas. The beam block warning would be activatedand reported to the user. Although the scenario is ratherunlikely, choosing shorter rather than longer path lengths wheninstalling Pulsars in this application can further reduceoccurrence. In environments where fog generated by gasleaks is a frequent problem, beam blocks should be taken asindication for potential hazards and the use of additional pointdetectors should be considered.

The Fault levelAn output below 1mA indicates that the detector requiresattention, either because of a persisting beam block (seeabove) or a hardware fault. There may be a fault either in thereceiver itself or in the cables and terminations supplying it.Note that a fault which prevents the transmitter working at allis not distinguishable from an obstruction in the path, so it willgenerate beam block rather than fault. Note too that the fault-tolerant design of the transmitter ensures that a partialmalfunction will not stop the detector working correctly.

However it does generate the pre-warning (see above) andinhibit alignment and re-zeroing. Be aware that spurious‘faults’ may be caused if the Dräger Polytron Pulsar DuctMount Gas Detector is used with control equipment from othermanufacturers without sufficient attention to detail. Analogueloops are inherently prone to small drifts. Thus a systemprogrammed to recognize any current outside 4-20mA as Faultwill do so if a zero gas reading drifts to 3.99mA. Likewise,tolerance bands of say ±0.25mA should be allowed for the pre-warning and beam block signals.

11.2 Fault findingOnce an abnormal condition has been identified from theanalogue loop signal, it is most easily investigated by lookingat the digital signals. The Hand Held terminal (HHT) can beconnected at the receiver both to view the data stream and tointerrogate the receiver configuration. At the transmitter thedata stream and the transmitter’s (less extensive)configuration are available. If the AI500 Digital Interface isinstalled then its communicator port in the Safe Area is directlyequivalent to the HHT connection at the receiver. For morecomprehensive diagnostic purposes the AI500 also allows thelong-term records from the Dräger Polytron Pulsar Duct MountGas Detector’s internal data logger to be downloaded into aportable computer via the infrared Data Wand.

Besides measured values and flags, notice that the HHTshows when new data is received with a block in the top rightcorner of the Flags display. This useful indicator pulses everyfew flashes normally, but only a few times a minute if thereceiver is not registering light from the transmitter.

Voltage and current are measured most conveniently at theterminations of the field cables in the Safe Area. Be aware,however, that voltage measurements here will not takeaccount of the volt drops in the field cables. Direct electricalmeasurements at the transmitter and receiver terminals willnot normally be possible without a safety (‘hot-work’) permit.Such measurements can be misleading, however, since thecurrent consumption varies continuously with the internalheater and transmitter charging cycles.

NOTICEThe Polytron Pulsar Duct Mount Gas Detector generates a 4-20mA signal directly proportioned to the measured gas concentration. For monitoring of potentially flammable gas concentrations, the device should be connected to an auxiliary system with latching alarms at adequately chosen signal levels.

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Fault finding guide

11.3 Problems relating to the TransmitterSymptoms Cause ActionThe detector outputs beam block. The HHT receives data only a few times a minute. The Transmitter is not flashing

The Transmitter is not powered Check power supply and cabling

The Transmitter has an internal fault Remove the Transmitter head and gimbal assembly from its mounting, replace it with a spare configured to the same Channel, and return it to the factory. Changing the transmitter will not affect the calibration of the detector, but must be re-aligned and re-zeroed in the normal way.

The Detector outputs beam block. The HHT receives data only a few times a minute. The Transmitter is flashing and there is no obstruction in the path but the receiver is blind to the flashes.

The Transmitter and Receiver are configured to different channels

Reconfigure the Transmitter and/or Receiver so that their Channels are the same.

The detector output is at Pre-warning. The HHT indicates a Transmitter fault

The Transmitter is in Fault mode because an internal test has indicated that one or more of the flash tubes failed to trigger. The test is made more stringent than normal operation by attempting to trigger the tube at a reduced voltage. A complete cycle of tests is completed a few times per hour if the flash rate is once per second.

It is not essential to replace the Transmitter urgently, because the detector remains operational and its performance is not significantly impaired. The Pre-warning may clear of its own accord. If it persists then the transmitter should be replaced at the next convenient opportunity. Remove the Transmitter head and gimbal assembly from its mounting, replace it with a spare configured to the same Channel, and return it to the factory. Changing the transmitter will not affect the calibration of the detector, but must be re-aligned and re-zeroed in the normal way.

When the detector is switched to ‘Alignment Mode’ the Transmitter flash rate fails to change to four per second, but remains at twice per second

The link is not connected between the Receiver and Transmitter

Connect the HHT to the Transmitter. The cause is confirmed if the HHT receives no data. Check the cabling and connections.

The Transmitter is in fault mode which prevents the detector being aligned and zeroed. Fault Mode is designed to allow the detector to gain access to it. However, it is not recommended to reinstall a Transmitter already in Fault Mode.

Confirm that the HHT indicates Transmitter Fault. Further action as shown above for Pre-warning.

When the detector is switched to ‘Alignment Mode’ the Transmitter flash rate fails to change to four per second, but instead remains at two per second but with increased intensity. The HHT does not show any alignment data

An internal test in the Transmitter has detected that the supply voltage is too low. The test is more stringent than an external voltmeter test because it is made with the heater switched on and at the peak changing of cycle.

Check the supply voltage at its source and that the cable run does not exceed the maximum specified for the core size used.

Several detectors are installed at similar distances. One shows lower signal strength than the others. Its alignment readings also seem to wander.

A difference of six on the HHT’s signal strength scale (in dB units) corresponds to a halving of the signal strength. Variations of a few dB between units are normal. Larger variations could indicate that a Transmitter or Receiver has been aligned onto a false peak. For instance the Receiver may see the Transmitter both directly and as a reflection in a shiny surface close to the beam path

Re-align and re-zero the detector, taking care to find the strong central peak. In some circumstances a strong reflection could cause false mis alignment warnings and need to be screened or covered.

The mountings of the Transmitter and/or Receiver are not sufficiently rigid

Provide additional bracing for the mountings. Notice that their rigidity is more important than their strength, changes in direction more important than transitional movements


Fault finding guide

11.4 Problems relating to the ReceiverSymptoms Cause ActionThe detector output is at Fault (<1mA). The HHT receives no data

The Receiver is not powered Check the power supply and cabling

The Receiver has an internal fault Remove the Receiver head and gimbal assembly from its mounting, replace it with a spare with the same configuration, and return it to the factory. Re-align and re-zero the detector in the normal way.

The detector output is at full scale (20mA) The self-zeroing sequence has not been completed

Align and zero the detector in the normal way

The detector fails to complete the self-zeroing sequence. The HHT shows flags indicating Transmitter and/or Receiver mis-alignment, even though no flags were set in normal operation.

The tests for correct alignment are made more stringent during the self-zeroing procedure. This is to give the detector the best chance of working reliably, allowing for small movements in the supporting structure over a period of time,

Check that both the Transmitter and Receiver are rigidly mounted. Carefully repeat the alignment procedure, ensuring that both the Transmitter and Receiver are aligned at the centre of the strong central peak. Restart the self-zeroing procedure.

The detector output is at Pre-warning. The HHT shows the optics flag is set.

The signal strength has remained for sometime significantly below the signal recorded when the detector was last zeroed. The margin of loss, and the interval for which it must be maintained, to generate the warning are both part of the receiver configuration. Typical values are 40% loss for more than four days

Check the lenses of Transmitter and Receiver are clean. If necessary, clean, re-align and re-zero the detector. In some locations fog may persist for longer than the chosen interval, causing warning to be generated. It may be ignored, or a longer interval entered.

The detector behaves erratically. It changes unpredictably from normal operation with HHT showing a strong signal to a beam block and little or no signal although the path is not obstructed. The HHT continues to receive data at the normal rate even when power is removed from the Transmitter.

The Receiver is seeing light from more than one Transmitter on the same Channel.

Ensure that Receivers of all detectors within sight of each other are configured to separate Channels, and that each Transmitter is configured to the same Channel as its Receiver.

The detector output is at beam block. The HHT shows the ‘RxAlign’ flag is set, even though it was not set before the beam block occurred

The optical tests which detect mis-alignment of the Receiver also serve to prevent its giving false gas readings due to partial obstruction of the beam. If a partial obstruction capable of causing a false alarm persists longer than the beam block delay it will cause a beam block that is indicated like this

Check for causes of partial obstruction and rectify

The Receiver has become sufficiently mis-aligned to cause a beam block in a time too short for the warning to be generated

Investigate the cause of the movement. The receiver may have been struck or the supporting structure may not be sufficiently rigid.

Several detectors are installed with similar configurations. One shows a lower response to the plastic test sheets than the others.

The inbuilt calibration is for the specified gas, not for solid plastic. The sheets are intended to demonstrate that the detector is working correctly, not to simulate any particular quantity of gas. It is normal for individual units to show widely differing responses to the sheets.

If required, the gas response can be tested directly and in situ using the gas cells supplied in the GCK400 kit.


The Dräger Hand Held Terminal

12 The Dräger Hand Held Terminal

12.1 DescriptionThe Dräger Hand Held Terminal is a robust and weatherproofunit, certified for use in the hazardous area. It replaces theMTL611B Communicator (based on a Psion Organiser) thatwas formerly supplied. The Hand Held Terminal is used toalign and zero the Dräger Polytron Pulsar Duct Mount GasDetector transmitter and receiver and to provide basicconfiguration and diagnostic functions. Comprehensiveconfiguration and diagnostics are also provided in conjunctionwith a personal computer located in the non-hazardous area.Thus a new configuration file can be loaded into an internalmemory from the PC, and then copied into one or more DrägerPolytron Pulsar Duct Mount Gas Detectors located in thehazardous area. Similarly, the unit can store the internal data-logger records of up to three Dräger Polytron Pulsar DuctMount Gas Detectors, and then transfer the files to the PC foranalysis or transmission.

An adaptor cable (optional) also allows the Hand HeldTerminal to be connected to the AI500 Digital Interface,through a port separate from the EIA RS 422/485 that may behard-wired into a system. It can be used to configure the tagidentification string and multi-drop node address of the AI500,and also to link through the AI500 to any of the four DrägerPolytron Pulsar Duct Mount Gas Detector receivers connectedto it. In this way the Hand Held Terminal provides all the samefunctions that it would do if connected directly to the remotereceiver in its possibly inaccessible location.

12.2 BatteryThe Intrinsic Safety certification requires that only the specifiedbattery type is used and that it be replaced in the non-hazardous area. To gain access to the battery compartment,undo the four captive screws with a Philips screwdriver andremove the transparent cover, noting that the cover is keyedfor the correct orientation. With a 2mm hexagon key loosen(but do not remove) the four socket head screws that retain themetal battery cover. Slide the cover outwards until it clears theheads of the screws and remove it. Attach the batteryconnector, slide the battery into the space provided, replacethe covers as they were and tighten the screws. Take care toorient the transparent cover in the correct keyed position or thewaterproofing gasket will not be properly compressed.

12.3 OperationSwitch the Hand Held Terminal on by pressing one of the fourkeys. It can be left to switch off automatically, or be switchedoff manually by pressing any two keys at the same time. Itconnects to the Dräger Polytron Pulsar Duct Mount GasDetector transmitter (Tx) or receiver (Rx) through theirIntrinsically Safe ports. Unscrew the knurled metal cover andscrew in the metal connector of the Hand Held Terminal’sintegral flying lead. Remember always to replace the

waterproof covers to prevent corrosion. The separate matingconnector (marked ‘Comms Port’) mounted on the body of theHand Held Terminal is for connection to the PC and alsoprovides a convenient sealed receptacle for the flying leadwhen not in use.

As soon as the Hand Held Terminal is attached to an operatingunit (Tx, Rx or AI500) it initiates a two-way dialogue todetermine the connection. The screen displays the serialnumber and tag string of the local unit, together with thecurrent measured data being output from the receiver. In mostsystems the data will be available at the transmitter as well,relayed via the digital link through which the receiver alsocontrols the transmitter’s flash rate. The data will similarly beavailable at the AI500, but only after you have chosen which ofthe four input streams is to be displayed.

Pressing any of the keys switches the display to a series ofmenus. Each menu offers four choices, corresponding to thefour keys. To keep the menu structure simple and intuitive, youare presented with just those menus that are appropriate to theconnection that has been determined (Tx, Rx, AI500 or none).Be aware, however, of two circumstances in which theautomatic connection process needs your intervention. Thefirst is when the Hand Held Terminal is moved rapidly from onedetector head to another. It detects a possible new connectionwhen there is a gap in the data stream exceeding 30 seconds.If you move to a new unit quickly enough to fool it then selectthe menu item to identify the new connection. Secondly,when the receiver switches the transmitter into its ‘strongmode’ (because gas has been detected or the beam path isattenuated) the rapid stream of data from the receiver takesprecedence over the dialogue between the transmitter and theHand Held Terminal. Simply place a hand in front of the lensfor a few seconds to break the stream and allow the dialogueto take place.

The menus are designed to be intuitive and self-explanatory.Much the best way to familiarise yourself with them is by usingthe Hand Held Terminal. The following summaries areintended only to give you an overview of what to expect.

12.4 MENUS WHEN CONNECTED TO Dräger Polytron Pulsar TRANSMITTER

TX MAIN MENU1 View current readings2 Enter Tx tag (and channel to match Rx)3 Connect to new Tx or Rx4 Alignment Mode (if no link to Rx)

The option is blanked if data from the receiver shows thatthe normal link is provided. Otherwise it toggles to asappropriate. The option leads first to a menu to select thestarting point for editing the tag string: the string currently inplace, all characters blank, or the string saved to memorywhen a tag was last sent. Often a transmitter and receiver aregiven similar tags, and those of different detectors within thesame installation follow a numerical or alphabetic sequence.The next screen provides and keys to change thechannel within its permitted range and the 11 characters of thetag string within the character set: 0123456789 ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]./

NOTICEBattery life is reduced at low temperatures. However, the unit switches off automatically whenever no key is pressed for five minutes, so the life is greatly extended in the normal circumstance that the Hand Held Terminal is used intermittently. To conserve the battery it should be removed when the unit is not in use or could be switched on accidentally, for instace in transit.

ii

NEW

READTAG

NEWON

ONOFF

TAG

+ -



12.5 MENUS WHEN CONNECTED TO Dräger Polytron Pulsar RECEIVER

RX MAIN MENU1 View current readings2 View current settings3 Connect to new Tx or Rx 4 More…

The option lists the receiver's user-selected parameters,such as the measurement span and static warning current forthe 4 20mA current loop output. The use of the option isexplained above. If your connection to the receiver is throughthe AI500 Digital Interface this option becomes to breakthe existing link and connect to another receiver if you wish.

RX ALIGN + ZERO1 Alignment Mode2 Start Rx's self-zeroing3 Stop zeroing or alignment 4 More…

The use of the and is explained in “Installing andCommissioning the Dräger Polytron Pulsar” section of themanual.

RX MEMORY MENU1 Enter Rx tag (and channel to match Tx) 2 Read Logger data from Rx into memory3 Send User-Settings in memory to Rx4 More…

The option works as above. allows the choice ofFile1, File2 or File3 to hold the logger record (which includesthe receiver's configuration), listing the serial numbers and tagstrings of the receivers whose data is currently held.

RX 4 TO 20mA TEST1 Current + 2 Current - 3 Stop test 4 More…

You can test control equipment connected to the detectorreceiver by imposing a current on its 4 to 20mA current loopoutput. + and - allow the test current to be stepped up anddown from 0.0 to 20.0mA in 0.5mA increments, starting from4.0mA. Return the receiver to its normal output modewith without exiting this menu, or with to cycleback to 'Rx Main Menu'.

12.6 MENUS WHEN CONNECTED TO AI500 DIGITAL INTERFACE

AI500 MAIN MENU1 Read tag and node address for RS4852 Enter new tag and node 3 Connect to new AI5004 Link via this AI500 to Rx A, B, C, or D

is as before, except that the permitted range of nodeaddresses is 0..32. All AI500 units respond to requests to Node0, so that address must not be used in a multidrop.The option leads to a menu choosing between the fourreceivers connected to the 'A', 'B', 'C', and 'D' terminals of theAI500 Digital Interface. Provided the selected receiver is in factconnected, the Hand Held Terminal will connect to it and showits serial number and tag string to confirm that the link has beensuccessfully established. Remember to break the link (seeabove) when you are finished.

12.7 MENU WHEN TERMINAL IS NOT CONNECTED

NOT CONNECTED1 Connect to PC2 View user-settings in memory3 View note for new users4 Connect to Tx, Rx or AI500

The option lists the serial numbers and tag strings of thedetector receivers whose data logger records are available fortransfer as File1, File2 and File3 when the appropriate Drägersoftware is run on the computer. The key lists the user-selectable parameters held in memory (such as themeasurement span and static warning current for the 4 20mAcurrent loop output) that can be transferred from the computerand used to reconfigure receivers in the hazardous area. Notethat, by contrast, in the receiver menu lists theconfiguration settings currently in place.

12.8 MaintenanceThe Dräger Hand Held Terminal requires little routinemaintenance. Periodically check the housing and cable fordamage that may allow water ingress. If necessary theenclosure may be cleaned using a damp cloth. In the event ofdamage or suspected failure the unit should be returned toDräger.

There is a screwdriver adjustment for LCD contrast, accessiblethrough a hole at the bottom right of the screen. Do not changethe original factory setting unless you are sure it is no longercorrect. In particular, avoid making changes to compensate fora weak battery or extremes of temperature, because thesetting will then be wrong in normal circumstances.

READSETS

NEWmore

SETS

NEW

LINK

ALIGZERO

STOPmore

ALIG ZERO

TAGLOG

USERmore

TAG LOG

+-

STOPmore

STOP more

WARNINGNEVER open the housing in the hazardous area!

READTAG

NEWLINK

TAG

LINK

PCSETS

NOTETR/A

PC

SETS

SETS

!



12.9 SpecificationDimensions: 133 x 145 x 75mmWeight: 800gLead length: 1 metreTemperature: -20 °C to 45 °C (operating) for

T4 temperature classificationTemperature: -20 °C to 60 °C (operating) for

T3 temperature classificationWeather seal: IP66/67Screen type: Reflective LCDGraphics: 128 x 128 pixelsText: 16 lines of 21 charactersBattery: Duracell or Procell MN1604 Sealed

Alkaline 9VBattery life: 10 hours continuous use at 21 oC

Materials-Enclosure: PolycarbonateFlying Lead: Outer sheath, PVCCable gland: PolyamideConnectors: Nickel-plated brassSwitches: PBT

12.10 Electromagnetic compatibilityEN 50081-1EN 50081-2EN 61000-6-2FCC Class A

12.11 Safety informationThese instructions are intended to inform you of all aspects ofthe Dräger Hand Held Terminal. It is vital for your safety andthat of others that its functions are understood and that everyaspect of installation, commissioning and maintenance arecarried out correctly. If you are in any doubt about any part ofthese instructions, any function of the equipment, or anyoperating procedure, please contact Dräger, or your localdistributor.

The Dräger Hand Held Terminal is intended for use inhazardous areas in conjunction with the Dräger PolytronPulsar Duct Mount Gas Detector. In non-hazardous areas itmay be connected to the Dräger AI500 Digital Interface or apersonal computer. For connection details refer to “DigitalInterface AI500” section of this Technical Manual.

The Hand Held Terminal is certified and intended for use inhazardous areas that may contain potentially explosiveatmospheres. Install and use the Hand Held Terminal inaccordance with the latest local or national regulations. InEurope the applicable standards include:

EN 60079 ELECTRICAL APPARATUS FOR EXPLOSIVEGAS ATMOSPHERES

Part 10. Classification of hazardous areasPart 14. Electrical installations in hazardous areas (oth-er than mines)Part 17. Inspection and maintenance of electrical instal-lations in hazardous areas (other than mines)

To ensure electrical safety the Hand Held Terminal should onlybe used within the parameters described in its certification andmust not be used in oxygen enriched atmospheres. Ensurethe construction materials used for the external components ofthe Hand Held Terminal are chemically compatible with theintended process application.

Use only approved batteries. Do not change the battery in ahazardous area.

The Hand Held Terminal contains no internal user serviceableparts. Unauthorised repair or modification may invalidate thehazardous area certification and the Dräger warranty. In eventof suspected failure the unit should be returned to Dräger.

WARNINGNo attempt should be made to dis-assemble in the hazardous area!

!



Figure 5: Dräger Hand Held Terminal


The Digital Interface AI500

13 The Digital Interface AI500

13.1 DescriptionThe AI500 is a compact DIN/EN rail-mounted unit, normallylocated in the non-hazardous area. It communicates digitallywith one to four Draeger Polytron Pulsar Duct Mount GasDetectors and provides easy access to their current measuredvalues, their configurations, and their internal data-loggerrecords. The measurements include not only gas reading andsignal strength, but such detailed information as supplyvoltage, temperature, noise level and the x/y alignments oftransmitter and receiver. Data is available through a hard-wired EIA RS 422/485 communications port, a separate portfor the Hand Held Terminal (or Communicator), and as aninfra-red signal to a Data Wand.

This multiplicity of functions allows the AI500 to be used insystems with different levels of complexity. In a fully-engineered installation the full current and historical data areavailable continuously to a central system via an EIA RS 485multi-drop. In the simplest, only the 4-20mA signal from eachDräger Polytron Pulsar Duct Mount Gas Detector is used forindication and control action, with states requiring operatorattention signalled as static values of the current. When aDräger Polytron Pulsar Duct Mount Gas Detector is identifiedas requiring investigation, the operator uses the non-contacting Data Wand to download the diagnostic informationinto a notebook PC. The file can then be examined locally oremailed. In all cases, the Hand Held Terminal (orCommunicator) is able to call up any one of the DraegerPolytron Pulsar Duct Mount Gas Detector receivers connectedto the AI500 and has the same functionality as if connected tothe field unit at its possibly inaccessible location.

13.2 EnvironmentalThe AI500 must be used only in a Safe (non-hazardous) areaor within a suitably certified enclosure within the hazardousarea. The atmosphere should be non-condensing and free ofcontaminants or pollutants harmful to electronic equipment.

The working temperature range is 0 °C to +55 °C for individualunits with free air circulation, and 0 °C to +45 °C for multipleunits in contact on the mounting rail. Where temperaturesexceed 45 °C, multiple units stacked on a mounting railhorizontally or vertically should be spaced a minimum of 15mmapart to allow air circulation

13.3 MechanicalMounting: 35mm symmetrical rail (to EN50 022)

32mm asymmetrical rail (to EN50 035)15mm symmetrical rail (to EN50 045)

Dimensions: Above rail 80mm (with Connector 1: +10mm)Across rail 80mm (with Connector 2 and 3:+20mm)Along rail 25mm

Weight: 120g

13.4 Power supplyPower Supply: 24V DC nominalSupply Range: 20 to 32VConsumption: 3W maximumInternal Fuse: 250mA

13.5 Electromagnetic compatibilityEN 50081-1EN 50081-2EN 50082-1EN 50082-2EN 61000-6-2FCC Class A

13.6 Infra-red outputSerial binary data is output via the Data Wand DW100 to anIBM-PC compatible portable computer running Drägerproprietary software. The infra-red coupling requires the tip ofthe Wand to be brought within 30mm of the emitters adjacentto Connector 1. Current measurements are output every 1.5sec maximum, complete historical data for four DrägerPolytron Pulsar Duct Mount Gas Detectors takes 12 sec. Theinfra-red output is automatically inhibited when the unit isaddressed via the EIA-RS-422/485 bus.

13.6.1 Connector 1: Power and Dräger Polytron Pulsar Duct Mount Digital I/O

Removable polarised connector.Phoenix Contact MST BT2.5/12-ST-5.08, 2.5mm2 (14AWG)Terminals 1,3,5,7,9,10 and 11, 12 are linked internally.

The Digital I/O ports A, B, C and D communicate bi-directionally with up to four Dräger Polytron Pulsar Duct MountGas Detector receivers. They are compatible with all variantsof the Polytron Pulsar, but not with GD series detectors.

Terminal: Function:1 Common

2 Digital I/O Dräger Polytron Duct Mount Receiver A

3 Common

4 Digital I/O Dräger Polytron Duct Mount Receiver B

5 Common

6 Digital I/O Dräger Polytron Duct Mount Receiver C

7 Common

8 Digital I/O Dräger Polytron Duct Mount Receiver D

9 Common (Power Supply 0V)

10 Common (Power Supply 0V)

11 Power Supply +24V

12 Power Supply +24V

Digital current loop: Logic 1 (Mark):Logic 0 (Space):

0 mA5 mA

Data rate: 1200 bits / s

Protocol: proprietary

Data integrity: CRC-16 checksum



13.6.2 Connector 2: EIA-RS-422/485 Serial Port

Removable polarised connectorPhoenix Contact MC 1.5/06-ST-3.81, 1.5mm2 (16AWG)

For two-wire operation Terminals 15, 17 and 16, 18 can belinked internally with jumpers, accessed by removing the frontcover. The driver capability allows up to 32 AI500 units to beaddressed in a four-wire multi-drop system, giving access to atheoretical maximum of 128 Dräger Polytron Pulsar DuctMount Gas Detectors. In practice, the number of units willnormally be determined by considerations of polling rate. Thenode address of each unit in the range 1-32 is held in non-volatile memory and can be configured using the Hand HeldTerminal (or Communicator). All units respond to the nodeaddress 0. Similarly, each unit can be assigned an 11-character tag string to identify it independently of its nodeaddress. This, together with the ability to assign tag strings toindividual Dräger Polytron Pulsar Duct Mount Gas Detectors,allows quick and certain checking of the complete system atcommissioning time.

The markings A, B, A´, B´ are as defined in ISO/IEC 8482. Themarkings (+) and (-) show the polarity for Binary 1, stop-bit andidle state. The host (master) system must provide idle-statebiasing with this polarity. The +5V dc supply is provided for thatpurpose, or to power an RS485-to-RC232C converter, such asthe Amplicon 485F9i. The port, including the 5V supply, iselectrically isolated from the 24V supply and the DrägerPolytron Pulsar Duct Mount Gas Detector wiring.

13.6.3 Connector 3: Hand Held Terminal Port

Removable polarised connectorPhoenix Contact MC 1.5/06-ST-3.81, 1.5mm2 (16AWG)The adaptor cable Dräger 2350326 allows connection of theHand Held Terminal (or Communicator). The port complieswith the requirements of its Intrinsic Safety certification.

13.7 Communicating with the AI500 Digital Interface

For most purposes the AI500 can be used with equipment andsoftware supplied by Dräger, relieving the user of the need toknow the details of its digital communications. Information canbe provided for writers of software for a remote processor,acting as Master of a multi-drop system, to address one ormore AI500 units as Slaves. For this purpose the AI500 actsas a dual-port memory which is automatically filled with themost up-to-date values for a wide range of measuredparameters from the connected Dräger Polytron Pulsar DuctMount Gas Detector’s (gas reading, signal and noise levels, xy alignments of transmitter and receiver, supply voltage,temperature etc), their internal configurations (gas calibration,serial number, tag designation etc), and their internal datalogger records. The data is available for immediate access atdata rates of 1200 or 9600 baud.

13.8 Summary of Dräger ProtocolAll data is binary in frames of fixed length. Bytes are 8-bit, non-parity, sent least significant bit first with one stop bit. A ShortFormat frame of five bytes is used for simple commands andacknowledgements. A Long Format frame of 24 bytes or anExtra-long Format frame of 263 bytes is used to transfer dataand configurations. Configurations are 16 byte blocks,including an internal CRC 16 checksum in addition to the CRC16 checksum used to transmit them. If synchronisationbetween Master and Slave is lost then any garbled orincomplete frame is discarded after a checksum error, a stopbit error or the absence of an expected start-bit after two bytedurations.

Terminal: EIA-RS-422/485 Function:13 0V (ref)

14 +5V dc out (100mA max)

15 TXB (+)

16 TXA (-)

17 RXB’ (+)

18 RXB’ (-)

Terminal: Optical Isolator Function:19 Emitter (volt-free output - )

20 Collector (volt-free output + )

21 Anode (volt-free input +)

22 Cathode (volt-free input -)



Figure 6: Dräger Polytron Duct Mount Digital Interface AI500


Using the Dräger Polytron Pulsar Duct Mount Gas Detector with HART

14 Using the Dräger Polytron Pulsar Duct Mount Gas Detector with HART

14.1 DescriptionThe HART enhanced Dräger Polytron Pulsar Duct Mount Gas Detector allows basic digital communications between the receiverin the field and the safe area without the need for extra cable cores. The digital signals are overlaid on the 0-20mA analoguecurrent as a symmetrical modulation, ensuring that the integrity of the normal reading remains unaffected. The Dräger PolytronPulsar Duct Mount Gas Detector is fully compatible with Version 5 standards for a slave device published by the HartCommunication Foundation (HCF). Thus Pulsar inputs to a multiplexer can be mixed with those from any other HART-compatibledevice, including Dräger point detectors:

Figure 7: A typical HART installation

Normally the multiplexer is interfaced to a central computer running the Asset Management System (AMS) from EmersonProcess Management. Although rudimentary operation is possible using default settings (for instance using a HART Hand HeldCommunicator), it is important to use the AMS Pulsar Installation Kit that implements the Pulsar-specific Device Description (DD)and Windows Resource File (WRF) to customise AMS. The screen displays it provides for the operator are shown in ‘AMS’section, which include the context-specific help texts available by pressing the F1 key.

It is important to note that a HART Hand-Held Communicator does not replace the Dräger Polytron Pulsar Duct Mount GasDetector Hand Held Terminal, since it lacks the real-time graphics display required for alignment and zeroing. Certainconfiguration settings, which normally remain at their factory-default values, also require the Dräger Polytron Pulsar Duct MountGas Detector Hand Held Terminal to install PC generated configuration files. The Hand Held Terminal is likewise required todownload data-logger records from the receiver. In general the strength of the HART protocol lies in its convenience for basicmaintenance tasks. As such it offers relatively slow, low integrity communications. Consequently, the number of devices of allkinds that can be addressed in a HART system is normally limited by the response times to operator requests and, mostimportantly, HART data should never be used for safety-critical purposes. For installation instructions, refer to the documentationsupplied by the manufacturer of the multiplexer to be used, and by Emerson for the AMS system. Although Dräger Polytron PulsarDuct Mount Gas Detector is not intended to be used in a HART multi-drop configuration (not to be confused with the RS485 multi-drop shown above) for normal operation, it is possible for up to ten Dräger Polytron Pulsar Duct Mount Gas Detector receiversto be so connected in the absence of their transmitters. For instance, receivers could be powered up sequentially on a workshopbench to configure their individual tags before they are installed. The HART tag corresponds to the first eight characters of thelonger Dräger Polytron Pulsar Duct Mount Gas Detector receiver Tag, so the Dräger Polytron Pulsar Duct Mount Gas DetectorHand Held Terminal provides an alternative way to set and check the tags that will be used for HART addressing.

PC running Emerson AMS Software

RS232 / RS485 Converter

RS485 multidrop (max 31 x MTL4841)

1

32

Normal 0-20mA outputs to control equipment

HART multiplexor MTL4841 + 2 x MTL4842 (max)

0-20mA analogue current loops with

HART digital signals

1

32

Pulsar Receivers or other HART devices 1 to 32 (max 256)


AMS Operator Screens and help texts

15 AMS Operator Screens and help textsFigure 8: Process variables of AMS Tag

1 Measurement of concentration times path length, giving an indication of the risk potential due to flammable gases and vapours. LFL (lower flammable limit) means the same as LEL (lower explosive limit). As an example, a concentration of 50% LFL filling 3 metres of the beam path reads 1.5 LFLm.

2 Tag- Text that is associated with the Field Device installation. This text can be used in any way. A recommended use is as a unique label to a plant that correlates to a Field Device label: a plant drawing, or on a Control System. It can also be used as a data link layer address handle. Be aware that the HART tag is just the first 8 characters of the 11 character tag that can be read and set by the Dräger Polytron Pulsar Hand Held Terminal.

3 The unique serial number shown on the exterior label of the Dräger Polytron Pulsar Receiver, where it is prefixed by 70... (The transmitter will have an unrelated serial number because Dräger Polytron Pulsar Transmitters of the same type can be interchanged at will.)

4 Descriptor- Text that is associated with the Field Device. This text can be used by the user in any way. There is no specific recommended

5 Dräger Polytron Pulsar is not intended to be used in a HART multidrop for normal operation. However, several Pulsar Recievers can be so connected for bench testing in the absence of a Transmitter. Each Receiver will then be in beam block and contribute 2mA to the total signal current.

6 Date- Gregorian calendar date that is stored in the Field Device. This date can be used by the user in any way. There is no specific recommended use.

7 Message- Text that is associated with the Field Device. This text can be used by the user in any way. There is no recommended use.

8 Open Path: The gas reading expressed as a percentage of the 4-20mA range (to a maximum of 254%). Duct-mounted: the gas reading expressed as a percentage of the 4-20mA range (to a maximum of 254%). For the particular case of a Duct-mounted Dräger Polytron Pulsar configured to read 0-100% LFL for 4-20mA, this number can be read directly as %LFL

1 2

3

4

56

7

89

10

11

12

13

01009807.eps



9 Upper Range Value - The gas reading which produces an Analogue Output of 20mA and a Percent Range of 100%. It is not recommended to set the URV below 4.0 LFLm unless the operating environment is clean and dry, the ambient temperature is relatively stable and the measurement beam will not be obstructed.

10 Analog Output Value- Value that tracks the Digital Value representation, under normal operating modes.

11 The Supply voltage measured by the Receiver is the applied voltage less the voltage drop in the cable.

12 Signal strength depends on the operating distance and the presence of fog. Misalignment of the Transmitter and the Receiver and dirt on their lenses can also affect this value.

13 The internal temperature of the Dräger Polytron Pulsar Receiver. Normally a few degrees above ambient temperature due to internal power consumption and the lens heater.



Figure 9: Status of AMS Tag (Dräger Polytron Pulsar Status)

1 Please state this error code if you need assistance from the service support centre.

2 The 4-20mA Analog Output is at Fault level (<1mA) because of a Hardware Fault or because beam block has timed out to Fault. Please see Diagnostics Tab.

3 The 4-20mA Analog Output is at beam block level (2mA). The Dräger Polytron Pulsar is unable to detect gas for some reason. Please see Diagnostics Tab.

4 The supply voltage at the Receiver end of its cable is out of limits. This is not yet affecting the operation.

5 The internal temperature of the Receiver is unusually high or low. This is not yet affecting the operation.

6 Transmitter reports some Xenon tube mistriggering OR the digital link between the Receiver and the Transmitter has broken. The Dräger Polytron Pulsar remains operational but should be serviced if this indication persists. The sensitivity to gas is not affected.

7 The Transmitter is not pointing exactly towards the Receiver. This is not yet affecting the operation.

8 Receiver Misalignment Pre-Warning”, The misalignment of the Receiver towards the Transmitter exceeds 50% of the allowed range OR the Receiver lens is partially obstructed. This is not yet affecting the operation.

9 Warning of Attenuator plate absent from Transmitter OR pre-warning of dirty lens. Please see Diagnostics Tab.

5

4

3

2

6

8

7

91

01109807.eps



Figure 10: Status of AMS Tag (Diagnostics)

1 The Analog Output is at beam block level (2mA). However, the cause has been removed and the Dräger Polytron Pulsar is expected to restart operation in a few seconds.

2 Gas reading shows a negative value. Before re-zeroing please check for obstructions in the beam, misalignment or lens contamination.

3 The signal-to-noise ratio is too poor for measurement. This could be due to dense fog or an obstruction in the beam path.

4 The Receiver is unable to 'see' the Transmitter. Possible causes: (1) Obstruction in beam path (2) Receiver and Transmitter not set to the same channel (3) A nearby Dräger Polytron Pulsar set to the same channel (4) Transmitter not powered (5) Transmitter and/or Receiver grossly misaligned.

5 The Optics Warning flag is set because the signal strength is very high. Please check that the appropriate attenuator plate is fitted to the Transmitter for the Tx/Rx operating distance

6 The Analog Output is at Fault level (<1mA) because a beam block state has persisted for longer than the configured time limit

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Figure 11: Configuration Properties of AMS Tag (Basic Set up)

1 Final Assembly Number- Number that is used for identification purposes, and is associated with the overall Field Device.

2 Lower Range Value - For Dräger Polytron Pulsar this value is always zero.

3 Duct-mounted: Upper Range Value - The gas reading which produces an Analog Output of 20mA and a Percent Range of 100%. For a duct-mounted Dräger Polytron Pulsar the URV (in units of LFLm) is set equal to the path length through the gas (in metres) so that the URV corresponds to 100%LFL.

4 Open Path: Upper Range Value - The gas reading which produces an Analog Output of 20mA and a Percent Range of 100%. It is not recommended to set the URV below 4.0 LFLm unless the operating environment is clean and dry, the ambient temperature is relatively stable and the measurement beam will not be obstructed.

5 Open Path: Lower Limit to which the Analog output Upper Range Value can be set in any circumstances. It is not recommended to set the URV below 4LFLm unless the operating environment is clean and dry, the ambient temperature is relatively stable and the measurement beam will not be obstructed.

6 Upper limit of gas reading to which the Analog output Upper Range Value can be.

7 Duct-mounted: For a duct-mounted Dräger Polytron Pulsar the Upper Range Value (in units LFLm) is set equal to the path length through the gas (in metres) so that the URV corresponds to 100%LFL. Therefore this lower limit determines the minimum permitted path.

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Figure 12: Configuration Properties of AMS Tag (HART Setting)

1 Universal Revision- Revision of the Universal Device Description that the Field Device conforms to.

2 Field Device Revision- Revision of the Field Device Specific Device Description that the Field Device conforms to.

3 Number of Request Preambles- Number of Preambles required from the Host request by the Field Device.

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Figure 13: Configuration Properties of AMS Tag (Device)

1 Ethylene filters: Version of Dräger Polytron Pulsar optimized to measure Ethylene (Ethene) in the beam path.

2 Standard filters: Version of Dräger Polytron Pulsar optimized to measure most common hydrocarbons, including the alkane series, but not Ethylene (Ethene).

3 Duct-mounted: This Dräger Polytron Pulsar is a version to be installed within ventilation ducts. In this special situation any gas is expected to be uniformly diluted across the beam path. The Dräger Polytron Pulsar can then be configured to output 0-100 %LFL.

4 Open Path: This is the standard configuration of the Dräger Polytron Pulsar, not the Duct-Mounted version.

5 Issue of the Receiver Main Processor firmware (23 = version 2.3 etc). This processor is used for the Dräger Polytron Pulsar’s measurement functions. Unlike the separate processor used for HART communications it is field-programmable for future upgrade.

6 Issue of the Receiver HART Processor firmware (23 = version 2.3 etc). This processor is used for the Dräger Polytron Pulsar’s HART communication. It is separate from the processor used for Dräger Polytron Pulsar’s measurement functions. It is fixed at the time of manufacture.

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Figure 14: Configuration Properties of AMS Tag (Configuration)

1 If BB timeout to Fault is enabled a beam block that persists for longer than the configured time limit will cause the Analog Output to be Fault level (<1mA).

2 If the Warning Current output is enabled then any of the warnings listed below cause this output in place of 4.0 mA, provided there is no gas reading exceeding the deadband. Thus it provides an indication that more information is available, but does not affect the measurement of gas. The default setting 3.5mA causes the Dräger Regard Optical card to display 'WARN'. The warnings are for: Optics; Receiver Supply; Receiver temperature; Receiver Alignment; Transmitter; Transmitter Alignment. Please refer to the Dräger Polytron Pulsar Status tab for their individual descriptions.

3 Proper selection of Channel avoids interference with other instruments nearby. Receiver and Transmitter must have the same Channel whereas neighbouring Dräger Polytron Pulsar’s should be set to a different Channel.

4 Auto-Zero Tracking allows small gas readings that persist for a long time to be interpreted as zero drift and automatically cancelled. It must not be enabled in installations where a slow build up of gas concentration is possible.

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Figure 15: Configuration Properties of AMS Tag (Configuration)

1 Auto Zero Tracking rate - When enabled AZT allows small gas readings that persist for a long time to be interpreted as zero drift and automatically cancelled. This value is changed automatically when you change the URV for any Duct-Mounted Dräger Polytron Pulsar, or for an Open Path Dräger Polytron Pulsar below 4.0 LFL m.

2 If the beam is obstructed (or Dräger Polytron Pulsar is unable to provide a valid gas reading due to any other reason) for longer than this configured time limit then the Analog Output will be at beam block level (2mA).

3 Duration for Best Recent Strength. This is one of two parameters Dräger Polytron Pulsar uses to determine whether the lenses need cleaning. Dirty lenses cause a continuing loss of signal strength which is not immediately distinguishable from the day-to-day variations caused by fog etc. The Optics Warning is issued only when a signal loss greater than the 'Reduction BRS' parameter persists for longer than 'Duration BRS'.

4 Reduction in Best Recent Strength. This is one of two parameters Dräger Polytron Pulsar uses to determine whether the lenses need cleaning. Dirty lenses cause a continuing loss of signal strength which is not immediately distinguishable from the day-to-day variations caused by fog etc. The Optics Warning is issued only when a signal loss greater than the 'Reduction BRS' parameter persists for longer than 'Duration BRS'

5 Baseline deadband (LFLm) - The threshold gas reading that causes the Analogue Output to rise above either 4mA or the Warning Current. It ensures that insignificant fluctuations around the baseline are not visible. This value is changed automatically when you change the URV for any Duct-Mounted Dräger Polytron Pulsar, or for an Open Path Dräger Polytron Pulsar below 4.0 LFLm.

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Figure 16: Configuration Properties of AMS Tag (Last zeroing)

1 Proper selection of Channel avoids interference with other instruments nearby. Receiver and Transmitter must have the same Channel whereas neighbouring Dräger Polytron Pulsar’s should be set to a different Channel.

2 Duration Dräger Polytron Pulsar has operated. This total is maintained by a non-volatile memory within the Dräger Polytron Pulsar Receiver. A period up to 2 hours may be lost when the Receiver is re-powered.

3 Signal strength depends on the operating distance and the presence of fog. Misalignment of the Transmitter and the Receiver and dirt on their lenses can also affect this value.

4 Signal strength recorded at time of last zeroing. This value is subsequently compared with the Best Recent Strength to determine whether the lenses of the Transmitter and Receiver need cleaning.

5 The value of 'Operation Hours' recorded the most recent time the Dräger Polytron Pulsar was zeroed.

6 The Dräger Polytron Pulsar was set to this channel when last zeroed.

7 The Dräger Polytron Pulsar was last zeroed without the data link connected between Receiver and Transmitter.

8 The Dräger Polytron Pulsar was last zeroed with other equipment than an ES (2/4Hz Enhanced Speed)

9 Device has never been zeroed. In this case further data corresponding with the last zeroing are of no meaning.

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Figure 17: Configuration Properties of AMS Tag (Gas table)

1 Up to four Gas Tables can be factory-installed in the Dräger Polytron Pulsar Receiver. One of those can be selected to best suit the application. Unsuitable selection may lead to incorrect readings and alarm levels.

2 Standard of LEL values being used to calculate table IEC: IEC 60079-20EN50054: EN50054 NIOSH: NIOSH ICSCnot spec.: This table is empty.unknown: Calibration standard unknown in this version of the device description. Contact the supplier for an upgraded version.

3 This of the four Gas Tables is being used to calibrate and linearise the gas reading.

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EC Declaration of Conformity

16 EC Declaration of Conformity

DFO 137 issue 1.6 July 2011

Tel: +44 1670 352891 Fax: +44 1670 356266 www.draeger.com

Registered in England No. 777464Draeger Safety UK Limited BlythNorthumberland NE24 4RG United Kingdom

EC DECLARATION OF CONFORMITY We

Draeger Safety UK Ltd Drakes Court Langage Business Park PlymouthPL7 5JY England

Declare that Gas Detector type GD8

In accordance with Directive 94/9/EC (Equipment and protective systems intended for use in potentially explosive atmospheres), is in conformance with the EC-Type Examination Certificate

Sira 00ATEX1175

For equipment group and category

II 2 GD EEx d[ia] IIC T6 (Tamb = -40oC to + 40oC)

EEx d[ia] IIC T5 (Tamb = -40oC to + 60oC)

Issued by Sira Certification Service Rake Lane, Eccleston, Chester, CH4 9JN, England

Notified body number 0518

The standards listed below have been checked against EN60079-0:2006, EN60079-11:2007, EN61241-1:2006. The differences between them affecting the latest technical knowledge with regard to this product having been addressed

Harmonized standards EN 50014:1997 (amendments 1 & 2), IEC 60079-1:2007 EN 50020:1994, EN 50281-1-1:1998

The above mentioned product complies with the essential requirements, which are specified in the directive 2004/108/EC on the approximation of the laws of the Member States relating to electromagnetic compatibility. The product of the declaration described above is in conformity with the requirements of the following specifications

Harmonized standards EN50270:2006, EN61000-4-3:2006

_______________________ Keith Chitty Logistics Manager


Manufactured by Dräger UK LimitedUllswater CloseBlyth Riverside Business ParkBlyth, NorthumberlandNE24 4RG, United KingdomTel. +44 (0)1670 352 891, Fax +44 (0)1670 540 033www.draeger.com

Distributed in the US by Draeger Safety, Inc101 Technology DrivePittsburgh, PA 15275-1057USAPhone +1 412 7 87 - 83 83, Fax +1 412 7 87 - 22 07

23 09 807 - TM4675.892 en© Dräger UK Ltd.Edition 04 - August 2012 Subject to alteration

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