Conductivity - Wenk · PDF fileWTW monitors automatically calculate the corrected conductivity...

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Wissenschaftlich-Technische Werkstätten GmbH & Co. KG · Dr.-Karl-Slevogt-Straße 1 · 82362 Weilheim · Germany · Tel.: +49 (0)881-183-0 · Fax: +49 (0)881-62539

ConductivityOn-LineConductivity

Measurement

Conductivity is a well recognized, andsometimes indispensable, parameter ofstate-of-the-art water, wastewater andindustrial process analysis. Continuousmeasuring systems are employed tomonitor the salt load at the influent ofwastewater treatment plants, to controlquality of drinking water and ultra-purewater or to determine non-specificcontaminants in industrial processes.

For more than 40 years, WTW has beenone of the leading manufacturers ofprecision conductivity measurementsystems, setting new standards withinnovative sensor technology and fullyevolved designs tailored to practicalapplications. WTW products meet themost stringent requirements set byindustry for continuous on-line analysisinstruments.

Measuring ˙ Monitoring ˙ Controlling

Municipal and IndustrialWastewater

Water Treatment

Surface Waters

Sea Water, Brackish Water

Boiler Feed Water

Demineralization

Industrial Process Media

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µS/cm800

700

600

500

300

400

0 10 20 30 40

µS/cm mS/cm0,1 1 10 100 1 10 100 1000

237

Conductivity Measurement

237Wissenschaftlich-Technische Werkstätten GmbH & Co. KG · Dr.-Karl-Slevogt-Straße 1 · 82362 Weilheim · Germany · Tel.: +49 (0)881-183-0 · Fax: +49 (0)881-62539

Electrolytic Conductivity

Temperature Compensation

The conductivity of a solution is critically dependent on temperature. Therefore, theconductivity readings must be referred to a common reference temperature (25°C)for comparability. The term “temperature compensation” is used in the sense of a mathematical conversion; i.e. a measured conductivity (ϑ ) at any giventemperature to the corresponding conductivity value that would be taken at thereference temperature (25°C).

The electrolytic conductivity ofmost aqueous solutions variesmore or less linearly with temperature ϑ . In these cases,a linear correction function tocompensate for the influenceof temperature can be used.For example, the correction coefficient for sewage isapprox. 2%/K.

If a non-linear relationshipexists between temperatureand conductivity, (i.e. the coefficient itself varies with temperature) the relationship can as a rule be describedin terms of a 4th order polynomial.

WTW monitors automatically calculate the corrected conductivity values based onthe selected temperature coefficient. For the compensation of natural water a non-linear function (nLF) (i.e., built-in table for natural water properties) is available.

NEW: IQ SENSOR NET page 254

Conductivity Sensors• TetraCon® (4-electrode cells)

• LR..(2-/4-electrode cells)

Conductivity Monitors • TecnoLine

• EcoLine

• QuadroLine®

Surface Waters

Conductivity Ranges of Aqueous Solutions Electrolytic conductivity as a summation parameter is a measure of the level of ionconcentration of a solution. The more salts, acids or bases are dissociated, the greaterthe conductivity of the solution. In water or wastewater it is mainly a matter of theions of dissolved salts, and consequently the conductivity is an index of the saltload in wastewater or, respectively, the purity of potable water. The measurementof conductivity is also widely used in industrial production, such as process controlin food and pharmaceutical industries.

The measurement of conductivity is generally expressed in S/cm (or mS/cm) whichis the product of the conductance of the test solution and the geometric factor of the measuring cell. The scale for aqueous solutions starts at a conductivity of0.05 µS/cm (at 25 °C) for ultrapure water. Natural water such as drinking water orsurface water is typically in the range of 100 to 1000 µS/cm. The upper end of thescale is reached by some types of alkalis, such as potassium hydroxide solution, atlevels of more than 1000 mS/cm.

Conductivity vs. Temperature Function

Tap Water

Temperature °C

Brackish Water, Sea Water

Industrial Process Water

Concentrated Acids and Alkalis

High-pressure Boiler Feed Water

Demineralization Ion Exchanger

Simple Desalination

Drinking Water

Wastewater

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TetraCon®

Exceptional linearity due to 4-electrode design

Elimination of polarizationeffects

Large measuring rangewith only a single cell

Stable cell constant due toabrasion resistant carbonelectrodes

Integrated temperaturesensor

Optimum cell geometrywithout dead volume

Immersion depth of only30 mm required

Highly resistant to foulingcontaminants

Maintenance friendly, rugged design

FeaturesTetraCon® 700

The TetraCon® 4-electrode cell from WTW is the perfect resultof an application-oriented development. Compared withconventional 2-electrode cells, this advanced design providessubstantially better performance, particularly in the higherconductivity ranges.

TetraCon® 700 conductivity sensors are especially suitable foruse in wastewater treatment plants dealing with highly loadedsewage. Due to the special measuring technique employed,severe influences from primary and secondary polarizationeffects are eliminated, resulting in improved accuracy of thesensor. Provided the devices are installed in accordance withthe manufacturer`s instructions, errors due to the distortionof the current and voltage fields are also avoided.

The special cell geometry of the TetraCon® 700 makes it im-pervious to fouling, and the abrasion resistant carbon electrodesare also easy to clean. The modern epoxy resin encapsulationtechnique used diminishes the likelihood of sensor breakagein harsh industrial environments.

Conductivity Cells

Year WarrantyIP 68 1

TetraCon® 700

239239

Conductivity Cells


WTW Conductivity Sensors

LRD 01316 L stainless steel conductivity cell forinstallation in pipes. Built-in temperaturesensor (130 °C max.), measuring range0.01 to 200 µS/cm, pressure resistant upto 14 bar, 1/2 inch NPT thread.

LRD 325Conductivity measuring cell for installa-tion in pipes. With built-in temperaturesensor (up to 100 °C). Measuring range1 µS/cm to 2 S/cm, pressure resistantup to 10 bar. 1/2 inch NPT thread.

LR 325/01Low-level conductivity cell with flow-thru chamber, integrated temperaturesensor; measuring range 0.001 to300 µS/cm. For use in ultra-pure waterapplications; e.g., boiler feed water.

LR 325/001Like Model LRD 325/01, but with higherresolution; measuring range 0.0001 to30 µS/cm. Sensor is especially designedfor trace measurement in both aqueousand non-aqueous or partially aqueousmedia.

Minimal Distance: 50 mm Minimal Immersion Depth: 30 mm

trodes produce a stable and constant reference potential. The voltage drop atthe current electrodes is regulated via apotentiostat circuit.

The advantage of this technique is thatit eliminates measurementerrors usually caused bypolarization effects whichmost likely build up at higherconductivity levels. Contactresistance problems causedby contaminated electrodesis also largely avoided by thisdesign.

TetraCon® 700Rugged conductivity sensor (4-electrodedesign), with integrated dual thermistor,abrasion resistant carbon electrodes andbreak-proof epoxy body; measuringrange 10 µS/cm to 1000 mS/cm. Submersible sensor assembly speciallydesigned for use in wastewater treat-ment plants.

TetraCon® 3254-electrode conductivity cell with graphiteelectrodes, integral temperature probe;measuring range 1 µS/cm - 2000 mS/cm.Suitable for universal applications.

TetraCon® DU/T4-electrode conductivity cell with integralflow-thru chamber (7 ml volume), built-intemperature sensor; measuring range1 µS/cm to 2000 mS/cm. Recommendedfor standard industrial applications.

The conductivity of a given electrolyte isdetermined by an electro-chemical re-sistance measurement. In its simplestconfiguration, the measuring cell uses twoelectrodes to which an alternating volta-ge is applied. The electric current whichis directly proportional to the free ions inthe electrolyte is measured. The electronicinstrument then calculates the conduc-tivity of the solution, taking into accountthe absolute cell constant of the sensor.

With the TetraCon® 4-electrode design,two separate electrode pairs are usedwhereby the currentless voltage elec-

TetraCon® 4-electrode Design

50 mm

Voltage Electrode 1

Current Electrode 1

Voltage Electrode 2

Current Electrode 2

Temperature Sensor

Voltage and Current FieldTetraCon® 700

30 mm

50 mm

LRD 01 LRD 325

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TetraCon® 700 LRD 01 LRD 325Sensor Type 4-electrode cell 2-electrode cell 4-electrode cell

Measuring Ranges 10 µS/cm ... 1000 mS/cm 0.01 ... 200 µS/cm 1 µS/cm ... 2 S/cm

Cell Constants K = 0.917 cm-1, ±1.5% 0.1 cm-1, ±1.5% 0,475 cm-1, ±1.5%(in free solution)K = 0.933 cm-1, withEBST 700-DU flow-thru adapter

Temperature Sensor Integrated dual NTC Integrated NTC Integrated NTC

Temperature Range 0 °C ... +50 °C, ±0.2 K 0 °C ... +130 °C, ±0.2 K 0 °C ... 100 °C, ±0.2 K

Maximum Pressure 10 bar at 20 °C 14 bar at 20 °C 10 bar at 20 °C

Electrical Cable fitted with 7-pole watertight plug (IP 65)Connection

Certifications CE, GS, CUL, UL

Material Sensor head: PVC Cell body: 316 Ti stainless steel Measuring cell: epoxy/graphiteBody: 316 Ti stainless steel Threaded 1/2 inch NPT Thread:

V4A steel 1.4571Protection rating: IP 68 (NEMA 4X) Protection/Electrode: IP 68 (NEMA 4X) Protection/Electrode head: IP 68

Dimensions 196 x 40 mm 133 x 25 mm 133 x 25 mmLength x Dia. Length x Dia. Length x Dia.

Weight 0.66 kg, approx. 0.35 kg, approx. 0.3 kg, approx.

TetraCon® 325 TetraCon® DU/T LR 325/01 LR 325/001Sensor Type 4-electrode cell 2-electrode cell

Electrode Carbon Carbon 316 Ti stainless steel 316 Ti stainless steel

Measuring Ranges 1 µS/cm ... 2 S/cm 1 µS/cm ... 2 S/cm 0.001 µS/cm ... 0.0001 µS/cm ...300 µS/cm 30 µS/cm

Cell Constant K = 0.475 cm-1 K = 0.778 cm-1 K = 0.1 cm-1 K = 0.01 cm-1

Temperature Sensor Integrated Integrated Integrated Integrated

Flow-thru Measurement No Yes Yes, with additional Yes, with integratedflow chamber D01/T flow chamber

Length 120 mm 155 mm 120 mm 120 mm

Technical Data Conductivity Cells

Conductivity Cells for Special Purposes

241241

Conductivity Cells


Description Order No.

TetraCon® 700-1,5 Submersible conductivity sensor, cable length 1.5 m 302 314

TetraCon® 700-7 Submersible conductivity sensor, cable length 7.0 m 302 316

TetraCon® 700-15 Submersible conductivity sensor, cable length 15.0 m 302 318

TetraCon® 700-SO Submersible conductivity sensor, cable length to be specified 302 319V

LRD 01-1,5 Screw-in conductivity cell, cable length 1.5 m 302 220

LRD 01-3 Screw-in conductivity cell, cable length 3.0 m 302 221


LRD 325-1,5 Screw-in conductivity cell, cable length 1.5 m 302 225



TetraCon® 325 Universal conductivity cell, cable length 1.5 m 301 960

TetraCon® 325-3 Universal conductivity cell, cable length 3.0 m 301 970





TetraCon® DU/T Conductivity cell with flow-thru chamber, without cable 301 252

LR 325/01 Flow-thru conductivity cell, cable length 1.5 m 301 961

LR 325/001 Flow-thru conductivity cell for low level, cable length 1.5 m 301 962

KKDU 325 Connecting cable for TetraCon® DU/T, length 1 m 301 963

AdaptersADA/AMPH-LF Adapter for connection of conductivity cells TetraCon® 700, 303 215

LRD 01 and LRD 325 to LF 296 monitor (see page 249)

ADA/AMPH-LAB-LF Adapter for connection of laboratory conductivity cells or 303 212TetraCon® 325 to LF 170 monitor (see page 249)

ADA/LAB-LF Adapter for connection of laboratory conductivity cells or 303 216TetraCon® 325 to LF 296 monitor (see page 249)

Accessories LRD 01 / LRD 325 (see also Accessories Section)

EST-LRD Stainless steel (1.4571) weld-in socket 1/2" NPT for installation 303 209of LRD 01 and LRD 325 in pipes

ADA-3/4 NPT Threaded bush for adaption 303 201from 1/2" NPT to 3/4" NPT thread

ADA-G 1 Zoll Threaded bush for adaption 303 202from 1/2" NPT to G 1" thread

ADA-LF-DN 20 PVC bonding sleeve with 1/2" NPT inner thread 303 203for installing LRD 01 / LRD 325 in DN 20 plastic pipes

ADA-DN 25 PVC reducing bush for adaption from DN 20 to DN 25 303 204




Ordering Information – Conductivity Cells

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TecnoLine

Lightning protection

Isolated inputs/outputs

Highest electromagneticconformance (EMC)

2 scaleable mAoutputs

4 programmable relays

IP 66 enclosure

RS 485 - interface

PROFIBUS DP gatewayavailable

Automatic temperaturecompensation

2 types of operation:conductivity / salinity

Conductivity checkfunction

Features

Sensor Check FunctionWith a single push-button function, thecalibration of the conductivity systemcan be checked. Using a 0.01 molarpotassium chloride standard solution,recalibration is performed by adjusting

the value of the cell constant. If the cellconstant deviates by more than ± 10%from the stored value, a warning alarmis issued.

TecnoLine LF 171Conductivity Monitor

YearsWarrantyIP 66 2

Conductivity Cell

With the UP/DOWN buttons, the storedcell constant can be changed by ± 10%until the conductivity readout matchesthe theoretical value of the standardsolution.

Measured Conductivity Value of theCalibration Standard

General information

about TecnoLine instruments canbe found on pages 190 – 191

243243

TecnoLine LF 171


Simple Operation

A large liquid crystal display (LCD) with an alphanumeric lineof clear text and dual numeric readout, 6 operation andcontrol keys, and menu-driven prompts and procedures areused to ensure that the instrument can be easily operatedeven by inexperienced personnel.

Min-Max-Avarage Values

The unit stores the daily minimum and maximum conductivityreadings to a non-volatile memory. It also logs the averagevalue, calculated over a preset time interval. This information,together with the date and time of the event, can be recalledfor the previous 4 days.

Conductivity MeasurementCompatible Sensors 4-electrode conductivity cells, TetraCon® 700 or TetraCon® 325

Signal Input Galvanically isolated

Measuring Ranges Autorange mode or manually selectable:0.0 ... 199.9 µS/cm 0.00 .... 19.99 mS/cm0 ... 1999 µS/cm 0.0 ... 199.9 mS/cm

Resolution 0.1 µS/cm to 0.1 mS/cm (depending on measuring range)

Accuracy ±2% of measured value, ±1 digit (for range ≤ 50 µS/cm)±0.5% of measured value, ±1 digit (for range ≥ 50 µS/cm)

Span of Cell Constant 0.45 cm-1 ... 1.3 cm-1 (variable)

Reference Temperature 20 °C or 25 °C), user-selectable

Measuring Range / Salinity 0.0 ... 70.0; resolution 0.1 (reference temperature 15 °C)

Temperature Measurement -5...+50 °C

Temperature Accuracy ±0.2 K, ±1 digit

Temperature Compensation Linear temperature coefficient: 0.5 to 3.0%/K (adjustable)Non-linear function “nLF” for natural waters, according to EN 27888

Display Alphanumeric line, 12 characters with 5 x 8 dot matrix; Dual numeric LCD-readout, 3 1/2 digits for values and display of units; Graphic symbols for auxiliary readout information

Relay Outputs 1 dedicated sensor alarm relay (sensor failure), 4 programmable relays (setpoints, delay, hysteresis, timer function) 1; Relays are form C rated 500 mA @ 24 VAC/VDC resistive

Analog Outputs Two isolated 0/4 - 20 mA outputs for conductivity and temperature, max. load 600 Ω, basic accuracy 0.1%; Output span and recorder damping adjustable by software

Digital Output RS-485 serial interface; allows communication bus with up to 31 devices 2Ambient Conditions Operating temperature: -25 ... +55°C

Storage temperature: -25 ... +65°CClimate class 4 (VDI/VDE 3540)

Electrical Connections Sensor input: 7-pole AMP-socket, IP 66 rated Signal inputs/outputs, mains supply: via internal plug-in terminal strips

Input Power 115/230 VAC (-15/+10%), switchable50 ... 60 Hz, power consumption 13 ... 20 VA (depending on version)

Transient Voltage Protection Built-in lightning protection circuit (inputs and outputs); Coarse protection: 90 V / 5 kA (8/20 µsec); fine protection: 600 VA max.

EMI/RFI Conformance According to EN 61 236 class B, Annex A, FCC class ANamur recommendations (enhanced specifications)

Certifications CE, GS, CUL, UL (pending)

Enclosure Watertight housing (PC/GF20) , 7-pole threaded receptacle for sensor, 4 cable feed-through connections(PG compression fittings Ø 10-14 mm), Protection rating: IP 66 (exceeds NEMA 4X)

Dimensions 222 x 202 x 105 mm, W x H x D

Weight 3.8 kg, approx.

1 R-version 2 RS-version

Technical Data TecnoLine LF 171

Description Order No.

LLF 171 Conductivity monitor with 2 isolated 0(4) - 20 mA outputs 300 940

LF 171 R Same as Model LF 171, with 4 additional relay outputs 300 942

LF 171 RS Same as Model LF 171, with additional RS 485 interface 300 941

LF 171 R/RS Same as Model LF 171, with 4 additional relay outputs and RS 485 serial interface 300 943

Ordering Information – TecnoLine LF 171

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General information

about EcoLine instruments canbe found on pages 192 – 193


EcoLineLF 170

Features

Conductivity Monitor

Maximum OperatingReliabilty

On-line analysis systems, particularlyprocess instruments, are subject to everincreasing requirements in terms ofoperating safety. In its EcoLine Series,WTW has taken full account of this byincorporating extensive electronicprotection circuitry. An integrated coarseand fine lightning protection, extremeEMI and RFI immunity, and galvanicallyisolated inputs and outputs are someof the safety features which result inmaximum reliabilty and confidence inoperation of the LF 170 monitor.

Programmable RelayFunctions

The two control/alarm relays can beconfigured by the user as either NC orNO contacts. Any relay can also beassigned a special function, (e.g. as alimit monitor), the relevant functionalparameters being defined in a sub-menu.When a control mode for a relay isselected, the upper or lower setpoint isentered, followed by the hysteresis(deadband) and the delay time. The

variable hysteresis defines a symmetricaltolerance band around the limit valuewhich the measured value must exceedor fall below respectively for the relayoutput to trigger.

User Friendly Operation

A clear and simple menu structure guidesusers through the programming, set-upprocedure, and general operation of themonitor. The instrument software,therfore, is arranged in three hierarchicalprogram levels.

For ease of operation, measurement andcalibration mode are selected via twopush-buttons on the keypad. For custo-mizing of the instrument, the user canchoose either of two program levels. InCON level the basic configuration ofthe instrument is defined; i.e., definitionof operational functions that suit theapplication. Operating and functionalparameters are entered in PAR level.

A security code protects the two proce-dural program levels from unauthorizedaccess. To prevent operator error, aforced guide through the programsequence is predefined.



Enhanced electromagneticconformance (EMC)

24 VAC/VDC options available

2 programmable Relays

IP 66 enclosure

RS 485 - interface


2 scaleable mA outputs

Compatible with2- or 4-electrode conductivity cells

7 measuring ranges

4 fixed cell constants plus variable setting from 0.09 to 1.5 cm-1


Built-in timer for connecting a cleaning system



EcoLine LF 170

Conductivity MeasurementCompatible Sensors 2-electrode or 4-electrode conductivity cells


Measuring Ranges 0.000 ... 1.999 µS/cm (0.01 cm-1); 0.000 .... 1.999 mS/cm (0.1 cm-1, 1 cm-1)(Cell Constants) 0.00 ... 19.99 µS/cm (0.01 cm-1, 0.1 cm-1); 0.00 ... 19.99 mS/cm (1 cm-1)

0.0 ... 199.9 µS/cm (0.1 cm-1, 1 cm-1); 0.0 ... 199.9 mS/cm (1 cm-1, 10 cm-1)0 ... 1000 mS/cm (10 cm-1)

Resolution 0.001 µS/cm to 1 mS/cm (depending on measuring range)

Accuracy ±0.5% of measured value, ±1 digit

Span of Cell Constant 0.09 cm-1 to 1.5 cm-1 (variable)

Reference Temperature 20 °C or 25 °C, user-selectable


Temperature Measurement -5...+130 °C; depending on temperature sensor


Temperature Compensation Linear temperature coefficient: 0.5 to 3.0%/K (adjustable)Non-linear function “nLF” for natural waters, according to EN 27888

Display Dual numeric LCD-readout, 3 1/2 digits for values and display of units;Graphic symbols for auxiliary information and operator guidance

Relay Outputs 1 dedicated sensor alarm, 2 programmable relays (limit values, hysteresis) 1Relays are form C rated 5A at 230 VAC, max. 5A @ 30 VDC resistive

Analog Outputs Isolated 0/4 - 20 mA outputs for conductivity and 2 for °C (600 Ω max. load); Output span and recorder damping adjustable via software.

Serial interface RS 485 interface, bus operation with up to 31 instruments possible 3Ambient Conditions Operating temperature: -25 ... +55 °C

Storage temperature: -25 ... +65 °CClimate class 4 (VDI/VDE 3540)

Electrical Connections Sensor input: 7-pole AMP-socket, IP66 rating Signal inputs and outputs, mains supply: via internal plug-in terminal strips

Input Power 115/230 VAC (-15/+10%), 48 to 62 Hz (18 VA max.) 24 VAC (-15/+10%), 24 VDC (-30/+20%)

Transient Voltage Protection Built-in lightning protection circuit (inputs and outputs); Coarse protection: 90 V / 1.5 kA (8/20 µsec); fine protection: 600 VA max.



Enclosure Watertight housing (PC/GF20) , 7-pole threaded receptacle for sensor, 4 cable feed-through connections (PG compression fittings Ø 10-14 mm); Protection rating: IP66 (exceeds NEMA 4X)


Weight 3.5 kg, approx.

1 R-version 2 T-version 3 RS-version

Technical Data EcoLine LF 170

Standard Instrument / Options Order No.

LF 170 Standard: without relay outputs 38Option: with 2 programmable relays

Standard: 1 analog output for Option: 2 analog outputs for and temperature

Standard: without RS 485 interfaceOption: with RS 485 interface

Standard: 230 V, 50/60 HzOption: 115 V, 50/60 Hz

24 VAC, 50/60 Hz24 VDC

LF 170 Please choose one of each category and complete the order number accordingly. 38

LF 170 Example: EcoLine LF 170 with 2 programmable relays, 382 analog outputs, with RS 485 interface, 115 V version

Ordering Information – EcoLine LF 170

22 2 1

2

1

2

1

2

1

1

2

3

R

R

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RS

T RS

115

230

115

24AC

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RS 485

RS 232

GNDb

aba ba ba


QuadroLine®LF 296

Features

Conductivity Monitor



Enhanced electromagneticconformance (EMC)

7 selectable measuringranges

2 programmable Relays

96 x 96 mm format forpanel mounting

RS 485 - interface


24 VAC / VDC versions

Connection of measuringcells with 2- or 4-electrode technique

2 scaleable mA outputs

4 fixed cell constants and variable setting from 0.09 to 1.5 cm-1


Built-in timer forconnecting a cleaningsystem

Measuring Ranges and CellConstants

With fixed and variable cell constantsettings, and a choice of 7 measuringranges, the LF 296 monitor provides ahigh degree of flexibility. Through it,this panel mount unit is suitable for abroad range of applications from ultra-pure water, to sewage, to specializedindustrial measurements.

Programmable RelayFunctions

The two control/alarm relays can beconfigured by the user as either NC orNO contacts. Any relay can also beassigned a special function, (e.g. as alimit monitor), the relevant functionalparameters being defined in a sub-menu.When a control mode for a relay isselected, the upper or lower setpoint isentered, followed by the hysteresis(deadband) and the delay time.

The variable hysteresis defines a symmet-rical tolerance band around the limitvalue which the measured value mustexceed or fall below respectively for therelay output to trigger.

RS 485 Serial Interface

By means of the RS 485 serial interfaceup to 31 monitors of the QuadroLine®

Series can be linked to a host computeror a work station via a common bussystem. For the physical connection ofthe units, three-wire technology (diffe-rential signals a/b and equipotentialbonding) is recommended, as thisfacilitates reliable data transmission evenover long distances.

In a Master/Slave operation mode theinstruments (slaves) are controlled bythe host computer (master) via theirindividual bus addresses; a communica-tion protocol is not included with theinterface.

Integration with a higher level PROFIBUS-DP network can be accomplished usinga special gateway.


RS 485 Converter

COMDevice 1

Device 2Device 3

Twisted Pair

General information

about QuadroLine® instrumentscan be found on pages 194 – 195

247

QuadroLine® LF 296


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Conductivity MeasurementCompatible Sensors 2-electrode or 4-electrode conductivity cells


Measuring Ranges 0.000 ... 1.999 µS/cm (0.01 cm-1); 0.000 .... 1.999 mS/cm (0.1 cm-1, 1 cm-1)(Cell Constants) 0.00 ... 19.99 µS/cm (0.01 cm-1, 0.1 cm-1); 0.00 ... 19.99 mS/cm (1 cm-1)

0.0 ... 199.9 µS/cm (0.1 cm-1, 1 cm-1); 0.0 ... 199.9 mS/cm (1 cm-1, 10 cm-1)0 ... 1000 mS/cm (10 cm-1)

Resolution 0.001 µS/cm to 1 mS/cm (depending on measuring range)

Accuracy ±0.5% of measured value, ±1 digit

Span of Cell Constant 0.09 cm-1 to 1.5 cm-1 (variable)

Reference Temperature 20 °C or 25 °C, user-selectable


Temperature Measurement -5...+130 °C, depending on temperature sensor


Temperature Compensation Linear temperature coefficient: 0.5 to 3.0%/K (adjustable);Non-linear function “nLF“ for natural waters, according to EN 27888

Display Dual numeric LCD-readout, 3 1/2 digits for values and display of unitsGraphic symbols for auxiliary information and operator guidance

Relay Outputs 1 dedicated sensor alarm, 2 programmable relays (limit values, hysteresis) 1Relays are form C rated 5A at 230 VAC, max. 5A @ 30 VDC resistive

Analog Outputs Two isolated 0/4 - 20 mA outputs for conductivity and 2 for temperature;600 Ω max. resistive load; Output span and recorder damping adjustable via software.

Digital Output RS 485 serial interface; allows communication bus with up to 31 devices 3Ambient Conditions Operating temperature: - 25 ... +55 °C

Storage temperature: - 25 ... +65 °CClimate class 4 (VDI/VDE 3540)

Electrical Connections Sensor input, signal inputs and outputs, mains supply: via internal plug-in terminal strips; accessible from rear side

Input Power 115/230 VAC (-15/+10%), 48 to 62 Hz (18 VA max.) 24 VAC (-15/+10%), 24 VDC (-30/+20%)

Transient Voltage Built-in lightning protection circuit (inputs and outputs). Protection Coarse protection: 90 V / 1.5 kA (8/20 µsec); fine protection: 600 VA max.



Enclosure Fiberglass-reinforced Noryl casing with membrane keypad (Polyester); Protection rating: IP 54 (front panel)


Weight 1 kg, approx.

1 R-version 2 T-version 3 RS-version

Technical Data QuadroLine® LF 296

Standard Instrument / Options Order No.

LF 296 Standard: without relay outputs 39Option: with 2 programmable relays

Standard: 1 analog output for Option: 2 analog outputs for and temperature

Standard: without RS 485 interfaceOption: with RS 485 interface

Standard: 230 V, 50/60 HzOption: 115 V, 50/60 Hz

24 VAC, 50/60 Hz24 VDC

LF 296 Please choose one of each category and complete the order number accordingly. 39

LF 296 Example: QuadroLine® LF 296 with 2 programmable relays, 392 analog outputs, with RS 485 interface, 115 V version

Ordering Information QuadroLine® LF 296

R

R

T

T RS

RS

230

115

115

24AC

24DC

2

1

2 2 2 1

2

1

2

1

2

1

3

4

248


TetraCon®

700

LRD 01

LRD 325

LR 325/01

LR325/001

TetraCon®

325

TetraCon®

DU/T

LF 170 Field Monitor

2 Relay Outputs*mA/Temp.*RS 485*0.000..1.999 µS/cm (0.01cm-1; var)0.00..19.99 µS/cm (0.01cm-1;0.1cm-1; var)0.0..199.9 µS/cm (0.1cm-1;1cm-1; var)0.000..1.999 mS/cm (0.1cm-1;1cm-1; var)0.00..19.99 mS/cm (1 cm-1; var)0.0..199.9 mS/cm (1 cm-1,10 cm-1; var)0..1000 mS/cm (10 cm-1; var)var: 0.09..1.5 cm-1

230 VAC115 VAC *24 VAC *24 VDC *

Water/WastewaterUsable Meauring Range:0.0..199.0 µS/cm 0.000..1.999 mS/cm0.00..19.99 mS/cm 0.0..199.9 mS/cm0...+50 °C

Boiler Feed Water/Ion ExchangerIn-line Measurements, PipeworkMounting 1/2 “ NPT ThreadUseful Measuring Ranges:0.00..19.99 µS/cm 0.0..199.9 µS/cm0 .. 130 °C; 14 bar at 20 °C

Large Usable Measuring Range In-Line Application/Installation in Pipes1/2" (3/4" Adapter) NPT Thread0.0..199.0 µS/cm0..1999 µS/cm0.00..19.99 mS/cm0.0..199.9 mS/cm(MR: 0.0..199.9 mS/cmup to 110.0 mS/cm at 50 °C)0..+100 °C; 10 bar at 20 °C

Boiler Feed Water/Ion ExchangerConductivity Cell with Flow-thruChamberUseful Measuring Ranges:0.00..19.99 µS/cm0.0..199.9 µS/cm0.000..0.300 mS/cm 0...+50 °C

Boiler Feed Water/Ion ExchangerConductivity Cell with Flow-thruChamber, Trace MeasurementsUseful Measuring Ranges:0.000..1.999 µS/cm 0.00..19.99 µS/cm0...+50 °C

General Application / WaterLarge Measuring Range0.00..19.99 µS/cm 0.0..199.9 µS/cm0.000..1.999 mS/cm0.00..19.99 mS/cm0.0..199.9 mS/cm (0..25 °C)0...+50 °C(MR: 0.0..199.9 mS/cm; up to 110.0 mS/cm at 50 °C)

Flow-thru CellUsable Measuring Range:0.00..19.99 µS/cm0.0..199.9 µS/cm0.000..1.999 mS/cm 0.00..19.99 mS/cm0.0..199.9 mS/cm0...+50 °C

LF 296 Panel Mount Monitor

2 Relay Outputs*mA/Temp.*RS 485*0.000..1.999 µS/cm (0.01cm-1; var)0.00..19.99 µS/cm (0.01cm-1;0.1cm-1;var)0.0..199.9 µS/cm (0.1cm-1;1cm-1; var)0.000..1.999 mS/cm (0.1cm-1;1cm-1; var)0.00..19.99 mS/cm (1 cm-1; var)0.0..199.9 mS/cm (1 cm-1,10 cm-1; var)0..1000 mS/cm (10 cm-1; var)var: 0.09..1.5 cm-1

230 VAC115 VAC *24 VAC *24 VDC *

Water/WastewaterUsable Meauring Range:0.0..199.0 µS/cm 0.000..1.999 mS/cm0.00..19.99 mS/cm 0.0..199.9 mS/cm0...+50 °C

Boiler Feed Water/Ion ExchangerIn-line Measurements, PipeworkMounting 1/2 “ NPT ThreadUseful Measuring Ranges:0.00..19.99 µS/cm 0.0..199.9 µS/cm0 .. 130 °C; 14 bar at 20 °C

In-Line Application / Installation in Pipes 1/2" (3/4" Adapter) NPT Thread0.0..199.0 µS/cm0..1999 µS/cm0.00..19.99 mS/cm0.0..199.9 mS/cm(MR: 0.0..199.9 mS/cmup to 110.0 mS/cm at 50 °C)0..+100 °C; 10 bar at 20 °C

Boiler Feed Water/Ion ExchangerConductivity Cell with Flow-thruChamberUseful Measuring Ranges:0.00..19.99 µS/cm0.0..199.9 µS/cm0.000..0.300 mS/cm 0...+50 °C

Boiler Feed Water/Ion ExchangerConductivity Cell with Flow-thruChamber, Trace MeasurementsUseful Measuring Ranges:0.000..1.999 µS/cm 0.00..19.99 µS/cm0...+50 °C

General Application / WaterLarge Measuring Range0.00..19.99 µS/cm 0.0..199.9 µS/cm0.000..1.999 mS/cm0.00..19.99 mS/cm0.0..199.9 mS/cm (0..25 °C)0...+50 °C(MR: 0.0..199.9 mS/cm; up to 110.0 mS/cm at 50 °C)

Flow-thru CellUsable Measuring Range:0.00..19.99 µS/cm0.0..199.9 µS/cm0.000..1.999 mS/cm 0.00..19.99 mS/cm0.0..199.9 mS/cm 0...+50 °C

Features

Measuring Range/Cell Constants

1.: 10 µS/cm..1000 mS/cm2.: K=0.917 cm-1

3.: 4-electrode cell4.: NTC 5.: 0...+50 °C6.: 10 bar7.: IP 68 (electrode)

1.: 0.01..200 µS/cm2.: K=0.1 cm-1

3.: 2-electrode cell 4.: NTC5.: 0...+130 °C6.: 14 bar at 20 °C7.: IP 68 (electrode)

1.: 1 µS/cm..2 S/cm2.: K=0.475 cm-1

3.: 4-electrode cell4.: NTC5.: 0..+100 °C6.: 10 bar7.: IP 68 (electrode)

1.: 0.001..300 µS/cm2.: K=0.1 cm-1

3.: 2-electrode cell4.: NTC5.: 0...+50 °C6.: 2 bar7.: IP 68 (electrode)

1.: 0.0001..30 µS/cm2.: K=0.01 cm-1


1.: 0.0001..30 µS/cm2.: K=0.475 cm-1


1.: 1 µS/cm..2 S/cm2.: K=0.778 cm-1


1. Measuring Ranges2. Cell Constants3. Probe Type4. Temperature Compensation5. Temperature Range6. Pressure Range7. Protection Rating

* Options – N.A. Not Applicable

LF 171 Field Monitor

4 Relay Outputs*mA/Temp. (Standard)RS 485*0.0..199.0 µS/cm (var)0..1999 µS/cm (var)0.00..19.99 mS/cm (var)0.0..199.9 mS/cm (var)

var: 0.450..1.300

115/230 VACswitch-selectable

Water/WastewaterUsable Meauring Range:0.0..199.0 µS/cm 0..1999 µS/cm 0.00..19.99 mS/cm 0.0..199.9 mS/cm 0...+50 °C

–

General Application / WaterLarge Usable Measuring Range In-Line Application/Installation in Pipes1/2" (3/4" Adapter) NPT Thread0.0..199.0 µS/cm0..1999 µS/cm0.00..19.99 mS/cm0.0..199.9 mS/cm(MR: 0.0..199.9 mS/cmup to 110.0 mS/cm at 50 °C)0..+100 °C; 10 bar at 20 °C

–

–

General Application / WaterLarge Measuring Range0.0..199.0 µS/cm0..1999 µS/cm 0.00..19.99 mS/cm 0.0..199.9 mS/cm 0...+50 °C(MR: 0.0..199.9 mS/cm;up to 110.0 mS/cm at 50 °C)

Flow-thru CellUsable Measuring Range:0.00..19.99 µS/cm0.0..199.9 µS/cm0.000..1.999 mS/cm 0.00..19.99 mS/cm0.0..199.9 mS/cm 0...+50 °C

249249

System Configurations


AdapterADA/AMPH-LF

LR 325/01LR 325/001TetraCon® 325TetraCon® DU/T with KKDU 325

TetraCon® DU/TH with KKDU 325

AdapterADA/AMPH-Lab-LF

TetraCon® 700LRD 01LRD 325

QuadroLine® LF 296AdapterADA/LAB-LF

LR 325/01LR 325/001TetraCon® 325TetraCon® DU/T with KKDU 325

TetraCon® DU/TH with KKDU 325

TecnoLine LF 171

EcoLine LF 170

TetraCon® 700LRD 325

TetraCon® 700LRD 01LRD 325

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Conductivity - Wenk · PDF fileWTW monitors automatically calculate the corrected conductivity...

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Transcript of Conductivity - Wenk · PDF fileWTW monitors automatically calculate the corrected conductivity...