IIR-FREON II - Relevant Solutionsinteccontrols.com/ums/obsolete/_IIR-FREON-II_UserManual.pdf ·...

IIR-FREON II

FREON GAS

TRANSMITTER/SENSOR

INSTALLATION

OPERATION AND MAINTENANCE

MANUAL

INTEC Controls, Inc. 9730 Distribution Ave., San Diego, CA 92121 Phone: (858) 578-7887 Fax: (858) 578-4633

www.inteccontrols.com email – [email protected]

IIR FREO N II O p e r a t i o n And Ma i nt e na nce Ma nua l

IIR-FREO N II O p e r a t i o n Ma nua l Ma r ch 0 3 , 2 0 0 8

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Table Of Contents

READ BEFORE OPERATING1 ...................................................................................................................12

1. 0 GENERAL INFORMATION1 .............................................................................................................12

1.1 0 PRINCIPLE OF OPERATION0 ..................................................................................................................02 1.2 0 KEY FEATURES0 ..................................................................................................................................03 1.3 0 APPLICATIONS0....................................................................................................................................03 1.4 0 SPECIFICATIONS0 .................................................................................................................................04

2. 0 INSTALLATION1 .................................................................................................................................15

2.1 0 SENSOR LOCATION.............................................................................................................................05 2.2 0 PHYSICAL DIMENSIONS0......................................................................................................................05 2.3 0 GAS SAMPLING0 ..................................................................................................................................06 2.4 0 MOUNTING AND SYSTEM WIRING0 ......................................................................................................06

2.4.1 0 Terminalsc......................................................................................................................................c7 2.4.2 0 Power Supply................................................................................................................................c7 2.4.3 0 Wire and Cablec.............................................................................................................................c8 2.4.4 0 Digital Connectionc .......................................................................................................................c8 2.4.5 0 RS-485 Terminatorc.......................................................................................................................c8 2.4.6 0 RS-485 Driver Replacementc.........................................................................................................c9 2.4.7 0 Isolated 4-20mA Analog Outputc...................................................................................................c9

3. 0 FUNCTION AND CONFIGURATION1 ...........................................................................................11

3.1 0 IIR-FREON II WORKING MODE0......................................................................................................011 3.2 0 SYSTEM INITIALIZATION0...................................................................................................................011 3.3 KEYS AND POTS ...............................................................................................................................12 3.4 STATUS LED....................................................................................................................................13 3.5 RS-485 INDICATORS ........................................................................................................................13 3.6 RS-485 ADDRESSING .......................................................................................................................14

4. GAS CALIBRATION........................................................................................................................15

4.1 CAL GAS CONCENTRATION............................................................................................................15 4.2 EQUIPMENT REQUIRED.....................................................................................................................16 4.3 ZEROING CALIBRATION ....................................................................................................................16 4.4 SPAN CALIBRATION..........................................................................................................................17

5. MAINTENANCE...............................................................................................................................18

5.1 CAL MA MODE AND POT CAL........................................................................................................18 5.2 DVM CONNECTION .........................................................................................................................18 5.3 4MA OUTPUT CALIBRATION ............................................................................................................18 5.4 20MA OUTPUT CALIBRATION ..........................................................................................................19 5.5 FACTORY POT CALIBRATION............................................................................................................19

6. TROUBLESHOOTING ....................................................................................................................20



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READ BEFORE OPERATING

All 0 individuals 0 who 0 have 0 or 0 will 0 have 0 the 0 responsibility 0 of 0 using, 0 maintaining, 0 or

servicing 0 this 0 product 0 must 0 carefully 0 read 0 this 0 manual. 0 The 0 product 0 will 0 perform 0 as

designed 0 only 0 if 0 it 0 is 0 used, 0 maintained, 0 and 0 serviced 0 in 0 accordance 0 with 0 the

manufacturer’s instructions.

1. CGeneral Information

1.1 g Principle of Operation

The 0IIR-FREON 0II 0Smart 0Sensor 0 is 0a 0microprocessor 0controlled 0FREON 0gas 0Sensor 0or

Transmitter using infrared sensing technology. The concentration of Freon is measured by

determining the amount of absorption of light in a specific frequency band.

As 0most 0gases 0have 0their 0characteristic 0spectra 0in 0the 0infrared. 0Those 0spectra 0derive 0from

the 0molecule's 0composition 0in 0such 0a 0way 0that 0no 0two 0molecular 0gases 0have 0the 0same 0IR

spectrum. 0IR 0spectra 0are 0 the 0fingerprints 0of 0gases, 0and 0 thus 0allow 0gases 0 to 0be 0uniquely

identified.

By 0 transmitting 0 a 0 beam 0 of 0 IR 0 radiation 0 through 0 the 0 air, 0 or 0 through 0any 0particular 0gas

volume, and recording how much is transmitted at selected spectral lines, one may decide

which 0 gases 0 are 0 present 0 and 0 how 0 much 0 of 0 each. 0 This 0 is 0 a 0 standard 0 and 0 well-proven

principle, 0routinely 0used 0in 0laboratory 0analyses 0of 0chemical 0species, 0and 0is 0also 0the 0basis

on which our sensors are made.

An 0 IR 0 detector 0 is 0 essentially 0 a 0 temperature 0 sensor 0 and 0 is, 0 therefore, 0 potentially 0 very

sensitive 0to 0changes 0in 0the 0ambient 0temperature. 0However, 0our 0IIR-Freon 0II 0smart 0sensor

modules 0 do 0 it 0 better, 0 faster, 0 and 0 more 0 precisely. 0 The 0 IIR-FREON 0 II 0 smart 0 sensors 0 are

entirely electronic with no moving parts, and are built around our unique QT Gas Sample

Cell with constant temperature control integrated with IR Source and IR Detector

together. This makes our IR smart sensors work from -45°C to 65°C without being

susceptible to ambient temperature fluctuations.



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Comparing 0with 0conventional 0gas 0detector, 0gases 0to 0be 0detected 0are 0often 0corrosive 0and

reactive. 0With 0most 0sensor 0 types, 0 the 0sensor 0 itself 0 is 0directly 0exposed 0 to 0 the 0gas, 0often

causing 0 the 0 sensor 0 to 0 drift 0 or 0 die 0 prematurely. 0 The 0 main 0 advantage 0 of 0 IR 0 sensor 0 or

transmitter 0 is 0 that 0 the 0detector 0does 0not 0directly 0 interact 0with 0 the 0gas 0 (or 0gases) 0 to 0be

detected. 0In 0the 0IIR-Freon 0II 0Smart 0Sensor, 0the 0major 0functional 0components 0are 0protected

with 0optical 0parts. 0In 0other 0words, 0gas 0molecules 0interact 0only 0with 0a 0light 0beam. 0The 0IR

Source 0 and 0 IR 0 Detector 0 can 0 be 0 treated, 0 making 0 them 0 resistant 0 to 0 corrosion, 0 and 0 are

designed such that they are easily removable for maintenance or replacement.

1.2 g Key Features

• Infrared Sensing Technology

• Constant Temperature QT Gas Sampling Cell

• Standard RS-485 Output with OptoMux protocol

• Standard Isolated 4-20mA Analog Output

• Diffusion Sampling module

• No moving parts in diffusion model

• Water and corrosion resistant PVC enclosure NEMA 4, 4X

• Addressable from 0 to 31

• Calibration Buttons and Remote Calibration Available

• Operation at 20–28VDC or 20–28VAC

• Status/Error LED, TX/RX LED, IR-Source LED, 4-20mA Status LED

• CSA/UL approval (pending)

1.3 g Applications

The IIR-FREON II is designed to monitor for the loss of refrigerant gas in a variety of

applications:

• Mechanical equipment rooms

• Propellant filling operations

• Solvent cleaning stations

• Cold storage and transport facilities

• Meat packing plants

• Supermarkets and refrigerant storage locations

• Other specialty applications using halocarbons



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1.4 g Specifications

Input Power: 0 24VDC nominal, range 20 to 28VDC

24VAC nominal, range 20 to 28VAC

0

Fuse: 0 F1 on Main Board: Polyswitch 1.6A

F1 on Power Board: 2A Very Fast-Acting Fuse

Littelfuse: Axial Lead and Cartridge Fuse

Part Number: 0251002

Sensor: Infrared Freon

Gas Detected: R134a, R123, R22, R11

R12, R13, R14, R21, R23, R31, R32, R41, R113, R114,

R115, R116, R125, R143a, R152, R161 …

Range: 0 to 100ppm for R123; 0 to 1000ppm for others

Accuracy: ±3% of reading

Repeatability: ±1% of full scale

Sampling: Diffusion

Output Signal: RS-485 with OptoMux protocol

• Available Controller: M-Controller

Q4 Controller

Isolated 4-20mA Analog Signal

Enclosure Rating: IP 66 & NEMA 4, 4X, 12 & 13

Cover Screws should be torqued to 2.5lbs-in (30cN-m)

Operating Temperature: -45°C to 65°C

Ambient Humidity: 5% to 95% RH (non-condensing)

Storage Temperature: -45°C to 70°C

Size: 200mm X 120mm X 90mm

Weight: Less than 1.5lbs (0.680 kg)



85050-101-000 Rev A 5

2. Installation

2.1 Sensor Location

Several factors should be considered when selecting locations to install sensors. The

following general suggestions should be considered to assure the detection of the target

gas. Select the most suitable location for each sensor.

1. Air Currents: If there are fans, winds, or others sources of air movement, gases may

tend to rise or collect in certain areas of a facility. The local air currents should be

assessed to aid in selecting the sensor location. In outdoor situations considerations such

as prevailing winds should be accounted for. Air convection can often be more important

in determining gas concentrated areas than factors of Vapor Density.

2. Vapor Density: R11, R22, R123 and R134a are heaver than air. Detecting location

should be 9 - 18 inch (0.23m to 0.46m) above the floor.

3. Gas Emission Sources: As a rule, at least one sensor should be located in close

proximity to each point where a leak is likely to occur. This is particularly important

when a liquid having a low volatility is monitored.

4. Environmental Factors: Designed to rugged outdoor use consider the following in

selecting locations. Install sensors where they will be protected from wind, dust, snow,

water, vibration and shock.

2.2 Physical Dimensions



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2.3 g Gas Sampling

The 0 IIR 0 FREON 0 II 0 gas 0 sampling 0 system 0 is 0 composed 0 of 0 a 0 diffusion 0 type 0 gas 0 sample

chamber 0and 0two 0vent 0holes. 0The 0gas 0flows 0in 0and 0out 0through 0the 0two 0vent 0plugs 0on 0the

bottom of the IIR-FREON II enclosure. See above picture.

2.4 g Mounting and System Wiring

NOTE: 1The 1Diffusion 1version 1IIR-FREON 1II 1smart 1sensor 1should 1be 1mounted 1 1foot

(30cm) from the floor.



85050-101-000 Rev A 7

2.4.1 Terminals

Power Board Terminals

2.4.2 Power Supply

NOTICE: Installing or using this equipment in a manner not specified by the

manufacturer could cause electric shock, bodily injury, or risk of fire.

Power Supply:

Voltage: ~ 24 ± 4 VAC 50/60Hz 1.0A AC Total max.

24 ± 4 VDC 1.0A DC Total max.

Note: AC Power must be non-grounded (floating).

Note: No external over-current protection is required. Over-current protection is

provided by means of fuses F1.

Fuse F1: 2A Very Fast-Acting Fuse and Must be CSA/UL approved

Littelfuse: Axial Lead and Cartridge Fuse

Part Number: 02510002.



85050-101-000 Rev A 8

2.4.3 Wire and Cable

The terminal block plug TB1 accepts 12 AWG to 24 AWG wire, Use 16 AWG or 18

AWG wire for Power Supply in long wiring runs, which can be up to 1km (1,000 meters)

long.

We recommend using BELDEN 9841 for communications. This wire has 120 ohm input

impendence, which will eliminate RS-485 communication problems.

2.4.4 Digital Connection

2.4.5 RS-485 Terminator

The terminator on each end of the RS485 loop is designed to match the electrical

impedance characteristic of the twisted pair loop, and will prevent signal echoes from

corrupting the data on the line. The terminator should be enabled on BOTH ends of the

RS485 loop. Short and medium length modbus/485 loops can operate without the

terminating resistor. Longer runs may require the terminating resistors. But adding

terminator dramatically increases power consumption.



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Factory default setting is disabled terminator.

The IIR-FREON II smart sensor supplies this resistor on the main board, and it is chosen

using a jumper at J6.

J6 1-2: Terminator Disabled / OFF (default)

J6 2-3: Terminator Enabled / ON

2.4.6 1 RS-485 Driver Replacement

RS-485 0 lines 0 in 0 heavy 0 industrial 0 environments 0 are 0 sometimes 0 subjected 0 to 0 magnetic

disturbances 0 causing 0 sufficient 0 inducted 0 power 0 surges 0 to 0 damage 0 the 0driver 0 integrated

circuit 0(IC). 0This 0IC 0U14 0is 0socketed 0on 0the 0circuit 0card 0for 0ease 0of 0replacement 0in 0the

field.

2.4.7 1 Isolated 4-20mA Analog Output

IIR-FREON 0II 0can 0provide 0one 0channel 0 isolated 04-20 0milliamp 0analog 0outputs 0with 1no

need for separate power supply. The maximum output impedance is 600 ohms. The

minimum isolation voltage is 1000 Vrms.



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Connection 0Indicator 0will 0be 0 turned 0on 0when 04-20mA 0 loops 0are 0connected 0and 0will 0be

turned off if the 4-20mA loops are open.

Test 0point 0SIG+ 0and 0SIG- 0are 0used 0to 0measure 0the 0current 0online 0when 0the 0IIR-FREON 0II

is working in the field.

The 0module 0can 0also 0be 0used 0to 0output 02-10VDC 0if 0the 0Jump 0J2 02-3 0is 0connected. 0The

default setting: J2 1-2 is connected that mean the output is 4-20mA analog output.

IIR-FREON 0II 0outputs 04mA 0or 02VDC 0at 0ppm, 0outputs 020mA 0or 010VDC 0at 0Full 0Scale.

For 0example, 0for 0R123, 0it 0outputs 020mA 0at 0100ppm, 0for 0R134a, 0R22 0and 0R11, 0it 0outputs

20mA at 1000ppm. The IIR-FREON II will draw a straight line between.

If there is any fault found in IIR-FREON II, it will output 2.5mA to indicate the fault.



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3. C Function and Configuration

3.1 g IIR-Freon Working ModeIIR-FREON II has four kinds of working mode:

• Warm-up Mode:

It allows IIR-FREON II to heat up Optical Block and initialize components

• Monitoring Mode: SW1 position 6 is switched OFF.

It allows IIR-FREON II to measure the gas concentration and output signals.

• Calibrate mA Mode: SW1 position 6 is switched ON

It allows IIR-FREON II to calibrate 4mA and 20 mA outputs.

• Adjust mA Mode: A key is pressed and hold when in Calibrate mA Mode

It allows IIR-FREON II to adjust 4mA and 20 mA outputs.

3.2 g System Initialization

When the IIR-FREON II smart sensor is turned on, it initializes hardware and software. As

the 0transmitter 0is 0warming 0up, 0the 0optical 0block 0is 0heated 0to 0a 0constant 0temperature, 0the

status 0 LED 0 blinks 0 at 0 50% 0 duty 0 ON 0 which 0 indicates 0 the 0 transmitter 0 is 0 in 0 warming-up

procedure.

In 0 warming-up 0 procedure, 0 the 0 reading 0 of 0 the 0 transmitter 0 will 0 always 0 be 0 zero 0 and 0 the

analog 0 output 0 will 0 always 0 be 0 4mA. 0 M-Controller 0 and 0 Q4 0 Controller 0 will 0 display

“Warming 0up” 0in 0their 0LCD 0display 0panel. 0The 0time 0for 0warming-up 0procedure 0depends

on 0 the 0ambient 0 temperature. 0The 0 lower 0 the 0ambient 0 temperature 0 is, 0 the 0 longer 0 it 0 takes.

Normally, it takes 5 minutes during the warming-up procedure.

After 0 warming-up 0 procedure, 0 the 0 transmitter 0 automatically 0 starts 0 testing 0 for 0 errors. 0 If

there are no errors, the Status LED is turned ON constantly. If there is an error, the Status

LED 0blinks 0once 0every 0second 0and 0the 04-20mA 0analog 0outputs 02.5mA. 0An 0error 0message

will display on the M-Controller or Q4 Controller panel.

NOTE: 1If 1the 1Status 1LED 1blinks 1twice 1every 1second, 1check 1SW1 1position 16, 1make

sure the position 6 is switched OFF, which makes the IIR-FREON II work in Normal

Monitoring Mode, rather than in Cal mA Mode.

When the transmitter is powered up, the IR Source LED on Lamp Board blinks all the

time. If the IR Source LED is always ON or OFF, that means the IR Source in the optical

block has problem or the driver for the IR Source has problem. Refer to Section 5:

Troubleshooting for IR Source.



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3.3 g Keys and Pots

IIR-FREON II has two keys and two pots on main board.

• Key SW3 is named “Zeroing CAL”, “CAL 4mA” and “-”

• Key SW2 is named “Span CAL”, “CAL 20mA” and “+”

• Pot W1 is named “ZERO POT”

• Port W2 is named “CAL POT”

The two keys perform different functions in different working mode:

• In Monitoring Mode: The two keys are used as Zeroing CAL and Span CAL.

o When key “Zeroing CAL” is pressed, it will perform zeroing calibration.

o When key “Span CAL” is pressed, it will perform span calibration.

• In CAL mA Mode: The two keys are used to calibrate 4mA and 20mA output.

o When key “CAL 4mA” is pressed, it will output 4mA or 2VDC.

o When key “CAL 20mA” is pressed, it will output 20mA or 10VDC.

o When key “CAL 4mA” is pressed and held for 3 seconds, it will enter Adjust

4mA Mode.

o When key “CAL 20mA” is pressed and held for 3 seconds, it will enter Adjust

20mA Mode.

• In Adjust mA Mode: The two keys are used to adjust 4mA and 20mA output.

o When key “-” is pressed, it will decrease the output signal.

o When key “+” is pressed, it will increase the output signal.

• In Warm-up Mode: The two keys cannot be used as Zeroing CAL and Span CAL,

but they can be used for calibrating 4-20mA output.

The two pots are used to adjust zeroing gain and calibration gain when the unit is in the

factory calibration procedure. Do not attempt to modify or adjust the two pots in the

field.



85050-101-000 Rev A 13

3.4 Status LED

The Status LED indicates the status of the transmitter is running:

• Always ON: Normal monitoring mode

• Blink once every second: Fault report

• Blink twice every second: Cal mA Mode

• Blink 50% duty on: Warming up mode or Adjust mA Mode

3.5 RS-485 Indicators

When the transmitter is connected to a M-Controller or Q4 Controller, the traffic of the

communication can be monitored visually through the two RS-485 indicators, one is RX

LED, which indicates the data stream received in the transmitter. The other is TX LED,

which indicates the data stream out from the transmitter.

If the TX LED or the RX LED is always ON, that means the communication has problem.

Refer to Section 5: Troubleshooting for RS-485.



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3.6 g RS-485 Addressing

M-Controller supports RS-485 addressing from 0 to 31 for digital sensor.

Q4 Controller supports RS-485 addressing from 0 to 3 for digital sensor.

The 0IIR-FREON 0II 0smart 0sensor 0RS-485 0address 0can 0be 0defined 0from 0 0 to 031 0by 0using

DIPSWITCH 0SW1 0position 01 0to 05. 0Position 06 0is 0used 0to 0define 0CAL 0Gas 0concentration

for Span Calibration.

3 4

ON

17 2 5 6

ADDRESS7 CAL 4-20mA

ON: 1

OFF: 0

SW1

Default Address: 1

ADDRESS 25

ADDRESS 17

ADDRESS 9

ADDRESS 1

ADDRESS 24

17 2 37 4 57 6 17 2

ONON

ADDRESS 16

ADDRESS 8

ON

17 2

ON

17 2

37 4 57 6

ON

17 2

37 4 57 6

ON

17 2

ADDRESS 0

ON

17 2

ON

37 4 57 6 17 2

ADDRESS 29

ADDRESS 21

ADDRESS 13

ADDRESS 5

ADDRESS 27ADDRESS 26

37 47 57 6 17 2 5437 6 17 2

ADDRESS 28

37 47 57 6 17 2 37 4 57 6 17 2

ADDRESS 19

ADDRESS 11

ADDRESS 3

ONON

ADDRESS 18

ADDRESS 10

37 4 65

ON

17 2

37 4 57 6

ON

17 2

543 6

ON

17 2

537 4 6

ON

17 2

ADDRESS 2

ON

37 47 57 6 17 2

ON

537 4 6 17 2

ONON

ADDRESS 20

ADDRESS 12

37 4 57 6

ON

17 2

37 4 57 6

ON

17 2

37 4 65

ON

17 2

37 4 57 6

ON

17 2

ADDRESS 4

ON

37 4 57 6 17 2

ON

37 4 57 6 17 2

ADDRESS 31ADDRESS 30

35437 67 1 2 547 6 17 27 537 47 6

ADDRESS 23

ADDRESS 15

ADDRESS 7

ADDRESS 22

3

ADDRESS 14

3

5437 6

ON

1 2

537 4 6

ON

1 2

547 6

ON

17 2

54 6

ON

17 2

ADDRESS 6

3

ON

543 6

ON

1 2

ON

54 6

ON

17 2

5437 6

537 4 6

537 4 6

IIR-FREON II Address SW1 Setting



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4. CGas Calibration

Calibration 0 should 0not 0vary 0significantly 0over 0a 0period 0of 0years; 0however, 0 it 0 is 0best 0 to

perform 0a 0verification 0calibration 0after 0 installation, 0and 0at 0one-year 0 intervals 0 thereafter.

All units are factory calibrated.

The 0IIR-FREON 0II 0smart 0sensor 0is 0calibrated 0using 0a 0two-point 0calibration 0process. 0First,

use 0a 0“Zero 0Gas”, 0then 0use 0a 0“CAL 0Gas” 0containing 0a 0known 0concentration 0of 0a 0standard

reference gas, to set the second point of reference.

4.1 g CAL GAS Concentration

The IIR-FREON II uses full scale as its CAL GAS concentration:

Basically, IIR-FREON II full scale for all Freon gases is 1000ppm except for R123, which

is 100ppm.

Gas Type Full Scale Cal Gas Concentration

R134a 1000ppm 1000ppm

R123 100ppm 100ppm

R22 1000ppm 1000ppm

R11 1000ppm 1000ppm

Others 1000ppm 1000ppm



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4.2 g Equipment Required

• A cylinder of Zero Gas, (clean air or nitrogen).

• A cylinder of Cal Gas

• Flow Limiting Regulator(s) 0.4 to 0.6 lpm for Diffusion Version

• Tubing and calibration adapter.

4.3 g Zeroing Calibration

Note: Zeroing Calibration must be performed before Span Calibration.

Note: 1 Make 1 sure 1 SW1 1 position 1 6 1 is 1 OFF, 1 that 1 means 1 the 1 IIR-FREON 1 II 1 is 1 in

Monitoring Mode, rather than in CAL mA Mode.

1. 0 For Diffusion Version:

• Open the enclosure of the IIR-FREON II smart sensor

• Connect the zero gas supply tubing to the push-in fitting on the optical block

2. Turn on the gas flow.

3. Waiting for about 3 minutes or the reading on Controller panel is stable or 4-20mA

Analog Signal Output is stable

4. Push and hold the button “Zero / Cal 4mA” for one second, and then release the

button, the Status LED will blink for 15 to 30 seconds and then be constant ON; the

zero calibration data is saved.

5. If the Status LED is constantly blinking, that means something is wrong in the

Zeroing procedure, repeat procedure 4 to try again, if the Status LED continue

blinking, the unit needs to be repaired in factory, otherwise, Zeroing Calibration has

succeeded, go to procedure 6.

6. Turn off the gas flow and remove it.



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4.4 g Span Calibration

1. 0 For Diffusion Version:

• Open the enclosure of the IIR-FREON II smart sensor

• Connect the cal gas supply tubing to the push-in fitting on the optical block

2. 0 Turn on the gas flow.

3. 0 Waiting 0for 0about 03 0minutes 0or 0the 0reading 0on 0Controller 0panel 0is 0stable 0or 04-20mA

Analog Signal Output is stable

4. 0 Push 0 and 0 hold 0 the 0 button 0 “CAL 0 / 0 Cal 0 20mA” 0 for 0 1 0 second, 0 and 0 then 0 release 0 the

button, 0the 0Status 0LED 0will 0blink 0for 015 0to 030 0seconds 0and 0then 0be 0constant 0ON, 0that

means the IIR-FREON II sensitivity is acceptable; the span calibration data is saved.

5. 0 If 0the 0Status 0LED 0is 0constantly 0blinking, 0that 0means 0the 0IIR-FREON 0II 0sensitivity 0is

unacceptable. Repeat procedure 4 to try again, if the Status LED continue blinking, it

may be necessary to clean or replace the Optical Block Assembly, the unit needs to be

repaired in the factory.

6. Turn off the gas flow and remove it.



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5. CMaintenance

5.1 g CAL mA Mode and Pot CAL

CAL 0mA 0Mode 0and 0Port 0CAL 0are 0used 0during 0factory 0calibration 0and 0should 0not 0require

recalibration in the field. Do not attempt to modify these settings in the field.

Changing these values will change the analog output signal scale.

Warning: 1 This 1procedure 1is 1part 1of 1factory 1setup. 1In 1most 1circumstances 1it 1will

not 1 be 1 necessary 1 to 1 perform 1 this 1 procedure 1 in 1 the 1 field. 1 These

functions require the use of precision reference instrumentation.

5.2 g DVM Connection

• IIR-FREON II is Offline: o Switch DVM to measure DC current, plug the probe “-“ into IGND and

plug the probe “+” into SIG-. The LED D6 will be constant ON.

• IIR-FREON II is Online: o Switch DVM to measure DC current, plug the probe “-“ into SIG - and

plug the probe “+” into SIG +. The LED D6 will be short and turned OFF.

5.3 g 4mA Output Calibration

3 4

ON

17 2 5 6

ADDRESS7 CAL 4-20mA

ON: 1

OFF: 0

SW1

Default Address: 1

• SW1 position 6 can force IIR-FREON II into CAL mA Mode

o ON position: Calibrate 4 or 20mA Mode

o OFF position: Normal Monitoring Mode

Calibrate 4mA Output procedure:

1. 0 Switch SW1 position 6 to ON

2. 0 Status-LED will Flash Twice, that means the IIR-Freon II is in Cal 4-20mA Mode



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3. 0 Without key press, the DVM reading is the real time current output

4. 0 Press key [4mA CAL] shortly, it outputs 4mA for verify


6. 0 Press and hold key [4mA CAL] for 3 second, or till the Status-LED is flash at

50% duty, that means the 4mA can be adjusted now.

7. 0 Press [4mA CAL] to reduce the output; Press [20mA] to increase the output;

8. 0 Adjust the output to 4.00 to 4.05mA

9. 0 Switch SW1 position 6 back to OFF, then the settings will be accepted and saved

in IIR-Freon II. 10. If there is no key pressed for 60 seconds before the SW1 position 6 is switched

back to OFF, the IIR-Freon will exit 4mA adjust mode and return to step 4.

5.4 g 20mA Output Calibration

Calibrate 20mA Output procedure:

1. 0 Switch SW1 position 6 to ON

2. 0 Status-LED will Flash Twice, that means the IIR-Freon II is in Cal 4-20mA Mode

3. 0 Without key press, the DVM reading is the real time current output



6. 0 Press and hold key [20mA CAL] for 3 second, or till the Status-LED is flash at

50% duty, that means the 20mA can be adjusted now.

7. 0 Press [4mA CAL] to reduce the output; Press [20mA] to increase the output;

8. 0 Adjust the output to 20.00 to 20.05mA

9. 0 Switch SW1 position 6 back to OFF, that means the settings will be accepted and

saved in IIR-Freon II. 10. If there is no key pressed for 60 seconds before the SW1 position 6 is switched

back to OFF, the IIR-Freon will exit 20mA adjust mode and return to step 4.

5.5 Factory Pot Calibration

• Switch DVM to measure DC Voltage, plug the probe “-“ into AGND on Main Board

and plug the probe “+” into TP3 on Main Board.

• Apply Zero Gas, Slowly adjust ZERO POT to make the output of TP3 at 1.235V ±

0.025V.

• Apply CAL Gas, Slowly adjust CAL POT to make the output of TP3 at 4.500V ±

0.050V. (For R123, the TP3 is 2.500V ± 0.050V)

• Perform Gas Calibration again by pressing the two calibration keys.



85050-101-000 Rev A 20

6. Troubleshooting

This troubleshooting guide is intended as an aid in identifying the cause of unexpected

behavior and determining whether the behavior is due to normal operation or an internal

or external problem.

SYMPTOMS PROBABLE CAUSE SUGGESTED SOLUTION

RS-485

RX LED or

TX LED constantly ON

• RS-485 bus connection has

problem

• RS-485 Driver U14 is damaged

• Controller side RS-485 Driver

has problem

• Disconnect the Cable to isolate

the problem

• Replace U14 IC on main board

• Replace RS-485 Driver in

Controller

Status LED is blinking on

50% duty

• In Warming up process

• Temperature sensor broken

• Heater is broken

• Wait for the block to warm up

• Check IR Detector Assembly


Status LED is blinking once

every second

• Temperature Sensor Fault

• IR Source or Lamp Dirty

• Gas Sample Cell Dirty

• Signal Fault

• Lamp Short/Open

• Calibrating Error

• Other Error


• Return to Factory



• Check IR Source Assembly

• Recalibration or Check Gas

Flow or Use different calibration

gas or Replace weak IR Source

Assembly or Replace Broken IR

Detector Assembly


IR Source LED is constant

ON or OFF, not blinking

• Main Board has problem

• Heater is short/Open

• Check Firmware and Driver

• Check IR Source Assembly

Reading abnormally high or

low or jumping around

randomly

• Dirty Sensor Block

• Excessive moisture

• Weak IR Source

• Temperature Sensor Loose


• Add filter to gas inlet

• Replace IR Source Assembly


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