Oldham iTrans User Manual

USER MANUAL

iTrans

FIXED POINT SINGLE OR DUAL

GAS MONITOR WITH DUAL

ANALOG OUTPUTS

Part Number: 77023554-1
Version: 16.0
Release Date: April 20, 2016

The Fixed Gas Detection Experts

FIXED POINT SINGLE OR DUAL GAS MONITOR WITH DUAL

ANALOG OUTPUTS

Copyright © 2016 by Oldham S.A.S
All rights reserved. No reproduction of all or part of this document, in any form, is

permitted without the written consent of Oldham S.A.S.

is a trademark of Oldham.
ModBus® is a registered trademark of Schneider Automation Inc.
ModBus® protocol™ is a trademark of Schneider Automation Inc.
All other trademarks and registered trademarks are the property of their respective

owners.
All of the information that is provided in this document is accurate to the best of

our knowledge.
As a result of continuous research and development, the specifications of this

product may be changed without prior notice.

Oldham S.A.S
Rue Orfila
Z.I. Est – CS 20417
F–62027 ARRAS Cedex
Tel.: [phone]
Fax: [phone]

ii iTrans User Manual (P/N: 77023554-1)

Warnings and Cautionary Statements

CAUTION: Failure to perform certain procedures or note certain conditions may
impair the performance of the monitor. For maximum safety and performance,
please read and follow the procedures and conditions outlined below.

 Oxygen deficient atmospheres may cause combustible gas readings that use

catalytic LEL sensors to be lower than actual concentrations.

 Oxygen enriched atmospheres may cause combustible gas readings that use

catalytic LEL sensors to be higher than actual concentrations.

 Calibrate the catalytic combustible gas sensor after each incident where the

combustible gas content causes the instrument to enter in the OVER-RANGE
alarm condition.

 Silicone compound vapors may affect the catalytic combustible gas sensor and

cause readings of combustible gas to be lower than actual gas concentrations. If
the sensor has been used in an area where silicone vapors were present, always
calibrate the instrument before continued use to ensure accurate measurements.

 Sensor openings must be kept clean. Obstruction of the sensor openings may

cause readings to be lower than actual gas concentrations.

 Sudden changes in atmospheric pressure may cause temporary fluctuations in

the oxygen readings.

 Alarms relays are non-latching.
 When connecting 4-20 mA outputs to inductive loads, Oldham recommends

using an isolation barrier in line with the 4-20 mA signal.

 Interior grounding terminal is to be used for grounding, the exterior terminal is

only to be used for bonding

 iTrans Stand-Alone versions with on-board visible alarm are to be

installed in ordinary locations only; however, remote sensors can be
installed in hazardous locations (Gas dependent. Read Agency
Approvals paragraph).

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CALIBRATION ALERT: Gas detection instruments are potential life-saving
devices. Recognizing this fact, calibration for the toxic and catalytic LEL sensors
should be at least at quarterly intervals, while the infrared sensor should be
calibrated on an annual basis with function test every 6 months.

Further, Oldham recommends prudent testing and/or includes calibration after a
gas alarm. All calibration service to sensors should be recorded and accessible.

CAUTION: For safety reasons, this equipment must be operated and serviced by
qualified personnel only.

iv iTrans User Manual (P/N: 77023554-1)

iTrans Fixed Point Single/Dual Gas Monitor Table of Contents

Table of Contents

CHAPTER 1: INTRODUCTION

1.1. Overview of the Gas Monitor ............................................................................1-1

1.2. Specifications .........................................................................................................................1-1

1.3. Agency Approvals - CSA .......................................................................................................1-3

1.4. Special Instructions for Safe Use (EU) ..................................................................................1-5

CHAPTER 2: HARDWARE OVERVIEW

2.1. Main Electronics Unit (Housing) ...........................................................................................2-1

2.2. Sensor .....................................................................................................................................2-2

2.3. Display ....................................................................................................................................2-3

2.4. Inputs – Intrusive and Non-Intrusive ......................................................................................2-3

2.5. Electronics Modules ...............................................................................................................2-4

CHAPTER 3: INSTALLATION

3.1. Introduction ............................................................................................................................3-1

3.2. Installation Considerations .....................................................................................................3-1

3.3. Wall Mounting........................................................................................................................3-1

3.4. Column Mounting ..................................................................................................................3-1

CHAPTER 4: SYSTEM WIRING

4.1. Introduction ............................................................................................................................4-1

4.2. Wiring Preparation .................................................................................................................4-1

4.3. Alarm Relay Wiring (J1, J5, and J6) ......................................................................................4-2

4.4. Power and Output Wiring (J1) ...............................................................................................4-3

4.5. Sensor Wiring (J3) ..................................................................................................................4-4

4.6. Digital ModBus RTU Interface Wiring (J1) ..........................................................................4-9

4.6.1. ModBus Interface Wiring Overview..........................................................................4-9

4.6.2. Setting the ModBus Address on the ......................................................4-9

4.6.3. Setting the ModBus Address for Stand-Alone Sensors ...........................................4-10

4.7. Wiring Conclusion................................................................................................................4-12

CHAPTER 5: OPERATION

5.1. Initial Start-up .........................................................................................................................5-1

5.2. Warm-up Period .....................................................................................................................5-1

5.3. Normal Operating Mode.........................................................................................................5-2

5.4. Programming Mode Overview ...............................................................................................5-3

5.5. Programming Mode – Non-intrusive Operation .....................................................................5-4

5.5.1. Introduction ................................................................................................................5-4

5.5.2. Sensor Type ...............................................................................................................5-5

5.5.3. Zeroing .......................................................................................................................5-5

5.5.4. Calibration ..................................................................................................................5-6

5.5.5. Changing Span Gas Concentration ............................................................................5-7

5.5.6. Sensor Span Reserve ..................................................................................................5-8

5.6. Programming Mode – Push Button Operation .......................................................................5-8

5.6.1. Introduction ................................................................................................................5-8

5.6.2. Entering Programming Mode and Selecting a Channel .............................................5-9

5.6.3. Set Low Alarm .........................................................................................................5-10

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Table of Contents iTrans Fixed Point Single/Dual Gas Monitor

5.6.4. Set High Alarm ........................................................................................................5-10

5.6.5. 4-20 mA Analog Output Range ...............................................................................5-10

5.6.6. Set System Time – Minute .......................................................................................5-11

5.6.7. Set System Time – Hour ..........................................................................................5-11

5.6.8. Set System Time – Date ...........................................................................................5-12

5.6.9. Set System Time – Month ........................................................................................5-12

5.6.10. Set System Time – Year ..........................................................................................5-13

5.6.11. Zeroing ....................................................................................................................5-13

5.6.12. Calibration ...............................................................................................................5-14

5.6.13. Changing Span Gas Concentration ..........................................................................5-15

5.6.14. Sensor Span Reserve ................................................................................................5-16

5.6. Special Notes on Using Broadband Infrared (BBIR) Sensors ..............................................5-17

CHAPTER 6: MODBUS INTERFACE

6.1. Introduction ............................................................................................................................6-1

6.2. Sample Gas Reading via ModBus Network ...........................................................................6-1

6.3. ModBus Register List ............................................................................................6-2

6.4. ModBus Resources .................................................................................................................6-6

6.5. Termination ............................................................................................................................6-6

CHAPTER 7: MAINTENANCE

7.1. Introduction ............................................................................................................................7-1

7.2. Sensor Replacement ...............................................................................................................7-2

7.3. Zero and Calibration ...............................................................................................................7-2

CHAPTER 8: TROUBLESHOOTING

8.1. Introduction ............................................................................................................................8-1

8.2. Diagnosing Common Problems ..............................................................................................8-1

8.3. Fault Codes .............................................................................................................................8-2

8.4. Function Codes .......................................................................................................................8-3

CHAPTER 9: WARRANTY

9.1. Warranty .................................................................................................................................9-1

9.2. Limitation of Liability ............................................................................................................9-1

APPENDIX A: ACRONYMS AND ABBREVIATIONS
APPENDIX B: DECIMAL, BINARY, AND HEXADECIMAL EQUIVALENTS
APPENDIX C: ORDERING MATRIX
APPENDIX D: FACTORY DEFAULT SETTINGS
APPENDIX E: EU DECLARATION OF CONFORMITY CERTIFICATE
APPENDIX F: INDEX

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vi iTrans User Manual (P/N: 77023554-1)

iTrans Fixed Point Single/Dual Gas Monitor Introduction

INTRODUCTION

Chapter

1

The fixed gas monitor is an
independent monitor capable of
displaying one or two gas
concentrations as well as sensor or
instrument comes standard with
independent 4-20 mA outputs for each
channel, making it ideal for interfacing
to control units. A digital ModBus
RTU interface is also available,
allowing the to interface to
digital control systems. The
is available with an optional relay
board, allowing the unit to directly
control external devices such as fans,
pumps, alarm horns, or warning lights.
Two of the relays can be programmed
for alarm activation, while the third
relay is a fault protection relay.

Figure 1-1. Typical Gas

Monitor with Single Gas Sensor

(Stainless Steel Option)

1.1. Overview of the Gas Monitor

Calibration, changing span gas concentration, and checking the instrument’s
configuration are easily accomplished using the non-intrusive magnetic wand.

The is powered with a 24 VDC (12-28 VDC) power supply and
provides a 4-20 mA control signal for each sensor.

1.2. Specifications

Specifications for the gas monitor are listed in Table 1-1.

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Introduction iTrans Fixed Point Single/Dual Gas Monitor

Item

Description

Enclosure

Cast aluminum, poly-bonded coating or 316 stainless steel. Both are
explosion-proof, NEMA 4X, IP66 rated.

Dimensions

5.0  6.0  5.0 inches (127  153  129 mm)

Sensors

Combustible Gases: Catalytic bead and/or Non-Dispersive Infrared
(NDIR)

Oxygen/Toxic Gases: Electrochemical diffusion

Input Voltage

12-28 VDC operating range (24 VDC typical), 350 mA (nominal)
Maximum current draw of 600 mA with 2 LEL sensors installed

Input Current
(Max)

Toxic Gas/Oxygen

150 mA @ 24 VDC (single gas)

Combustible Gases
(Catalytic)

175 mA @ 24 VDC, 0.6 A peak (single gas)

Combustible Gases
(Infrared)

150 mA @ 24 VDC, 0.6 A peak (single gas)

Combined
Catalytic/Infrared

280 mA @ 24 VDC (two gas)

Display

Dual-channel split-screen LED display (4-digit, 7-segment
arrangement per channel) provides simultaneous display of one or two
gases.

Signal
Outputs

Digital

ModBus RTU: RS485 digital communication with
ModBus RTU software protocol system at 9600 baud.
Three- or four-wire system accommodates over 200
devices in bus configuration. Address selection through
on-board 8-position DIP switch. NOTE: ModBus is not
to be used for CSA C22.2 No. 152 compliance.

Analog

4-20 mA (linear analog)

Alarm Relays
Quantity

3 alarm relays: Two user-programmable relays, SPST,
N.O.; plus one fault relay, SPST, N.C.

Contact
Capacity

5A @ 30 VDC
5A @ 30 VAC

Temperature
Range

-40º C ~ +75º C (-40º F ~ +167º F)

-20º C ~ +50º C (-4º F ~ +122º F) for BBIR only

Humidity
Range

10% - 90% RH (non-condensing), typical
Pressure

Atmospheric pressure 10%

Table 1-1. Specifications for the Monitor

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iTrans Fixed Point Single/Dual Gas Monitor Introduction

Sensor

Gas

Range/Resolution

Combustible Gases

LEL

0 -100% LEL in 1% increments

Hydrogen

H2

0 - 999 ppm in 1 ppm increments

Oxygen

O2

0 - 30.0% by vol. in 0.1% increments

Ammonia

NH3

0 - 500 ppm in 1 ppm increments

Carbon Monoxide

CO

0 - 999 ppm in 1 ppm increments

Carbon Monoxide/H2 Null

CO

0 - 999 ppm in 1 ppm increments

Hydrogen Sulfide

H2S

0 - 500 ppm in 1 ppm increments

Sulfur Dioxide

SO2

0.2 - 99.9 ppm in 0.1 ppm increments

Hydrogen Cyanide

HCN

0.2 – 30.0 ppm in 0.1 ppm increments

Hydrogen Chloride

HCl

0.2 - 30.0 ppm in 0.1 ppm increments

Phosphine

PH3

0 - 1.00 ppm in 0.01 ppm increments

Nitrogen Dioxide

NO2

0.2 - 99.9 ppm in 0.1 ppm increments

Nitric Oxide

NO

0 - 999 ppm in 1 ppm increments

Chlorine

Cl2

0.2 - 99.9 ppm in 0.1 ppm increments

Chlorine Dioxide

ClO2

0.02 - 1.00 ppm in 0.01 ppm increments

Table 1-2. Sensor Ranges

1.3. Agency Approvals

The is certified by CSA, a NRTL laboratory, to the following US and
Canadian Standards.

 UL Std No. 916-Energy Management Equipment
 UL Std No. 1203-Explosion-Proof and Dust-Ignition-Proof

o Electrical Equipment for Use in Hazardous (Classified) Locations

 UL Std No. 1604-Division 2 Hazardous Location Electrical Equipment
 ISA S12.13 Part I-2000-Performance Requirements, Combustible Gas

Detectors (catalytic sensors only)

 CSA Std C22.2 No.30-M1986-Explosion-Proof Enclosures for Use in

Class I Hazardous Locations

 CSA Std C22.2 No.142-M1987-Process Control Equipment

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Introduction iTrans Fixed Point Single/Dual Gas Monitor

 CSA Std C22.2 No. 152-M1984-Combustible Gas Detection Instruments

(catalytic sensors only)

 CSA Std C22.2 No. 213-M1987-Non-incendive Electrical Equipment for

Use in Class I, Division 2 Hazardous Locations

Marking: Transmitter Class I, Div 1, Groups B, C, D – AEx d IIB + H2 T5

Sensor

Ambient for Model 7701-5857 Fixed IR sensor (BBIR) is -20C to +55C. Ambient for all other devices is

-40C to +75C.

(gas dependent)

(1)

Class I, Div 1, Groups B, C, D – AEx d IIB + H2 T5

(2)

Class I, Div 2, Groups A, B, C, D – AEx d IIB + H2 T5

The is certified under the IECEx scheme to:

IEC 60079-0:2007 - Electrical apparatus for potentially explosive
atmospheres–General requirements.

 IEC 60079-1:2003 - Electrical apparatus for potentially explosive

atmospheres–Flameproof enclosures ‘d’.

 IEC 60079-15:2005 - Electrical apparatus for explosive gas atmospheres.

Type of protection "n".

Marking: Transmitter Ex d IIB+H2 T5; IP66; Ta (-40°C to +75°C)

Sensor

(gas dependent)

(1)

Ex d IIB+H2 T5 ; IP66 ; Ta (-40°C to +75°C)

(2)

Ex nA II T5; Ta (-40°C to +75°C)

The complies with relevant provisions, per listed standards, of European
ATEX Directive 94/9/EC and EMC Directive 89/336/EEC, amended by Directives
92/31/EEC and 93/68/EEC, and is constructed with reference to published
standards of Directive 72/23/EEC, to eliminate electrical risks and fulfill 1.2.7 of
Annex II of Directive 94/9/EC.

 EN 60079-0:2004 - Electrical apparatus for potentially explosive

atmospheres – General requirements.

 EN 60079-1:2004 - Electrical apparatus for potentially explosive

atmospheres – Flameproof enclosures ‘d’.

 EN 60079-15:2003 - Electrical apparatus for explosive gas atmospheres.

Type of protection “n”.

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iTrans Fixed Point Single/Dual Gas Monitor Introduction

 EN 50270: Electromagnetic compatibility - Electrical apparatus for the

detection and measurement of combustible gases, toxic gases or oxygen (for
Type 2 [Industrial] Apparatus).



The EC type examination certificate is KEMA 04 ATEX 2216X, with
Marking code: Transmitter Ex d IIB+H2 T5; Ta (-40°C to +75°C)

Sensor

(gas dependent)

(1)

Ex d IIB+H2 T5 ; Ta (-40°C to +75°C)

(2)

Ex nA II T5; Ta (-40°C to +75°C)

(1)

LEL, H2, O2, CO, H2S, SO2, HCN, PH3, NO2, NO, CO2

(2)

Cl2, HCl, NH3, ClO2

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Introduction iTrans Fixed Point Single/Dual Gas Monitor

1.4. Special Instructions for Safe Use (EU)

 Cable connection: The cable entry device shall be of a certified flameproof

type, suitable for the conditions of use and correctly installed.

 Conduit Connection: An Ex d certified sealing device, such as, a conduit

seal with setting compound, suitable for the conditions of use, and correctly
installed, shall be provided immediately to the entrance of the housing.

 Unused openings: Unused openings shall be closed with suitable Ex d

certified closing elements.

 Dual Onboard: The “Y” adapter parts used to assemble dual onboard

configurations do not have Atex approval. Consult factory for dual onboard
Atex options.

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1-6 iTrans User Manual (P/N: 77023554-1)

iTrans Fixed Point Single/Dual Gas Monitor Introduction

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iTrans Fixed Point Single/Dual Gas Monitor Hardware Overview

HARDWARE OVERVIEW

Chapter

2

2.1. Main Electronics Unit (Housing)

The body is a cast aluminum housing that contains the electronics of the
gas monitor. Details of a single-gas housing are shown in Figure 2-1.

Figure 2-1. Details of a Single-Gas Gas Monitor

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NOTE: Dimensions are in inches.

Hardware Overview iTrans Fixed Point Single/Dual Gas Monitor

Item

Descriptions

Catalytic and Toxics

Infrared (BBIR)

Sensor
Housing
Material

Aluminum, Anodized
Explosion-proof: Class I, Divisions 1

and 2, Groups B, C, D and Ex d IIB
+H2 T5 (ATEX and IECEx), Ex d

IICT6 Gb (China)

Stainless Steel
Explosion-proof: Class I,

Divisions 1 and 2 Groups B,
C, D, and Ex d IIB +H2 T4
(Europe), Ex d IIC T4 or IIC

T6 (China)

Aluminum, Anodized w/Gore-Tex
Membrane: Class I, Division 2, Groups
A, B, C, D and Ex nA IIC T5 (IECEx)
and Ex nA II T5 (ATEX).

Dimensions

3.0  3.0 inches (76  76 mm)

3.5  3.0 inches (89  76 mm)

Accuracy

<  3% Toxic and Oxygen

<  5% Combustibles

Protection
Class

IP 66 or NEMA4X

2.2. Sensor
Table 2-3. Sensor Specifications

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iTrans Fixed Point Single/Dual Gas Monitor Hardware Overview

2.3. Display

The gas monitor has a 4-digit, 7-segment LED display for each of 2
channels. A dual-gas sensor and sample display are shown in
Figure 2-2.

Figure 2-2. The Display (Dual-Gas Monitor Shown)

2.4. Inputs – Intrusive and Non-Intrusive

The gas monitor can be configured using intrusive and non-intrusive
means. Both methods of configuration are accomplished through physical inputs
that are visible behind the glass panel of the gas monitor.

A set of four keys are used when intrusive programming is appropriate (i.e., when
the enclosure can be removed and when the keys can be manually pressed). These
keys are the mode, increment (+), decrement (-), and enter keys. Refer to
Figure 2-3.

For applications that require non-intrusive manipulation, two magnetically­activated reed switches are used to accomplish programming without removing the
cover. A magnetic wand is positioned over the appropriate reed switch (above the
glass face plate) without the wand physically touching the reed switches. The
locations of the reed switches are shown in Figure 2-3.

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Hardware Overview iTrans Fixed Point Single/Dual Gas Monitor

Figure 2-3. Locations of Input Keys and Reed Switches

Programming the gas monitor in both intrusive and non-intrusive modes
is explained in detail in Chapter 5: Operation.

2.5. Electronics Modules

The electronics module of the gas monitor contains connectors and
jumpers for wiring and configuring the device. The electronics module for a main

unit is shown in Figure 2-4. The electronics module for a remote unit is
shown in Figure 2-5. Wiring details are explained in Chapter 4: System Wiring.

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iTrans Fixed Point Single/Dual Gas Monitor Hardware Overview

Figure 2-4. Electronics Module for (Main Unit)

Figure 2-5. Electronics Board for Remote Sensor

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Hardware Overview iTrans Fixed Point Single/Dual Gas Monitor

2-6 iTrans User Manual (P/N: 77023554-1)

iTrans Fixed Point Single/Dual Gas Monitor Installation

INSTALLATION

Chapter

3

3.1. Introduction

The can be mounted in one of two ways. The unit can be wall-mounted
using the wall mounting holes in the enclosure, or it can be mounted onto a column
using U-bolts. Each of these options is discussed in this chapter. Be sure to
review the installation considerations before mounting the gas monitor.

3.2. Installation Considerations

Regardless of the installation type (wall mounting or column mounting), the

should be installed at or near the location of a possible leak or the source
of emissions. Installation height depends on the density of the gas being monitored.
Moreover, speed and direction of air flow, and relative position to potential leaking
points should also be considered.

IMPORTANT: The gas monitor must not be installed on vibrating or
heat generating sources.

3.3. Wall Mounting

If your application is best addressed using a wall-mounted gas monitor, then use
the four 8 mm mounting holes in the enclosure to secure the to an appropriate
location on the wall. Refer to Figure 3-1.

3.4. Column Mounting

If your application is best addressed using a column-mounted gas monitor, then use
the four 8 mm mounting holes and two U-bolts to secure the to an appropriately
located segment of a target pipe or conduit. Refer to Figure 3-2.

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Installation iTrans Fixed Point Single/Dual Gas Monitor

Figure 3-1. Mounting the Gas Monitor on a Wall

Figure 3-2. Mounting the Gas Monitor on a Column Using U-Bolts

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3-2 iTrans User Manual (P/N: 77023554-1)

iTrans Fixed Point Single/Dual Gas Monitor System Wiring

SYSTEM WIRING

Chapter

4

4.1. Introduction

This chapter outlines the steps required for wiring the gas monitor. These steps
include the following:

 Wiring Preparation  Sensor Wiring
 Alarm Relay Wiring  Power and Output Wiring
 ModBus Interface Wiring.

Each of these steps is outlined in the sections that follow.

IMPORTANT: Perform all wiring in accordance with local electrical codes and
local authorities having jurisdiction.

IMPORTANT: DC signal and AC power should not be run in the same conduit.

NOTE: All field wiring colors are arbitrary (unless provided by Oldham).

4.2. Wiring Preparation

1. Collect the appropriate types and lengths of wire.

 For control wire, use #18 AWG insulated, shielded cable.
 For signal and power wire, use three-conductor (or four-conductor for dual

channel) #18 AWG insulated and shielded cable.

 For digital ModBus signal and power, use a minimum of five-conductor

#18 AWG insulated and shielded cable.

2. Power down the unit.

3. Unthread the windowed top from the housing.

4. Gently pull out the electronics module and place it safely to the side of the unit.

5. Thread control, signal, and power wires into the transmitter housing.

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System Wiring iTrans Fixed Point Single/Dual Gas Monitor

6. Shielding from either the controller or remote sensors should be bonded to the

enclosure screw located inside the .

IMPORTANT: Use of this product in areas where it may be subject to large
amounts of electromagnetic interference may affect the reliable operation of this
device and should be avoided.

WARNING: Supply wire with a minimum rating of 90oC must be used for
interconnection to the .

NOTE: For classified locations, a “poured” wire seal must be installed within
18 inches of the main unit for both power entry and remote sensors.

NOTE: Remove power from the before making any wiring connections.

4.3. Alarm Relay Wiring (J1, J5, and J6)

To connect the control wires to the three relay terminals on the relay
board, wire the unit to the connectors shown in Figure 2-4. The low alarm relay
is activated when the low alarm threshold is met. This is a non-latching, Normally
Open (NO) contact. The high alarm relay is activated when the high alarm
threshold is met. This is a non-latching, Normally Open (NO) contact. The fault
alarm relay is activated upon power-up of the . When the fault condition
is met, the circuit opens. This is an Electronically closed (NO) contact. See Figure
4-1 for relay wiring.

NOTE: It is recommended that on-board relays should not be used to drive loads
directly. On-board relays should be used to drive a secondary, higher-power relay
which is connected to the control device (e.g., strobe, siren, exhaust fan, etc.).

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iTrans Fixed Point Single/Dual Gas Monitor System Wiring

Figure 4-1. Alarm Relay Connectors J6, J5 and J1

4.4. Power and Output Wiring (J1)

Connect the power and signal wires to the appropriate wiring terminals
as follows.

24 V: Connect 24 VDC (12-28 VDC) supply power
CH 1: Channel 1, 4-20 mA output signal
CH 2: Channel 2, 4-20 mA output signal
GND: DC return

Figure 4-2. Power and Signal Connector J1 on the

NOTE: Use supplied green conductor for enclosure ground. Public 485 GND is

to be used for ModBus digital ground.

NOTE: The is a 3- or 4-wire 4-20 mA device. For dual sensor
configuration you must have a second 4-20 mA signal wire pulled to the unit.

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System Wiring iTrans Fixed Point Single/Dual Gas Monitor

NOTE: When not using 4-20 mA outputs, use the supplied resistors to connect
CH-1 and CH-2 to GND. If these resistors are not connected and the 4-20 mA
outputs are not used, a “P” will appear on the display, indicating an open loop
condition.

4.5. Sensor Wiring (J3)

Connect the sensor wires (for on-board, remote or stand-alone) to the
appropriate wiring terminals as follows.

24 V: Red wire from sensor head (Red wire on BBIR)
485A: Yellow wire from sensor head (White wire on BBIR)
485B: Black wire from sensor head (Green wire on BBIR)
GND: Green wire from sensor head (Black wire on BBIR)

NOTE: Shielding from either the controller or remote sensors should be bonded

to the enclosure screw located inside the .

NOTE: The 24 V terminal supplies 24 VDC to the sensor for power. This
terminal should not be connected to the output of a 24 VDC power supply.

Figure 4-3. Sensor Connector J3 on the

NOTE: For dual-sensor configurations, place both of the same colored wires in

the appropriate terminal block and firmly tighten.

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iTrans Fixed Point Single/Dual Gas Monitor System Wiring

NOTE: Use #18 AWG shielded cable for remote sensors. Maximum distance is
200 meters (BBIR maximum distance is 300 feet with #18 AWG wire).

NOTE: When wiring remote sensors to the , “485 B” on J3 should be
connected to “B-” in the remote sensor enclosure, and “485 A” on J3 should be
connected to “A+” in the remote sensor enclosure.

NOTE: For remote or standalone sensors, there are four terminal blocks located in
the remote sensor housing. These terminal blocks are all tied together and follow
the same wiring scheme mentioned above.

(P/N: 77023554-1) iTrans User Manual 4-5