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.

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System Wiring iTrans Fixed Point Single/Dual Gas Monitor

Figure 4-4. Wiring Diagram for a Single On-board Sensor

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iTrans Fixed Point Single/Dual Gas Monitor System Wiring

Figure 4-5. Wiring Diagram for a Remote Sensor (Stand Alone)

NOTE: When the remote sensor is at distances of 200 meters or further, and the

sensor is not communicating, the jumper may need to be moved to terminals 1-2.

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System Wiring iTrans Fixed Point Single/Dual Gas Monitor

NOTE: If using remote sensors and the does not recognize the sensor
upon power up (displays a sensor fault), check the placement of this jumper. If the
jumper is on terminals 1-2, move the jumper to terminals 2-3.

For digital ModBus signal and power use a minimum of 4 conductors #18 AWG
insulated and shielded cable.

Shielding from either the controller or remote sensors should be bonded to the
enclosure screw located inside the .

Figure 4-6. Wiring Diagram for Dual On-board Sensors

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iTrans Fixed Point Single/Dual Gas Monitor System Wiring

Figure 4-7. Wiring Remote Sensors Back to

Figure 4-8. Wiring Dual Remote Sensors

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System Wiring iTrans Fixed Point Single/Dual Gas Monitor

4.6. Digital ModBus RTU Interface Wiring (J1)

4.6.1. ModBus Interface Wiring Overview

To interface the to a digital controller, PLC, or HMI, connect the power
and ground to the appropriate terminals mentioned above. The digital signals are
wired into the RS485A and RS485B terminals on the board. See Figure 4-9.

Figure 4-9. Wiring Diagram for the ModBus Interface

4.6.2. Setting the ModBus Address on the
Located on the back of the electronics module is an 8-position DIP switch.

This switch bank is used to set the ModBus Slave Address for the
unit. The address can be set from 1 to 255. Use the DIP switches to set the
binary representation of the desired address. 1 is bit zero, and 8 is bit 7. ON
represents a 1, and OFF represents zero. Refer to Appendix B for hex-to­decimal equivalents.

Figure 4-10. Switch Bank for Setting ModBus Slave Address

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iTrans Fixed Point Single/Dual Gas Monitor System Wiring

Figure 4-11. Setting the ModBus Address (Example Address of 240 Decimal)

4.6.3. Setting the ModBus Address for Stand-Alone Sensors

NOTE: This section is only necessary if you are connecting a sensor directly to a

ModBus controller, PLC, or digital system.

For stand-alone sensor heads used in a ModBus network, the address is set in the
same manner. Once the aluminum sensor head is removed with the sensor board,
the sensor electronics module is exposed. On the back of the sensor electronics
module is a small 8-position DIP switch. The address can be set from 1 to 255 in a
similar manner as setting the ModBus address on the except pin 8 on the
sensor’s 8-position DIP switch is the least significant bit, and pin 1 is the most
significant bit.

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System Wiring iTrans Fixed Point Single/Dual Gas Monitor

Figure 4-12. Location of Address DIP Switch on Sensor Electronics Module

Figure 4-13. Setting the ModBus Address for a Stand-Alone Sensor

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iTrans Fixed Point Single/Dual Gas Monitor System Wiring

NOTE: If adding a second sensor to an existing module, set the ModBus address
to  which represents 11110000 binary (and 240 decimal). See
Chapter 6 for more information on the ModBus interface. (Note that DIP switches
are pre-set at the factory for all dual-sensor units).

4.7. Wiring Conclusion

Once wiring is complete, place the electronics module back in the
housing by pressing the standoff banana jacks into the mating plugs. Be careful
not to pinch any of the wiring. After the module is in place, secure the windowed
top back on the housing and power up the unit.

  

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iTrans Fixed Point Single/Dual Gas Monitor Operation

OPERATION

Chapter

5

During this warm-up period, the
4-20 mA outputs are limited to 3 mA
(16 mA for oxygen). After the three
minute warm-up, the unit will enter
the Normal Operating Mode. If during
the warm-up period, the unit fails a
self test, the display will show a fault
code, and the fault relay will be
activated. Fault codes are located in
Chapter 8.

Figure 5-1. Sample Fault Code Display

5.1. Initial Start-up

Once power is applied (12-28 VDC), the is operational. The LED
display powers up, and the system enters a start-up period. During this start-up
period, the identifies the sensors that are connected and then enters a
three minute warm-up period.

NOTE: Upon initial power up, broadband infrared (BBIR) sensors do not store or
transmit the default values for Low Alarm, High Alarm, and 4-20 mA range to the

unit. These values are set to zero, and must be set following the

procedures outlined later in this manual.

5.2. Warm-up Period

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Operation iTrans Fixed Point Single/Dual Gas Monitor

In Normal Operating Mode, the

gas monitor will display the
instantaneous readings for each sensor
wired into the unit. The top of the

display shows the gas
reading for Sensor 1. Sensor 1 should
have the internal dip switches set to 00
hex or 0F hex. The bottom row of the

display shows the gas
reading for Sensor 2. Sensor 2 should
have the internal dip switches set to F0
hex.

Figure 5-2. Sample Dual-Sensor

Display

As gas concentrations increase, the

respective channel’s readings will

respond accordingly. If low or high
alarm levels are exceeded, an alarm
indication will appear in the first digit
of the display. An “L” indicates a low
alarm while an “H” indicates a high
alarm. If a 4-20 mA fault occurs,

either a “P” indicating an open loop, or
an “U” indicating 4-20 over-range will

be present.

Figure 5-3. Sample Low and High

Alarm Displays

5.3. Normal Operating Mode

From the Normal Operating Mode, the can enter into the program mode
in one of two ways. To enter the Program Mode without opening the enclosure,
pass over the embedded reed switch located under CH1 with the magnetic wand
(see Figure 5-4). This will enter you into the non-intrusive program mode.

In this mode you can check sensor type, zero the unit, calibrate the unit, change the
span gas value, and view sensor span. With the enclosure top removed, Program
Mode can be entered using the “MODE” key. The available functions are listed in
Chapter 8: Troubleshooting.

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iTrans Fixed Point Single/Dual Gas Monitor Operation

Figure 5-4. Locations of Reed Switches and Push Buttons

5.4. Programming Mode Overview

NOTE: Zeroing and calibrating the instrument can be accomplished one of two

ways via programming mode. Zeroing and calibrating (as well as other
programming options) can be entered either from the keypad or non-intrusively
using the magnetic wand. Refer to the sections and subsections within this chapter
for detailed information.

When in the Programming Mode, either via the magnetic wand or keypad
operation, the top line of the main display area shows a status bit and three data
bits. The bottom line of the display shows the timers (see Figure 5-5). The
decimals on the far right of each line of the display are channel indicators. The top
decimal indicates channel 1 is being programmed, and the bottom decimal
indicates channel 2.

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Operation iTrans Fixed Point Single/Dual Gas Monitor

Figure 5-5. Components of the Display

5.5. Programming Mode – Non-intrusive Operation

5.5.1. Introduction

Non-intrusive calibration and programming is accomplished using a magnetic
wand that comes with the unit. Placing the magnetic wand over the
embedded reed switches located under the CH1 and CH2 designations (see
Figure 5-4) of the faceplate will allow you to scroll through menus and enter the
desired function. The functions available through non-intrusive operation are as
follows.

 Sensor Type
 Zero
 Calibration
 Span Gas Value
 Span Reserve (in this order).

NOTE: Please see the Chapter 8 for a complete list of functions and function
codes.

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iTrans Fixed Point Single/Dual Gas Monitor Operation

To enter non-intrusive operation
during the Normal Operating Mode,
place the magnetic wand over the CH1
designation. The will
display the sensor type for channel 1
for 5 seconds then enter in the Zero
Menu.

Figure 5-6. Sample Display Entering

Non-Intrusive Mode

Zeroing is the first option in the setup
menu. A “0 ” is displayed in the status
bit of the display to designate this
function. A 10 second timer is
displayed on the bottom line of the
LED display. To initiate zeroing, place
the magnetic wand over CH2 during
the 10-second countdown. If you do
not initiate zeroing during the 10­second countdown, the will
return to the Normal Operating Mode.
To abrot zeroing at any time, place the
magnatic wand over CH1.

Figure 5-7. Sample Zeroing Display

5.5.2. Sensor Type

NOTE: If you want to operate channel 2, place the magnetic wand on CH2 first to

enter the setup menu.
Once non-intrusive mode is entered, placing the magnetic wand over CH1, will

allow scrolling through all of the functions that are available. Once the desired
function is reached, a 10-second timer will appear on the bottom row of the LED
display. During this 10-second time out, if the magnetic wand is placed over CH2,
that function is entered. Once a function is entered, a new timer will appear.

5.5.3. Zeroing

If you initiate zeroing, the status bit will start to flash. Once zeroing is complete,
the unit will return to the Normal Operating Mode.

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Operation iTrans Fixed Point Single/Dual Gas Monitor

Calibration is the next available
option. Calibration is designated with
a “C” in the status bit. A 10 second
timer is displayed on the bottom line
of the LED display. To initiate
calibration, place the magnetic wand
over CH2 during the 10-second
countdown. If you do not initiate
calibration during the 10-second
countdown, the will return
to the Normal Operating Mode. If you
initiate calibration, the status bit will
start to flash and the will
enter the zeroing process.

Figure 5-8. Sample Calibration Display

The will automatically zero
before calibration. Zeroing is
designated with a flashing “0” in the
status bit. Once zeroing is complete,
the will automatically enter
the calibration routine. Calibration is

designated with a flashing “C” in the

status bit.
After zeroing finishes, the is

ready to calibrate. When the flashing
“C” appears on the display, apply
calibration gas. As the
responds to the gas, the current
reading will be displayed on the top
line of the LED display. To abort
calibration at any time, place the
magnetic wand over CH1.

Figure 5-9. Sample Zeroing Display

5.5.4. Calibration

NOTE: Before the will calibrate, the unit will enter the zeroing process.

Please make sure that you apply Zero Air to the instrument while it is zeroing.

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iTrans Fixed Point Single/Dual Gas Monitor Operation

NOTE: Check and verify span setting
before starting a calibration.

NOTE: See Appendix D for a
complete list of factory default span
gases.

NOTE: Flow rate for calibration is

0.5 liter per minute (LPM) except for
NH3, ClO2, Cl2, NO2, SO2, and HCl
which require 1.0 LPM.

Figure 5-10. Apply CalGas Display

The option after calibration is Span
Gas Concentration. The span option is
designated with a flashing “S” in the
status bit with the current span value
next to it. To change the span value,
place the magnetic wand over CH2
during the 10-second countdown. If
you do not place the magnet over CH1
during the 10-second countdown, the

will return to the Normal
Operating Mode. If you initiate the
change span option, the status bit will
start to flash and the span
value can now be changed.

The current span value is displayed on
the top line of the LED display. To
increment the span value, pass the
magnetic wand over CH1. When the
desired value is reached, pass the
magnetic wand over CH2 to accept
and save changes. Passing over CH1
or letting the timer count down to zero
without saving the new value, will
take you back into the Programming
Mode.

Figure 5-11. Sample Span Gas

Concentration Display

Figure 5-12. Flashing Status Bit

5.5.5. Changing Span Gas Concentration

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Operation iTrans Fixed Point Single/Dual Gas Monitor

The last option available is viewing
the sensor span reserve. The span
reserve option is designated with an
“r” in the status bit. The current span
reserve is displayed on the top line of
the LED display.

Figure 5-13. Sample Span Reserve

Display

In a safe environment where the
windowed top of the transmitter can be
removed, there are more programming
options available. These programming
options include all of the functions
available in the non-intrusive mode as
well as a few others. These items are
password protected. To enter the
programming options, press the

“Mode” key. The access code is

“Mode”, “Up”, “Down”, “Up”,

“Enter”.

Figure 5-14. Sample Code Entry

Display

NOTE: Span Gas Concentration for combustibles can be set from 0% to

100%LEL. For the sake of resolution, the Span Gas Concentration should be set
above 20% LEL.

5.5.6. Sensor Span Reserve

5.6. Programming Mode – Push Button Operation

5.6.1. Introduction

Once the correct password has been entered, the user will have to select a channel
for programming. But in case of wrong password or time out (10 second) the
display will revert back to Normal Operating Mode.

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iTrans Fixed Point Single/Dual Gas Monitor Operation

On entering the correct password, the
channel selection screen will be
displayed on the LED display. Press

the “Mode” button to switch between

the available channels then press the

“” button to confirm the channel

selection.
Once a channel is selected, the gas

type for that sensor is displayed on the
top row of the LED display for 5-7
second. After that the LED display
will show the list of available
functions. Use the arrow keys to scroll
through the list of functions available.

Figure 5-15. Sample Channel Selection

Display

The low alarm setpoint is designated
with an “L” displayed in the status bit
and current low alarm value displayed
next to it. To change the low alarm

setpoint, press the “” button during

the 10-second countdown. If you do
not press “” during the 10-second
countdown, the will return
to the Normal Operating Mode. If you
initiate the low alarm option, the status
bit will start to flash and the
low alarm setpoint can be changed by

Figure 5-16. Sample Low Alarm

Setpoint Display

NOTE: If display shows “ iNet” confirm setting is “0” to ensure proper function

of onboard relay.

NOTE: Please see Chapter 8 for a complete list of functions and function codes.

5.6.2. Entering Programming Mode and Selecting a Channel

NOTE: If you have a dual-sensor unit, use the “Mode” button to switch between

the channel.

5.6.3. Set Low Alarm

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Operation iTrans Fixed Point Single/Dual Gas Monitor

When the desired value is reached,

press the “” key to accept and save

the new value. If the value is not
saved before the time-out, the

will go back to the

Programming Mode.

5.6.5. 4-20 mA Analog Output
Range

The range of 4-20 mA analog output is
set to full range as factory default. For
full range values, see Appendix D. If
the user desires to change the output
scaling of the 4-20 mA analog signal,
they can do so.

Figure 5-17. Sample High Alarm

Setpoint Display

using the “” and “” keys. When the desired value is reached, press the “” key
to accept and save the new value. If the value is not saved before the time-out, the

will go back to the Programming Mode.

5.6.4. Set High Alarm

The high alarm setpoint is designated with an “H” displayed in the status bit and
the current high alarm value displayed next to it. To change the high alarm

setpoint, press the “” button during the 10-second countdown. If you do not
press “” during the 10-second countdown, the will return to the

Normal Operating Mode. If you initiate the high alarm option, the status bit will
start to flash and the high alarm setpoint can be changed by using the “”
and “” keys.

NOTE: Only the upper end range can be changed. The low end is always set for
4 mA.

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iTrans Fixed Point Single/Dual Gas Monitor Operation

The 4-20 mA setpoint is designated
with a “4” displayed in status bit and
the current high end range next to it.

To change the range, press the “”

button during the 10-second
countdown. If you do not press “”

during the 10-second countdown, the

will return to the Normal
Operating Mode. If you initiate the
4-20 mA range option, the status bit
will start to flash and the
range setpoint can be changed by
using the “” and “” keys.

When the desired value is reached,

press the “” key. If the value is not

saved before the time-out, the

will go back to the

Programming Mode.

Figure 5-18. Changing the Analog

Output Upper Value

The system’s clock minute setting is
designated with a “1” in the status

bit and current value next to it. To

change the minutes, press the “”

button during the 10-second
countdown. If you do not press “”
during the 10-second countdown, the

will return to the Normal
Operating Mode. If you initiate the
minutes option, the status bit will
start to flash and the
minute can be changed by using the

“” and “” keys.

Figure 5-19. Setting System Time

(Minutes)

5.6.6. Set System Time – Minute

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Operation iTrans Fixed Point Single/Dual Gas Monitor

The system’s clock hour setting is
designated with an “h” in the status

bit and current value next to it. To

change the hour, press the “” button

during the 10-second countdown. If
you do not press “” during the 10­second countdown, the will
return to the Normal Operating Mode.
If you initiate the hours option, the
status bit will start to flash and the

hour can be changed by

using the “” and “” keys.

Figure 5-20. Setting System Time (Hour)

The system’s day of the month setting
is designated with a “d” in the status

bit and current value next to it. To

change the day, press the “” button

during the 10-second countdown. If
you do not press “” during the 10­second countdown, the will
return to the Normal Operating Mode.
If you initiate the days option, the
status bit will start to flash and the

day can be changed by

using the “” and “” keys.

Figure 5-21. Setting System Date

When the desired value is reached, press the “” key. If the value is not saved

before the time-out, the will go back to the Programming Mode.

5.6.7. Set System Time – Hour

When the desired value is reached, press the “” key. If the value is not saved

before the time-out, the will go back to the Programming Mode.

5.6.8. Set System Time – Day

When the desired value is reached, press the “” key. If the value is not saved

before the time-out, the will go back to the Programming Mode.

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The system’s month setting is

designated with an “E” in the status bit

and current value next to it. To

change the month, press the “”

button during the 10-second
countdown. If you do not press “”
during the 10-second countdown, the

will return to the Normal
Operating Mode. If you initiate the
month option, the status bit will start
to flash and the month value

can be changed by using the “” and
“” keys.

Figure 5-22. Setting System Month

The system’s year setting is designated

with an “8” in the status bit and

current value next to it. To change the

year, press the “” button during the

10-second countdown. If you do not
press “” during the 10-second
countdown, the will return
to the Normal Operating Mode”. If
you initiate the year option, the status
bit will start to flash and the
year value can be changed by using
the “” and “” keys.

Figure 5-23. Setting System Year

5.6.9. Set System Time – Month

When the desired value is reached, press the “” key. If the value is not saved

before the time-out, the will go back to the Programming Mode.

5.6.10. Set System Time – Year

When the desired value is reached, press the “” key. If the value is not saved

before the time-out, the will go back to the Programming Mode.

5.6.11. Zeroing

Zeroing is an option available both through the keypad and non-intrusively. A “0 ”
is displayed in the status bit of the display to designate this function. A 10 second
timer is displayed on the bottom line of the LED display.

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Operation iTrans Fixed Point Single/Dual Gas Monitor

To initiate zeroing, press the “” key

during the 10-second countdown. If
you do not initiate zeroing during the
10-second countdown, the
will return to the Normal Operating
Mode. If you initiate zeroing, the
status bit will start to flash. Once
zeroing is complete, the unit will
return to the Normal Operating Mode.
To abort zeroing at any time, press the

“Mode” key.

Figure 5-24. Sample Zeroing Display

The calibration option is also available
through the keypad. Calibration is
designated with a “C” in the status bit.
A 10 second timer is displayed on the
bottom line of the LED display. To

initiate calibration, press the “”key

during the 10-second countdown. If
you do not initiate calibration during
the 10-second countdown, the

will return to the Normal
Operating Mode. If you initiate
calibration, the status bit will start to
flash and the will enter the
zeroing process.

Figure 5-25. Sample Calibration

Display

5.6.12. Calibration

NOTE: Before the will calibrate, the unit will enter the zeroing process.

Please make sure that you do not apply gas to the instrument while it is zeroing.

The will automatically zero before calibration. Zeroing is designated
with a flashing “0” in the status bit. Once zeroing is complete, the will
automatically enter the calibration routine. Calibration is designated with a
flashing “C” in the status bit.

After zeroing finishes, the is ready to calibrate. When the flashing “C”
appears on the display, apply calibration gas. As the responds to the gas,

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iTrans Fixed Point Single/Dual Gas Monitor Operation

The span option is designated with a
flashing “S” in the status bit with the
current span value next to it. To

change the span value, press the “”

key during the 10-second countdown.

If you do not press the “” during the

10-second countdown, the
will return to the Normal Operating
Mode. If you initiate the change span
option, the status bit will start to flash
and the span value can now
be changed.

Figure 5-26. Sample Span Gas

Concentration Display

The current span value is displayed on
the top line of the LED display. Use

the “” and “” keys to change the

span value. When the desired value is

reached, press the “” key to save
changes. Pressing the “Mode” key or

letting the timer count down to zero
without saving the new value, will
take you back into the Programming
Mode.

Figure 5-27. Flashing Status Bit

the current reading will be displayed on the top line of the LED display. To abort
calibration at any time, press the “Mode” key.

NOTE: Check and verify span setting before starting a calibration.

NOTE: Please refer to Appendix D for a complete list of factory default span

gases.

NOTE: Flow rate for calibration is 0.5 liter per minute (LPM) except for NH3,
ClO2, Cl2, NO2, SO2, and HCl which require 1.0 LPM.

5.6.13. Changing Span Gas Concentration

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Operation iTrans Fixed Point Single/Dual Gas Monitor

The span reserve option is designated
with an “r” in the status bit. The
current span reserve is displayed on
the top line of the LED display.

NOTE: There are a few other options
that appear that do not have any
function associated with them. These
are reserved for future functionality.

Figure 5-28. Sample Span Reserve

Display

NOTE: If the “” key is not pressed, the new span value will not be saved.

NOTE: Span Gas Concentration for combustibles can be set from 0% to

100%LEL. For the sake of resolution, we suggest that Span Gas Concentration
should be set above 20% LEL.

5.6.14. Sensor Span Reserve

5.7. Special Notes on Using Broadband Infrared (BBIR) Sensors

The broadband infrared (BBIR) sensor currently used with the gas
monitor does not fully support or follow all of the functionality or procedures listed
within this manual. Differences between the functionality of the BBIR sensor and
the operation explained in this manual are as follows:

 There is no real time clock in the BBIR sensor. When looking at the clock

settings, they will be displayed as time and date of initial test. If you set
these values, they will not increment.

 Low alarm, high alarm, and 4-20 mA range are factory pre-set to 10, 20, and

100 respectively.

 When calibrating the BBIR sensor, the display will not show the actual

concentration of gas applied, it will display zero. Once the calibration is
complete, the display will switch from zero to the actual concentration of gas
applied.

 The Span Gas Concentration is fixed at 50% LEL and cannot be changed.
 The typical zero time for the BBIR sensor is 3 minutes.
 The typical calibration time for the BBIR sensor is 3 minutes.

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iTrans Fixed Point Single/Dual Gas Monitor Operation

 After a calibration, the span reserve for the BBIR sensor is not available to

the end user.

 The BBIR sensor’s digital address is set at the factory for Channel 1

operation (0x0F) or Channel 2 operation (0xF0). This digital address
cannot be changed in the field.

If you have any questions concerning the functionality of the BBIR sensor and the

, please contact Oldham at 1-713-559-9280 or

[e-mail].

  

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iTrans Fixed Point Single/Dual Gas Monitor ModBus Interface

MODBUS INTERFACE

Chapter

6

Characteristic

Description

Hardware

2-wire mode (not 4-wire)

Baud Rate

9600

Electrical Standard

TIA/EIA-485

Transmission Mode

RTU mode (not ASCII)

Message Coding System

8-bit

Start Bits

1

Data Bits

8 (LSB sent first)

Parity Bits

0

Stop Bits

1

6.1. Introduction

When programming the ModBus ID address on the electronics module
or on the smart sensor board, use the binary reference chart on the following page.

A “1” represents “ON” on the switch bank, and position 1 of the switch bank

represents the right most binary digit (LSB).
ModBus characteristics for the are listed below.

Table 6-1. ModBus Characteristics for the Gas Monitor

Important: When commissioning master and slave units on a ModBus network, it

is critical to ensure that every device on the ModBus network must have a unique
address. Otherwise, abnormal behavior of the entire serial bus can occur.

6.2. Sample Gas Reading via ModBus Network

To get a gas reading for Channel 1, you must read register 40102. This register
holds the gas reading in ppm.

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ModBus Interface iTrans Fixed Point Single/Dual Gas Monitor

Addr

Inst

R/W

Host
R/W

Range

Description

40101

R/W

R/W

MSB = $01 to $FF

LSB = $01 to $F7

Sensor Type
Holds the sensor instrument type code and

ModBus address. The most significant byte
(MSB) holds a value indicating the type of
instrument (see below). The least significant
byte (LSB) holds a value which is the ModBus
address of the sensor.

MSB = Instrument type code $01 to $FF
$03 = BBIR (broad band infrared)
$04 = TOX (toxic)
$05 = OXY (oxygen)
$06 = AAW (toxic)
$07 = CAT (catalytic)
LSB = MODBUS sensor address $01 to $F7

(1 to 247)

40102

W R $0000 to $FFFF

Gas Reading

Holds the gas reading in ppm or percent
depending upon the sensor in the instrument.
The range is from $0000 to $FFFF and
represents a signed decimal value range
from -32768 to +32767.

Examples:
+5 ppm = register value of 0000510 = $0005

-5 ppm = register value of 6553110 = $FFFB

Example: Gas reading of 5 ppm = register value of $0005.

Example: Gas reading of 20.9% = register value of $0209.
For Channel 2 you can access the gas reading by looking at register 40202.
For a full list of ModBus commands and registers that are accessible on the

, refer to the next section or, for the most up-to-date list, contact the

Technical Support group of Oldham at 1-713-559-9280.

6.3. ModBus Register List

ModBus register addresses are provided in Table 6-2.

Table 6-2. ModBus Registers

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

iTrans Fixed Point Single/Dual Gas Monitor ModBus Interface

Addr

Inst

R/W

Host
R/W

Range

Description

40103

R*

R*

MSB = $01 to $FF

LSB = $01 to $FF

Gas Type
Holds the decimal place holder and the gas type

code. The most significant byte (MSB) holds
the number of decimal places to be used in
calculations for this gas. This decimal locator
applies to all subsequent values of gas readings
within other registers. This can be read by the
instrument. The least significant byte (LSB)
holds a code which identifies the gas type.
This can be read by the host.

MSB = Decimal place holder $01 to $FF
LSB = Gas type code $01 to $FF

$01 CO Carbon Monoxide
$02 H2S Hydrogen Sulfide
$03 SO2 Sulfur Dioxide
$04 NO2 Nitrogen Dioxide
$05 Cl2 Chlorine
$06 ClO2 Chlorine Dioxide
$07 HCN Hydrogen Cyanide
$08 PH3 Phosphine
$09 H2 Hydrogen
$0C NO Nitric Oxide
$0D NH3 Ammonia
$0E HCl Hydrogen Chloride
$14 O2 Oxygen
$15 CH4 Methane
$16 LEL Lower Explosive Limit

(Combustible Gases)

Examples:

$0107 = 1 decimal place for gas type HCN
$0002 = 0 decimal places for gas type H2S
$0206 = 2 decimal places for ClO2

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ModBus Interface iTrans Fixed Point Single/Dual Gas Monitor

Addr

Inst

R/W

Host
R/W

Range

Description

40105

W

R/W

$0000 to $FFFF

Instrument Mode
Holds code for current mode of instrument.

Possible working modes of instrument are listed
below.

$0001 Normal
$0002 Calibration
$0003 Warm-up
$0006 Zeroing
$0008 Fault
$0009 Reset

Examples:

Sensor in zero fault = $0008
Sensor zeroing = $0006

40106

W R $0000 to $FFFF

Status Bits
Holds 16 bits of status for various parameters in

the instrument. A bit value of “1” indicates that

the associated fault condition is present.

Bit 15 = current loop open
Bit 14 = current loop shorted
Bit 13 = power fault
Bit 12 = 5 volt fault
Bit 11 = missing sensor
Bit 10 = (not defined)
:
Bit 6 = (not defined)
Bit 5 = zero fault
Bit 4 = calibration fault
Bit 3 = over-range
Bit 2 = failed sensor
Bit 1 = high alarm
Bit 0 = low alarm

Examples:

Missing sensor = Bit 11 is set = $0800
Power fault and

failed sensor = Bits 13 and 2 set = $2004

40115

W

R

Last Alarm Date (mmdd)

Holds the month and day when the instrument
had the last alarm.

6-4 iTrans User Manual (P/N: 77023554-1)

iTrans Fixed Point Single/Dual Gas Monitor ModBus Interface

Addr

Inst

R/W

Host
R/W

Range

Description

High byte = $01 to $0C
Low byte = $01 to $1F

Examples:

Dec 25 is represented as $0C19
June 31 is represented as $061F

40116

W

R

Last Alarm Date (00yy)

Holds the last two digits of the year when the
instrument was last in alarm. The first two
digits are assumed to be “20”.

High byte = $00, Low byte = $02 to $63
Examples:
2002 is represented by $02
2099 is represented by $63

40117

R

R/W

MSB=$01 to $0C,

LSB=$01 to $1F

RTC Month and Day
Holds the month and day to which the real time

clock (RTC) calendar should be set. The most
significant byte (MSB) represents the month
from $01 to $0C (1-12). The least significant
byte (LSB) represents the day of the month
from $01 to $1F (1-31).

Examples:

December 25 = $0C19
June 31 = $061F

40118

R

R/W

$0002 to $0063

RTC Year (00yy)
Holds the year to which the real time clock

(RTC) should be set. The most significant byte
(MSB) is always $00. The least significant byte
(LSB) represents the two-digit year (within the
21st century), from $02 (which represents 2002)
to $063 (which represents 2099).

Examples:

2002 = 02 (+ base year of 2000) = $0002
2010 = 10 (+ base year of 2000) = $000A
2099 = 99 (+ base year of 2000) = $0063

40119

R

R/W

MSB=$00 to $18,

LSB=$00 to $3C

RTC Hours and Minutes
Holds the hours and minutes to which the RTC

should be set. The most significant byte (MSB)
represents the hour from $00 to $18 (00-24).
The least significant byte (LSB) represents the

(P/N: 77023554-1) iTrans User Manual 6-5

ModBus Interface iTrans Fixed Point Single/Dual Gas Monitor

Addr

Inst

R/W

Host
R/W

Range

Description

minutes from $00 to $3C (00 to 60). Note that
the seconds default to zero ($00) each time the
hours and minutes are set.

Examples:

13:05 = $0D05
24:00 = $1800

40124

R

R/W

$0000 to $FFFF

Low Alarm Display Setting
Holds the value of the gas reading at which the

low alarm display will activate.

40125

R

R/W

$0000 to $FFFF

High Alarm Display Setting
Holds the value of the gas reading at which the

high alarm display will activate.

40126

R

R/W

$0000 to $03E8

Cal Gas Value
Holds the value of the calibration gas to be used

on the instrument. The range is from $0000 to
$03E8 (0 to 100010).

40127

R/W R $0000 to $FFFF

Loop High Scaling

Holds a value which indicates the gas reading
represented by a 20 mA loop output signal. The
range is from $0000 to $FFFF.

440102

R R $0000 to $FFFF

WX Scaled Reading
Use with WX series controller.

NOTE: To get the ModBus reading, register 40103 must be read as well as

register 40102. Register 40103 specifies where the decimal should be placed.

6.4. ModBus Resources

ModBus is a public protocol that can be freely adopted by any developer or
manufacturer desiring to implement it. While a detailed discussion of ModBus
protocol is beyond the scope of this manual, there are a number of up-to-date
resources available on the internet for those wishing to investigate ModBus further.
The most complete resource is www.modbus.org.

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

iTrans Fixed Point Single/Dual Gas Monitor ModBus Interface

6.5. Termination

When putting devices on the ModBus network, a terminating resistor may be
required for the last device on the network (please see www.modbus.org for more
details). The has a blue jumper on the “public” jumper that can be used
to jumper in a 120-Ohm terminating resistor. By default, this jumper is not in
place. Oldham does not recommend changing the placement of any of the other
jumpers on this board.

Figure 6-1. Location of Jumpers

  

(P/N: 77023554-1) iTrans User Manual 6-7

ModBus Interface iTrans Fixed Point Single/Dual Gas Monitor

6-8 iTrans User Manual (P/N: 77023554-1)

iTrans Fixed Point Single/Dual Gas Monitor Maintenance

MAINTENANCE

Chapter

7

7.1. Introduction

Sensors have a variable life dependent on the sensor and the environment in which
they operate. Oxygen sensor life is about 2 years and toxic gas sensor life is
normally 2 years or greater. The catalytic combustible gas sensors normally
operate in excess of 3 years, while the infrared sensor carries a 5-year warranty
with an anticipated life of 7 or more years.

Sensors have baseline drift and their characteristics change with time. Thus, the

must be calibrated on a regular basis. Gas detection instruments are
potential life-saving devices. In recognition of 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 functional tests every
6 months.

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

NOTE: Other than regular calibrations, the require no other routine
maintenance.

NOTE: Take special care with handling and storing sensors. They are delicate
and can be damaged by storage in environments outside the specified temperature,
pressure, and humidity limits.

NOTE: Sensors are susceptible to damage from high pressure or low pressure,
especially if the change is sudden. Also, sensors should not be operated at
pressures that are 10% above or below atmospheric pressure.

(P/N: 77023554) iTrans User Manual 7-1

Maintenance iTrans Fixed Point Single/Dual Gas Monitor

NOTE: If sensors and the surrounding environment must be washed down at any
time, cover the opening of the sensor housing to protect it from water or excess
moisture. Remove cover when wash down is complete. An optional splashguard
is available for continuous protection.

7.2. Sensor Replacement

Sensor replacement must be done by qualified personnel. To replace the sensor,
shut down power to the unit. Un-thread the sensor-housing cap from the sensor
housing. There is a set screw that secures the cap to the housing. Once the cap is
removed, remove the old sensor and sensor board. When installing the new
sensor/sensor board make sure you line up the notch in the board with the
alignment pin. After the new sensor is in place, screw the sensor cap back on to
the housing and secure the set screw.

Once the new sensor is in place and has time to settle out, it should be zeroed and
calibrated for accuracy.

7.3. Zero and Calibration

Zeroing and calibrating the instrument can be accomplished one of two ways.
These routines can be entered either from the keypad or non-intrusively using the
magnetic wand. See Chapter 5: Operation for step-by-step procedures for zeroing
and calibrating the using the magnetic wand. Chapter 5 also contains
information on keypad zeroing and calibration.

  

7-2 iTrans User Manual (P/N: 77023554-1)

iTrans Fixed Point Single/Dual Gas Monitor Troubleshooting

TROUBLESHOOTING

Chapter

8

Symptom

Problem

Solution

LED display does not
light up.

Input voltage is too low

Electronics module has
failed

Check for presence of input
voltage.

Output outside
4-20 mA range

Unit in calibration mode

Electronics module has
failed

Exit calibration mode.

Replace electronics module.

Output does not
change when gas
concentration
changes

Electronics module has
failed

Replace electronics module.

Cannot calibrate
SPAN

Sensor has failed

Electronics module has
failed

Replace sensor and
calibrate.

Replace electronics module
and calibrate.

8.1. Introduction

This chapter provides troubleshooting information for the gas monitor.

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

(P/N: 77023554) iTrans User Manual 8-1

Troubleshooting iTrans Fixed Point Single/Dual Gas Monitor

Symptom

Problem

Solution

Reading drifts by 10
counts over a short
time period (in a
stable temperature
environment)

Sensor has failed

Electronics module has
failed

Replace sensor and
calibrate.

Replace electronics module
and calibrate.

In calibration, LED
displays wrong value.

Sensor has failed

Electronics module has
failed

Replace sensor and
calibrate.

Replace electronics module
and calibrate.

Reed Switch does not
work

Electronics module has
failed

Reed Switch is damaged

Replace electronics module
and calibrate.

Replace the reed switch.

“P” appears on the

display

Open loop on a 4-20 mA
channel

Place a 100-Ohm load
resistor from the mA output
pin to ground.

“U” appears on the

display

4-20 mA signal is in over
range

Ensure the sensor is
working properly and the
4-20 mA is scaled correctly.

Fault
Code

LED

Display

Status

Bit

4-20 mA

Output

Description

0FFF

0.

Flashing

1 mA

Zeroing error – Recover after
calibrating

CFFF

C.

Flashing

1 mA

Calibration error – Recover after
calibrating or replacing the sensor

1FFF

1.

Flashing

1 mA

SMART sensor error

2FFF

2.

Flashing

1 mA

Sensor error

8.3. Fault Codes
Table 8-2. Fault Codes

8-2 iTrans User Manual (P/N: 77023554-1)

iTrans Fixed Point Single/Dual Gas Monitor Troubleshooting

Function

Code

LED Display

Description

Status

Bit

Data Area

L

L.

Low Alarm

Set the relay low alarm value

H

H.

High Alarm

Set the relay high alarm value

4

4.

Range of 4-20 mA

Set the range of 4-20 mA output

1

1.

Minute

Set system time – minute

H

h.

Hour

Set system time – hour

D

d.

Date

Set system time – date

E

E.

Month

Set system time – month

8

8.

Year

Set system time – year

0

0.

Zeroing

C

C.

Calibration

S

S.

Span Gas Concentration

Set span gas concentration

R

r.

Sensor Span Reserve

Check the span reserve

2

2.

Date

The latest alarm time-date

3

3.

Month

The latest alarm time-month

6

6.

Date

The latest calibration time-date

7

7.

Month

The latest calibration time­month

9

9.

Year

The latest calibration time-year

8.4. Function Codes
Table 8-3. Function Codes

(P/N: 77023554) iTrans User Manual 8-3

  

Troubleshooting iTrans Fixed Point Single/Dual Gas Monitor

8-4 iTrans User Manual (P/N: 77023554-1)

iTrans Fixed Point Single/Dual Gas Monitor Warranty

WARRANTY

Chapter

9

9.1. Warranty

Oldham fixed system products are warranted to be free from defects in material
and workmanship for a period of eighteen (18) months from the date of shipment,
or one (1) year from the date of first use, whichever occurs first, except where
otherwise stated in writing in Oldham literature accompanying the product.

The above warranty does not include sensors, pumps, or filters, all of which are
warranted to be free from defects in material and workmanship for one year from
the date of shipment, except where otherwise stated in writing in Oldham literature
accompanying the product. In addition, Oldham warrants the Infrared sensor used
to monitor LEL Methane Propane to be free from defects in material and
workmanship for a period of sixty-six (66) months from the date of shipment, or
five (5) years from the date of first use, whichever occurs first, except where
otherwise stated in writing in Oldham literature accompanying the product.

9.2. Limitation of Liability

Oldham makes no other warranties, either expressed or implied, including, but not
limited to the warranties of merchantability or fitness for particular purpose.

Should the product fail to conform to the above warranty, buyer’s only remedy and

Oldham’s only obligation shall be, at Oldham’s sole option, replacement or repair
of such non-conforming goods or refund of the original purchase price of the non­conforming goods. In no event will Oldham be liable for any other special,
incidental or consequential damages, including loss of profit or loss of use, arising
out of the sale, manufacture or use of any products sold hereunder whether such
claim is pleaded in contract or in tort, including strict liability in tort.

It shall be an express condition to Oldham’s warranty that all products be carefully

inspected for damage by buyer upon receipt, be properly calibrated for buyer’s

particular use, and be used, repaired, and maintained in strict accordance with the
instructions set forth in Oldham’s product literature. Repair or maintenance by
non-qualified personnel will invalidate the warranty, as will the use of non-

(P/N: 77023554) iTrans User Manual 9-1

Warranty iTrans Fixed Point Single/Dual Gas Monitor

approved consumables or spare parts. As with any other sophisticated product, it is
essential and a condition of Oldham’s warranty that all personnel using the
products be fully acquainted with their use, capabilities and limitations as set forth
in the applicable product literature. Buyer acknowledges that it alone has
determined the intended purpose and suitability of the goods purchased. It is
expressly agreed by the parties that any technical or other advice given by Oldham
with respect to the use of the goods or services is given without charge and at
buyer’s risk; therefore, Oldham assumes no obligation or liability for the advice
given or results obtained.

SPECIFICATIONS SUBJECT TO CHANGE

  

9-2 iTrans User Manual (P/N: 77023554-1)

iTrans Fixed Point Single/Dual Gas Monitor Appendix A

ACRONYMS AND

ABBREVIATIONS

Appendix

A

Abbr

Definition

A

Ampere

ABS

acrylonitrile butadiene styrene

ASCII

American Standard Code for Information Interchange

BBIR

broadband infrared

bit

binary digit

bps

bits per second

C

centigrade

CALI

calibration

CAT

catalytic

Ch

channel

CH4

methane

chem

chemical

Cl2

chlorine

ClO2

chlorine dioxide

CO

carbon monoxide

CSA

Canadian Standards Association

DC

direct current

DCS

distributed control system

DIP

dual in-line package

DISP

display

F

Fahrenheit

FAQ

frequently asked questions

FAUL

fault

FIFO

first-in-first-out

GND

ground

This appendix contains acronyms and abbreviations that are used within this
document.

Table A-1. Acronyms and Abbreviations

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

Appendix A iTrans Fixed Point Single/Dual Gas Monitor

Abbr

Definition

H2

hydrogen

H2S

hydrogen sulfide

HCl

hydrogen chloride

HCN

hydrogen cyanide

LED

light emitting diode

LEL

lower explosive limit (combustible gases)

LSB

least significant bit

mA

milliampere

mm

millimeter

MSB

most significant bit

NC

normally closed

NDIR

non-dispersive infrared

NEMA

National Electrical Manufacturers Association

NH3

ammonia

NO

normally open, Nitric Oxide

NO2

nitrogen dioxide

NOR

normal mode

NRTL

nationally recognized testing laboratory

O2

oxygen

OXY

oxygen

PH3

phosphine

PLC

programmable logic controller

ppm

parts per million

REST

restart

RH

relative humidity

RTC

real time clock

RTU

remote terminal unit

SO2

sulfur dioxide

SPST

single-pole, single-throw

TOX

toxic

V

Volts

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

  

iTrans Fixed Point Single/Dual Gas Monitor Appendix B

DECIMAL, BINARY, AND
HEXADECIMAL

EQUIVALENTS

Appendix

B

0x00 = 000

0x20 = 032

0x40 = 064

0x60 = 096

0x80 = 128

0xA0 = 160

0xC0 = 192

0xE0 = 224

0x01 = 001

0x21 = 033

0x41 = 065

0x61 = 097

0x81 = 129

0xA1 = 161

0xC1 = 193

0xE1 = 225

0x02 = 002

0x22 = 034

0x42 = 066

0x62 = 098

0x82 = 130

0xA2 = 162

0xC2 = 194

0xE2 = 226

0x03 = 003

0x23 = 035

0x43 = 067

0x63 = 099

0x83 = 131

0xA3 = 163

0xC3 = 195

0xE3 = 227

0x04 = 004

0x24 = 036

0x44 = 068

0x64 = 100

0x84 = 132

0xA4 = 164

0xC4 = 196

0xE4 = 228

0x05 = 005

0x25 = 037

0x45 = 069

0x65 = 101

0x85 = 133

0xA5 = 165

0xC5 = 197

0xE5 = 229

0x06 = 006

0x26 = 038

0x46 = 070

0x66 = 102

0x86 = 134

0xA6 = 166

0xC6 = 198

0xE6 = 230

0x07 = 007

0x27 = 039

0x47 = 071

0x67 = 103

0x87 = 135

0xA7 = 167

0xC7 = 199

0xE7 = 231

0x08 = 008

0x28 = 040

0x48 = 072

0x68 = 104

0x88 = 136

0xA8 = 168

0xC8 = 200

0xE8 = 232

0x09 = 009

0x29 = 041

0x49 = 073

0x69 = 105

0x89 = 137

0xA9 = 169

0xC9 = 201

0xE9 = 233

0x0A = 010

0x2A = 042

0x4A = 074

0x6A = 106

0x8A = 138

0xAA = 170

0xCA = 202

0xEA = 234

0x0B = 011

0x2B = 043

0x4B = 075

0x6B = 107

0x8B = 139

0xAB = 171

0xCB = 203

0xEB = 235

0x0C = 012

0x2C = 044

0x4C = 076

0x6C = 108

0x8C = 140

0xAC = 172

0xCC = 204

0xEC = 236

0x0D = 013

0x2D = 045

0x4D = 077

0x6D = 109

0x8D = 141

0xAD = 173

0xCD = 205

0xED = 237

0x0E = 014

0x2E = 046

0x4E = 078

0x6E = 110

0x8E = 142

0xAE = 174

0xCE = 206

0xEE = 238

0x0F = 015

0x2F = 047

0x4F = 079

0x6F = 111

0x8F = 143

0xAF = 175

0xCF = 207

0xEF = 239

0x10 = 016

0x30 = 048

0x50 = 080

0x70 = 112

0x90 = 144

0xB0 = 176

0xD0 = 208

0xF0 = 240

0x11 = 017

0x31 = 049

0x51 = 081

0x71 = 113

0x91 = 145

0xB1 = 177

0xD1 = 209

0xF1 = 241

0x12 = 018

0x32 = 050

0x52 = 082

0x72 = 114

0x92 = 146

0xB2 = 178

0xD2 = 210

0xF2 = 242

0x13 = 019

0x33 = 051

0x53 = 083

0x73 = 115

0x93 = 147

0xB3 = 179

0xD3 = 211

0xF3 = 243

0x14 = 020

0x34 = 052

0x54 = 084

0x74 = 116

0x94 = 148

0xB4 = 180

0xD4 = 212

0xF4 = 244

0x15 = 021

0x35 = 053

0x55 = 085

0x75 = 117

0x95 = 149

0xB5 = 181

0xD5 = 213

0xF5 = 245

0x16 = 022

0x36 = 054

0x56 = 086

0x76 = 118

0x96 = 150

0xB6 = 182

0xD6 = 214

0xF6 = 246

0x17 = 023

0x37 = 055

0x57 = 087

0x77 = 119

0x97 = 151

0xB7 = 183

0xD7 = 215

0xF7 = 247

0x18 = 024

0x38 = 056

0x58 = 088

0x78 = 120

0x98 = 152

0xB8 = 184

0xD8 = 216

0xF8 = 248

0x19 = 025

0x39 = 057

0x59 = 089

0x79 = 121

0x99 = 153

0xB9 = 185

0xD9 = 217

0xF9 = 249

0x1A = 026

0x3A = 058

0x5A = 090

0x7A = 122

0x9A = 154

0xBA = 186

0xDA = 218

0xFA = 250

0x1B = 027

0x3B = 059

0x5B = 091

0x7B = 123

0x9B = 155

0xBB = 187

0xDB = 219

0xFB = 251

0x1C = 028

0x3C = 060

0x5C = 092

0x7C = 124

0x9C = 156

0xBC = 188

0xDC = 220

0xFC = 252

0x1D = 029

0x3D = 061

0x5D = 093

0x7D = 125

0x9D = 157

0xBD = 189

0xDD = 221

0xFD = 253

0x1E = 030

0x3E = 062

0x5E = 094

0x7E = 126

0x9E = 158

0xBE = 190

0xDE = 222

0xFE = 254

0x1F = 031

0x3F = 063

0x5F = 095

0x7F = 127

0x9F = 159

0xBF = 191

0xDF = 223

0xFF = 255

This appendix lists the hexadecimal and binary equivalents of decimal numbers.
ModBus device addresses are entered in hexadecimal format. This table provides a
cross reference if only decimal addresses are known. Hexadecimal numbers are
shown in 0x00 format on the left. Decimal equivalents are shown on the right.
Refer to Table B-1. Decimal and binary equivalents are shown in Table B-2.

Table B-1. Hexadecimal and Decimal Equivalents

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

Appendix B iTrans Fixed Point Single/Dual Gas Monitor

Dec

Binary

Dec

Binary

Dec

Binary

Dec

Binary

0

00000000

64

01000000

128

10000000

192

11000000

1

00000001

65

01000001

129

10000001

193

11000001

2

00000010

66

01000010

130

10000010

194

11000010

3

00000011

67

01000011

131

10000011

195

11000011

4

00000100

68

01000100

132

10000100

196

11000100

5

00000101

69

01000101

133

10000101

197

11000101

6

00000110

70

01000110

134

10000110

198

11000110

7

00000111

71

01000111

135

10000111

199

11000111

8

00001000

72

01001000

136

10001000

200

11001000

9

00001001

73

01001001

137

10001001

201

11001001

10

00001010

74

01001010

138

10001010

202

11001010

11

00001011

75

01001011

139

10001011

203

11001011

12

00001100

76

01001100

140

10001100

204

11001100

13

00001101

77

01001101

141

10001101

205

11001101

14

00001110

78

01001110

142

10001110

206

11001110

15

00001111

79

01001111

143

10001111

207

11001111

16

00010000

80

01010000

144

10010000

208

11010000

17

00010001

81

01010001

145

10010001

209

11010001

18

00010010

82

01010010

146

10010010

210

11010010

19

00010011

83

01010011

147

10010011

211

11010011

20

00010100

84

01010100

148

10010100

212

11010100

21

00010101

85

01010101

149

10010101

213

11010101

22

00010110

86

01010110

150

10010110

214

11010110

23

00010111

87

01010111

151

10010111

215

11010111

24

00011000

88

01011000

152

10011000

216

11011000

25

00011001

89

01011001

153

10011001

217

11011001

26

00011010

90

01011010

154

10011010

218

11011010

27

00011011

91

01011011

155

10011011

219

11011011

28

00011100

92

01011100

156

10011100

220

11011100

29

00011101

93

01011101

157

10011101

221

11011101

30

00011110

94

01011110

158

10011110

222

11011110

31

00011111

95

01011111

159

10011111

223

11011111

32

00100000

96

01100000

160

10100000

224

11100000

33

00100001

97

01100001

161

10100001

225

11100001

34

00100010

98

01100010

162

10100010

226

11100010

35

00100011

99

01100011

163

10100011

227

11100011

36

00100100

100

01100100

164

10100100

228

11100100

37

00100101

101

01100101

165

10100101

229

11100101

38

00100110

102

01100110

166

10100110

230

11100110

39

00100111

103

01100111

167

10100111

231

11100111

40

00101000

104

01101000

168

10101000

232

11101000

41

00101001

105

01101001

169

10101001

233

11101001

42

00101010

106

01101010

170

10101010

234

11101010

43

00101011

107

01101011

171

10101011

235

11101011

44

00101100

108

01101100

172

10101100

236

11101100

45

00101101

109

01101101

173

10101101

237

11101101

46

00101110

110

01101110

174

10101110

238

11101110

47

00101111

111

01101111

175

10101111

239

11101111

48

00110000

112

01110000

176

10110000

240

11110000

49

00110001

113

01110001

177

10110001

241

11110001

50

00110010

114

01110010

178

10110010

242

11110010

51

00110011

115

01110011

179

10110011

243

11110011

52

00110100

116

01110100

180

10110100

244

11110100

53

00110101

117

01110101

181

10110101

245

11110101

54

00110110

118

01110110

182

10110110

246

11110110

55

00110111

119

01110111

183

10110111

247

11110111

56

00111000

120

01111000

184

10111000

248

11111000

57

00111001

121

01111001

185

10111001

249

11111001

58

00111010

122

01111010

186

10111010

250

11111010

59

00111011

123

01111011

187

10111011

251

11111011

60

00111100

124

01111100

188

10111100

252

11111100

61

00111101

125

01111101

189

10111101

253

11111101

62

00111110

126

01111110

190

10111110

254

11111110

63

00111111

127

01111111

191

10111111

255

11111111

Table B-2. Decimal and Binary Equivalents

  

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

iTrans Fixed Point Single/Dual Gas Monitor Appendix C

ORDERING MATRIX

Appendix

C

Base part number 7814635-ABCDEFG

Single or dual on-board or remote toxic, combustible and oxygen sensors with dual 4-20 mA outputs (one
per sensor) or ModBus RTU outputs. Remote sensor capable of operation up to 200 meters from main
transmitter. Operating temperature range –20C to +50C.

Example: 7814635-1C21241 =On-board LEL (4-20 mA scale 0-100) and remote mount H2S (4-20 mA scale 0-500)
with relays

A = Sensor 1 Configuration

E = Sensor 2 Configuration

B = Gas sensor 1

F = Gas sensor 2

C = 4-20 mA output scale for sensor 1

G = 4-20 mA output scale for sensor 2

D = Optional on-board relays

A - Sensor 1

E – Sensor 2

0 = No sensor

1 = Explosion Proof / On-board

1 = Explosion Proof / On-board

2 = Explosion Proof / Remote

2 = Explosion Proof / Remote

3 = Non-hazardous Remote/Duct
Mount

3 = Non-hazardous Remote/Duct
Mount

4 = Explosion Proof / On-board with
Splash Guard

4 = Explosion Proof / On-board with
Splash Guard

5 = Explosion Proof / Remote with
Splash Guard

5 = Explosion Proof / Remote with
Splash Guard

6 = Stainless Steel / On-board

7 = Stainless Steel / Remote

7 = Stainless Steel / Remote

B - Gas sensor 1

F - Gas sensor 2

1 = Carbon Monoxide (CO)

1 = Carbon Monoxide (CO)

2 = Nitric Oxide (NO)

2 = Nitric Oxide (NO)

3 = Ammonia (NH3)

3 = Ammonia (NH3)

4 = Hydrogen Sulfide (H2S)

4 = Hydrogen Sulfide (H2S)

5 = Sulfur Dioxide (SO2)

5 = Sulfur Dioxide (SO2)

6 = Nitrogen Dioxide (NO2)

6 = Nitrogen Dioxide (NO2)

7 = Chlorine (Cl2)

7 = Chlorine (Cl2)

8 = Chlorine Dioxide (ClO2)

8 = Chlorine Dioxide (ClO2)

9 = Hydrogen Cyanide (HCN)

9 = Hydrogen Cyanide (HCN)

A = Oxygen (O2)

A = Oxygen (O2)

B = LEL Infrared (obsolete)

B = LEL Infrared (obsolete)

C = LEL Catalytic Plug-In (factory

C = LEL Catalytic Plug-In (factory

This appendix provides an ordering matrix for the gas monitor.

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

Appendix C iTrans Fixed Point Single/Dual Gas Monitor

Pentane calibration)

Pentane calibration)

D = Carbon Monoxide – Hydrogen Null (CO –
H2)

D = Carbon Monoxide – Hydrogen Null (CO –H2)

F = Hydrogen Chloride (HCl)

F = Hydrogen Chloride (HCl)

G = LEL Infrared Propane (obsolete)

G = LEL Infrared Propane (obsolete)

K = Phosphine (PH3)

K = Phosphine (PH3)

L = Hydrogen (H2)

L = Hydrogen (H2)

C = 4-20 mA output scale for sensor 1

G = 4-20 mA output scale for sensor 2

0 = 0 - 999

0 = 0 - 999

1 = 0 - 500

1 = 0 - 500

2 = 0 - 100

2 = 0 - 100

3 = 0 - 50

3 = 0 - 50

4 = 0 - 30

4 = 0 - 30

5 = 0 - 10

5 = 0 - 10

6 = 0 - 2

6 = 0 - 2

7 = 0 - 1

7 = 0 - 1

8 = 0 - 20

8 = 0 - 20

9 = 0 - 200

9 = 0 - 200

D – Optional On-board Relays

0 = No Relay Module

1 = With Optional On-board Relays

  

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

iTrans Fixed Point Single/Dual Gas Monitor Appendix D

FACTORY DEFAULT

SETTINGS

Appendix

D

Sensor Name

Range

Resolution

Cal Gas

Default

Low

Alarm

Default

High

Alarm

CO

0-999 ppm

1 ppm

100 ppm

35 ppm

70 ppm

H2S

0-500 ppm

1 ppm

25 ppm

10 ppm

20 ppm

SO2

0-99.9 ppm

0.1 ppm

5 ppm

2.0 ppm

4.0 ppm

NO2

0-99.9 ppm

0.1 ppm

5 ppm

1.0 ppm

2.0 ppm

Cl2

0-99.9 ppm

0.1 ppm

10 ppm

0.5 ppm

1.0 ppm

ClO2

0-1.00 ppm

0.01 ppm

0.90 ppm

0.30 ppm

0.50 ppm

HCN

0-30.0 ppm

0.1 ppm

10 ppm

5.0 ppm

10.0 ppm

PH3

0-1.00 ppm

0.01 ppm

1.0 ppm

0.30 ppm

0.60 ppm

CO/H2 NULL

0-999 ppm

1 ppm

100 ppm

35 ppm

70 ppm

NO

0-999 ppm

1 ppm

25 ppm

25 ppm

50 ppm

NH3

0-500 ppm

1 ppm

25 ppm

25 ppm

50 ppm

HCl

0-30.0 ppm

0.1 ppm

10 ppm

5.0 ppm

10.0 ppm

H2

0-999 ppm

1 ppm

100 ppm

50 ppm

100 ppm

O2

0-30% Vol.

0.1% Vol.

20.9%

19.5%

23.5%

Infrared, LEL

0-100% LEL

1% LEL

50% LEL

10%LEL

20%LEL

Combustible, LEL

0-100% LEL

1% LEL

25% LEL

10%LEL

20%LEL

This appendix lists factory default settings based on the individual
sensor(s) used. Refer to Table D-1.

Table D-1. Factory Default Settings

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

  

Appendix D iTrans Fixed Point Single/Dual Gas Monitor

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

iTrans Fixed Point Single/Dual Gas Monitor Appendix E

EU DECLARATION OF

CONFORMITY CERTIFICATE

Appendix

E

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

Appendix E iTrans Fixed Point Single/Dual Gas Monitor

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

iTrans Fixed Point Single/Dual Gas Monitor Index

INDEX

Appendix

F

Index

Locator page numbers appear in regular type faces for standard index references
(e.g., 3-7). Boldface index references (e.g., 3-3) correspond to information found
in photos or illustrations. Italic index references (e.g., 3-3) correspond to
information found in tables.

#18 AWG........................................4-1, 4-4, 4-7, 5-17

120-Ohm terminating resistor ................................ 6-7

4-20 mA output(s) .. iii, 1-1, 1-2, 4-3, 5-1,, 5-11, 5-16,

8-1, 8-2, 8-3, C-1, C-2

changing upper range ...................................... 5-10

fault ................................................................... 5-2

fixed lower range ............................................ 5-10

not using............................................................ 4-4

abbreviations .......................................................... A-1

access code ............................................................ 5-8

accuracy ............................................................. ii, 2-2

acronyms................................................................ A-1

address

selection ............................................................ 1-2

setting ................................................................ 4-9

unique ............................................................... 6-1

agency approvals ................................................... 1-3

air flow................................................................... 3-1

alarm(s)

activation........................................................... 1-1

condition ............................................................. iii

date .................................................................... 5-4

horns ................................................................. 1-1

indication .......................................................... 5-2

month ................................................................ 5-4

over-range alarm ................................................. iii

relays ................................................................. 1-2

Numbers

A

capacity ........................................................ 1-2

wiring (J1, J5, J6) ......................................... 4-2

aluminum ............................................... 1-2, 2-1, 4-10

ammonia ........................................................ 1-3, C-1

analog signal ........................................................ 5-10

anticipated life ....................................................... 7-1

apply calibration gas .............................................. 5-6

arrow keys ........................ 5-9, 5-10, 5-11, 5-12, 5-13

atmospheric pressure ................................. iii, 1-2, 7-1

B

banana jacks ......................................................... 4-12

baud rate ................................................................ 6-1

BBIR ............................ 4-4, 5-1, 5-16, 5-17, 6-2, A-1

address ............................................................ 5-17

calibrating ....................................................... 5-16

calibration time ...................................... 5-16, 5-17

span reserve .................................................... 5-17

zero time ................................................ 5-16, 5-17

binary ............................................................. 4-9, A-1

blue jumper ............................................................ 6-7

broadband infrared ....................... 5-1, 5-16, 5-17, A-1

C

cable entry device .................................................. 2-5

calibration 1-1, 5-4, 5-6, 5-7, 5-14, 5-17, 6-4, 6-6, 7-1,

7-2, 8-1, 8-2, A-3, B-1

aborting ............................................................. 5-6

Index iTrans Fixed Point Single/Dual Gas Monitor

after alarms ......................................................... iii

BBIR sensor .................................................... 5-16

flow rate ................................................... 5-6, 5-15

frequency ............................................................ iii

span setting .............................................. 5-6, 5-15

time ................................................................. 5-17

BBIR .......................................................... 5-16

zeroing before ................................................. 5-14

carbon monoxide ............................. 1-3, 6-4, A-1,B-1

catalytic combustible gas sensors .............. iii,2-2, B-1

CH4 ....................................................................... A-1

change span ......................................................... 5-15

initiating ............................................................ 5-7

channel indicators ........................................... 5-3, 5-4

chlorine ........................................... 1-3, 6-4, A-1, B-1

chlorine dioxide ...................................... 1-3, 6-4, B-1

Cl2 ......................................................................... A-1

class I hazardous locations..................................... 1-3

classified locations ................................................. 4-2

ClO2 ...................................................................... A-1

clock settings .............................................. 5-16, 5-17

closing elements .................................................... 2-5

CO ........................................................................ A-1

column mounting ............................................ 3-1, 3-2

combustible gases ......................................... 2-3, A-2

commissioning ....................................................... 6-1

common problems ................................................. 8-1

conduit seal ............................................................ 2-5

configuration ................................................... 1-1, 2-3

dual sensor ................................................. 4-3, 4-4

Conformity Certificate, EC Declaration ................ E-1

connectors .............................................................. 2-4

control signal ......................................................... 1-1

control wire ............................................................ 4-1

countdown .. 5-5, 5-6, 5-7, 5-9, 5,10, 5-11, 5-12, 5-13,

5-14, 5-15

CSA approvals ....................................................... 1-3

C22.2 No. 152 compliance................................ 1-2

Std C22.2 No. 152-M1984 ................................ 1-3

Std C22.2 No. 213-M1987 ................................ 1-4

Std C22.2 No. 142-M1987 ................................ 1-3

Std C22.2 No. 30-M1986 .................................. 1-3

current draw ........................................................... 1-2

D

data bits ..................................................... 5-3,5-4, 6-1

decimals ................................................................. 5-3

Declaration of Conformity Certificate ................... E-1

decrement key ........................................................ 2-3

digital control systems ........................................... 1-1

digital controller .................................................... 4-9

digital ground ......................................................... 4-3

dimensions ............................................................. 2-2

DIP switch ....................................1-2, 4-9, 4-10, 4-12

location ............................................................. 4-9

setting addresses ............................................. 4-10

Directive 72/23/EEC .............................................. 1-4

Directive 92/31/EEC .............................................. 1-4

Directive 93/68/EEC .............................................. 1-4

Directive 94/9/EC .................................................. 1-4

display 1-2, 2-3, 5-1, 5-2, 5-3, 5-5, 5-6, 5-13, 5-14, 5-

16, 6-6, 8-2, A-1

specifications .................................................... 1-2

Distributed Control System (DCS) ....................... A-1

driving loads from relays ....................................... 4-2

dual-sensor ............................................. 4-4, 4-12, 5-9

dust-ignition-proof ................................................. 1-3

E

EC Declaration of Conformity Certificate ............. E-1

electrical risks ........................................................ 1-4

electrochemical diffusion....................................... 1-2

electromagnetic compatibility ............................... 1-4

electromagnetic interference .................................. 4-2

electronics module 2-4, 2-5, 4-1, 4-9, 4-10, 4-12, 8-1,

8-2

EMC Directive 89/336/EEC .................................. 1-4

emissions ............................................................... 3-1

EN 50014 ............................................................... 1-4

EN 50018 ............................................................... 1-4

EN 50270 ............................................................... 1-4

enclosure ..........................................1-2, 2-3, 3-1, 5-2

ground ............................................................... 4-3

screw .......................................................... 4-4, 4-7

shielding ..................................................... 4-2, 4-7

Energy Management Equipment ........................... 1-3

enter key ................................................................ 2-3

European ATEX Directive 94/9/EC ...................... 1-4

excess moisture ...................................................... 7-2

exhaust fan ............................................................. 4-2

explosion-proof ............................................... 1-2, 1-3

F

factory default .............................. 5-6, 5-10, 5 -15, B-1

fans ........................................................................ 1-1

fault code ........................................................ 5-1, 8-2

fault protection relay .............................................. 1-1

fault relay ........................................................ 1-2, 5-1

flashing ..................... 5-6, 5-7, 5-12, 5-13, 5-14, 5-15

flow rate ........................................................ 5-6, 5-15

four keys ................................................................ 2-3

function codes ........................................................ 8-3

function test, frequency ........................................... iii

functions, available .................................. 5-4, 5-8, 5-9

future functionality .............................................. 5-16

G

gas concentrations...................................... iii, 1-1, 5-2

lower than normal readings ................................. iii

gas reading ............................................... 6-1, 6-2, 6-6

gas sensor, combustible ........................................... iii

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

iTrans Fixed Point Single/Dual Gas Monitor Index

GND ..................................................................... A-1

green conductor ..................................................... 4-3

ground .............................................. 4-3, 4-9, 8-2, A-1

H

H2 ................................................................ ......... A-2

H2S ........................................................................ A-1

heat generating sources .......................................... 3-1

hexadecimal format ............................................... A-1

high alarm ....................... 5-1, 5-2, 5-16, 6-6, 8-3, D-1

relay .............................................4-2, 5-4, 6-6, 8-3

setpoint ............................................................ 5-10

threshold ........................................................... 4-2

high pressure .......................................................... 7-1

higher-power relay ................................................. 4-2

HMI ....................................................................... 4-9

housing ................................... 1-5, 2-1, 4-5, 4-12, 7-2

humidity ................................................................. 7-1

range ................................................................. 1-2

hydrogen ......................................... 1-3, 6-4, A-2, B-1

hydrogen chloride .................................................. 1-3

hydrogen cyanide ................................................... 1-3

hydrogen sulfide ................................................... A-2

I

increment key ........................................................ 2-3

infrared ............................. 1-2, 1-4, 2-2, 7-1, 9-1, D-1

calibration frequency .......................................... iii

input current, maximum ........................................ 1-2

input keys............................................................... 2-4

input voltage ................................................... 1-2, 8-1

installation ............................................................. 3-1

intrusive programming .......................................... 2-4

four keys ........................................................... 2-3

ISA S12.13 Part I-2000 ......................................... 1-3

J

jumpers ........................................................... 2-4, 6-7

K

KEMA 04 ATEX 2216X ................................ ....... 1-4

keypad ................................................. 5-13, 5-14, 7-2

keys ................................................................. 2-3, 2-4

L

LED display ............... 1-2, 2-3, 5-1, 5-5, 5-6, 5-7, 5-8,

5-9, 5-13, 5-14, 5-15, 5-16, 8-1

LEL sensors ...................................... iii, 1-2, 1-4, 5-8,

5-16, 6-3, 7-1, 9-1, C-1

life span ....................................................... iii, iv, 7-1

limitation of liability .............................................. 9-1

local authorities ..................................................... 4-1

low alarm ............................................. 5-1, 5-16, 6 -6,

8-3

relay ............................................4-2, 6-4, 6-6, 8-3

setpoint .............................................................. 5-9

threshold ........................................................... 4-2

low pressure ........................................................... 7-1

Lower Explosive Limit (LEL) ............................. A-2

M

magnetic wand ........... 1-1, 2-3, 5-2, 5-3, 5-4, 5-5, 5-6,

5-7, 7-2

main electronics unit .............................................. 2-1

maintenance ........................................................... 7-1

routine ............................................................... 7-1

master .................................................................... 6-1

message coding system .......................................... 6-1

methane................................................................. A-1

ModBus ......................................................... 6-1, A-1

address switch bank location ............................ 4-9

baud rate..................................................... 1-2, 6-1

characteristics ................................................... 6-1

commands ......................................................... 6-2

configuration ..................................................... 1-2

data bits ............................................................. 6-1

digital ground .................................................... 4-3

electrical standard ............................................. 6-1

message coding system ..................................... 6-1

number of devices ............................................. 1-2

parity bits .......................................................... 6-1

power wire ........................................................ 4-1

registers ............................................................. 6-2

resources ........................................................... 6-6

RTU ............................................ 1-1, 1-2, 4-9, B-1

signal wire ......................................................... 4-1

slave address ..................................................... 4-9

software protocol .............................................. 1-2

start bits ............................................................. 6-1

stop bits ............................................................. 6-1

terminating resistor ........................................... 6-7

transmission mode ............................................ 6-1

mode key ................................... 2-3,5-2, 5-5, 5-8, 6-1

mounting

holes .................................................................. 3-1

pipe or conduit .................................................. 3-1

N

NDIR ............................................................. 1-2, A-2

network .................................................................. 6-1

nitric oxide ............................................. 1-3, A-1, B-2

nitrogen dioxide .............................. 1-3, 6-4, A-1, B-2

NO2 ....................................................................... A-2

non-intrusive ............... 1-1, 2-3, 2-4, 5-2, 5-4, 5-5, 5-8

available functions ............................................ 5-4

non-latching ...................................................... iii, 4-2

normal mode ......................................................... A-2

Normal Operating Mode ... 5-1, 5-2, 5-5, 5-6, 5-7, 5-9,

5-10, 5-11, 5-12, 5-13, 5-14, 5-15

Normally Closed (NC) contact .............................. 4-2

Index iTrans Fixed Point Single/Dual Gas Monitor

Normally Open (NO) contact ................................ 4-2

NRTL laboratory ................................................... 1-3

O

O2 ................................................................ ......... A-2

open loop condition ............................................... 5-2

operating range ...................................................... 1-2

ordering matrix ...................................................... B-1

output wiring, J1 .................................................... 4-3

outputs ................................................................... 1-2

over-range

alarm ................................................................... iii

condition ........................................................... 5-2

oxygen ....................................... iii, 1-2, 1-3, 2-2, 6-3,

7-1, A-2, B-2

P

parity bits ............................................................... 6-1

password ................................................................ 5-8

phosphine ....................................................... 1-3, B-2

PLC ........................................................................ 4-9

poured wire seal ..................................................... 4-2

power ......................... 1-1, 4-1, 4-2, 4-3, 4-4, 4-7, 4-9,

4-12, 5-1, 5-16, 6-4, 7-2

AC and DC in same conduit ............................. 4-1

supply ......................................................... 1-1, 4-4

wire recommendations ...................................... 4-1

wiring, J1 .......................................................... 4-3

pressure .................................................................. 7-1

range ................................................................. 1-2

program mode ........................................................ 5-2

Programmable Logic Controller (PLC) ................ A-2

programming

access code ........................................................ 5-8

mode .........................................5-3, 5-4, 5-7, 5-10,

5-11, 5-12, 5-13, 5-15

protection class ...................................................... 2-2

protocol .................................................................. 6-6

public 485 GND .................................................... 4-3

pumps ............................................................. 1-1, 9-1

push button operation ............................................ 5-8

Q

qualified personnel .......................................... iv, 9-2

R

real time clock ............................. 5-16, 5-17, 6-5, A-2

reed switch ................................ 2-3, 2-4, 5-2, 5-4, 8-2

location ...................................................... 2-3, 2-4

register 40102 ........................................................ 6-1

register 40202 ........................................................ 6-2

relay board ...................................................... 1-1, 4-2

relays ................................................. iii, 1-1, 1-2, B-1

contact capacity................................................. 1-2

driving loads ..................................................... 4-2

non-latching ...................................................... 4-2

user-programmable ........................................... 1-2

remote sensor .................................................. 4-5, 4-6

Remote Terminal Unit (RTU) ....................... 6-1, A-2

remote unit ............................................................. 2-4

replacing sensors.................................................... 7-2

resistors .................................................................. 4-4

resolution ............................................................. 5-16

span gas concentration ...................................... 5-8

restart .................................................................... A-2

routine maintenance ............................................... 7-1

RS485 .................................................................... 1-2

S

safety ........................................................................iv

sealing device ........................................................ 1-5

secondary higher-power relay ................................ 4-2

self test ................................................................... 5-1

sensor(s) ............................ 1-4, 4-2, 4-4, 4-5, 4-7, 5-1,

5-17, 7-1, 7-2, 9-1

ATEX-certified ................................................. 1-4

board ................................................. 4-10, 6-1, 7-2

calibration service to ........................................... iii

catalytic ............................................................. 7-1

error .................................................................. 8-2

handling ............................................................ 7-1

head ................................................................... 4-4

maximum distance ................................... 4-4, 5-17

openings .............................................................. iii

ranges ................................................................ 1-3

remote ............................................... 4-2, 4-4, 5-17

replacement ....................................................... 7-2

span ............................................................ 5-2, 5-8

specifications .................................................... 2-2

storing ............................................................... 7-1

type ..................................................... 2-2, 5-4, 5-5

wiring, J3 .......................................................... 4-4

serial bus

abnormal behavior ............................................ 6-1

setpoint ................................................ 5-9, 5-10, 5-11

setting compound ................................................... 1-5

setup menu ............................................................. 5-5

shielded cable .................................4-1, 4-4, 4-7, 5-17

shielding .................................................. 4-2, 4-4, 4-7

screw ................................................................. 4-2

signal outputs ......................................................... 1-2

signal wire ............................................................. 4-3

recommendations .............................................. 4-1

silicone compound vapors ....................................... iii

silicone vapors ......................................................... iii

siren ....................................................................... 4-2

slave address .......................................................... 4-9

slave units .............................................................. 6-1

SMART sensor ...................................................... 8-2

error .................................................................. 5-2

SO2 ........................................................................ A-2

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

iTrans Fixed Point Single/Dual Gas Monitor Index

span gas .................................. 1-1, 5-2, 5-6, 5-15, 8-3

concentration ............. 1-1, 5-7, 5-8, 5-15, 5-16, 8-3

option ....................................................... 5-7, 5-15

value .................................................................. 5-4

span reserve .......................... 5-8, 5-16, 5-17, 7-3, 8-4

BBIR ............................................................... 5-17

span setting ................................................... 5-6, 5-15

span value ..................................................... 5-7, 5-15

aborting ........................................................... 5-16

changing ............................................................ 5-7

specifications .................................................. 1-1, 1-2

sensors............................................................... 2-2

splashguard ............................................................ 7-2

SPST relays ................................................... 1-2, A-2

stainless steel ......................................................... 1-2

standards

Canadian ........................................................... 1-3

US ..................................................................... 1-3

start bits ................................................................. 6-1

start-up ................................................................... 5-1

status bit .. 5-3, 5-4, 5-5, 5-6, 5-7, 5-8, 5-9, 5-10, 5-11,

5-12, 5-13, 5-14, 5-15, 5-16

flashing ...................................................... 5-6, 5-7

stop bits .................................................................. 6-1

strobe ..................................................................... 4-2

sulfur dioxide .......................................... 1-3, 6-4, A-2

switch bank

location ............................................................. 4-9

setting addresses ............................................. 4-10

T

technical support .................................................... 6-2

temperature ............................................................ 7-1

range ................................................................. 1-2

terminal blocks ............................................... 4-4, 4-5

terminating resistor ................................ ......... 4-6, 6-7

TIA/EIA-485 ......................................................... 6-1

time, setting ......................................................... 5-11

timers .................... 5-3, 5-5, 5-6, 5-7, 5-13, 5-14, 5-15

toxic ....................................................................... 1-2

transmission mode ................................................. 6-1

transmitter ............................................... 4-1, 5 -8, B -1

troubleshooting ...................................................... 8-1

U

U-bolts ............................................................ 3-1, 3-2

UL Std No. 1203 ................................ .................... 1-3

UL Std No. 1604 .................................................... 1-3

UL Std No. 916 ...................................................... 1-3

user-programmable relays ..................................... 1-2

V

vibrating sources .................................................... 3-1

W

wall mounting ................................................. 3-1, 3-2

warm-up period ..................................................... 5-1

warning lights ........................................................ 1-1

warranty ................................................................. 9-1

water ...................................................................... 7-2

windowed top ........................................ 4-1, 4-12, 5-8

wiring ...................................... 2-4, 4-1, 4-2, 4-5, 4-12

chassis ground ................................................... 4-1

colors ................................................................ 4-1

input sensors ..................................................... 4-1

supply power ..................................................... 4-1

terminals .................................................... 4-3, 4-4

wiring diagrams

dual on-board sensors ....................................... 4-7

dual remote sensors ........................................... 4-8

ModBus interface .............................................. 4-9

remote sensor .................................................... 4-6

remote sensors back to iTrans ........................... 4-8

single on-board sensor ...................................... 4-5

www.modbus.org............................................ 6-6, 6-7

Z

zero time ....................................................... 5-4, 5-17

BBIR ............................................................... 5-16

zero air ................................................................... 5-6

zeroing ............ 5-2, 5-3, 5-5, 5-6, 5-13, 5-14, 7-2, 8-3

error .................................................................. 8-2

two methods ...................................................... 5-3

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