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Oldham iTrans User Manual

Fixed point single or dual gas monitor with dual analog outputs
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FIXED POINT SINGLE OR DUAL GAS MONITOR WITH DUAL

ANALOG OUTPUTS

iTrans
USER MANUAL
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

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  • Page 1: Analog Outputs

    FIXED POINT SINGLE OR DUAL GAS MONITOR WITH DUAL ANALOG OUTPUTS iTrans USER MANUAL 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...
  • Page 2 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.
  • Page 3  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.
  • Page 4 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.

  • Page 5: Table Of Contents

    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.
  • Page 6 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.

  • Page 7: Chapter 1: Introduction

    Fixed Point Single/Dual Gas Monitor Introduction Chapter NTRODUCTION 1.1. Overview of the Gas Monitor fixed gas monitor is an independent monitor capable displaying 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.
  • Page 8 Introduction iTrans Fixed Point Single/Dual Gas Monitor Table 1-1. Specifications for the Monitor Item Description Cast aluminum, poly-bonded coating or 316 stainless steel. Both are Enclosure explosion-proof, NEMA 4X, IP66 rated. 5.0  6.0  5.0 inches (127  153  129 mm)

  • Page 9: Agency Approvals - Csa

    Fixed Point Single/Dual Gas Monitor Introduction Table 1-2. Sensor Ranges Sensor Range/Resolution Combustible Gases 0 -100% LEL in 1% increments Hydrogen 0 - 999 ppm in 1 ppm increments Oxygen 0 - 30.0% by vol. in 0.1% increments Ammonia...
  • Page 10 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 Class I, Div 1, Groups B, C, D – AEx d IIB + H2 T5...
  • Page 11 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).  EC type examination certificate is KEMA 04 ATEX 2216X, with...

  • Page 12: Special Instructions For Safe Use (Eu)

    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.
  • Page 13 Fixed Point Single/Dual Gas Monitor Introduction (P/N: 77023554-1) iTrans User Manual...

  • Page 15: Chapter 2: Hardware Overview

    Fixed Point Single/Dual Gas Monitor Hardware Overview Chapter ARDWARE VERVIEW 2.1. Main Electronics Unit (Housing) 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.

  • Page 16: Sensor

    Hardware Overview iTrans Fixed Point Single/Dual Gas Monitor 2.2. Sensor Table 2-3. Sensor Specifications Descriptions Item Catalytic and Toxics Infrared (BBIR) Aluminum, Anodized Explosion-proof: Class I, Divisions 1 Stainless Steel and 2, Groups B, C, D and Ex d IIB...

  • Page 17: Display

    Fixed Point Single/Dual Gas Monitor Hardware Overview 2.3. Display 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.

  • Page 18: Electronics Modules

    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.
  • Page 19 Fixed Point Single/Dual Gas Monitor Hardware Overview Figure 2-4. Electronics Module for (Main Unit) Figure 2-5. Electronics Board for Remote Sensor    (P/N: 77023554-1) iTrans User Manual...
  • Page 20 Hardware Overview iTrans Fixed Point Single/Dual Gas Monitor (P/N: 77023554-1) iTrans User Manual...

  • Page 21: Chapter 3: Installation

    Fixed Point Single/Dual Gas Monitor Installation Chapter NSTALLATION 3.1. Introduction 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.
  • Page 22 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    (P/N: 77023554-1) iTrans User Manual...

  • Page 23: Chapter 4: System Wiring

    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.

  • Page 24: Alarm Relay Wiring (J1, J5, And J6)

    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.

  • Page 25: Power And Output Wiring (J1)

    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...

  • Page 26: Sensor Wiring (J3)

    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.
  • Page 27 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). , “485 B” on J3 should be NOTE: When wiring remote sensors to the connected to “B-”...
  • Page 28 System Wiring iTrans Fixed Point Single/Dual Gas Monitor Figure 4-4. Wiring Diagram for a Single On-board Sensor (P/N: 77023554-1) iTrans User Manual...
  • Page 29 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.
  • Page 30 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.
  • Page 31 Fixed Point Single/Dual Gas Monitor System Wiring Figure 4-7. Wiring Remote Sensors Back to Figure 4-8. Wiring Dual Remote Sensors (P/N: 77023554-1) iTrans User Manual...

  • Page 32: Digital Modbus Rtu Interface Wiring (J1)

    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.

  • Page 33: Setting The Modbus Address For Stand-Alone Sensors

    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.
  • Page 34 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 4-12 (P/N: 77023554-1) iTrans User Manual...

  • Page 35: Wiring Conclusion

    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). Chapter 6 for more information on the ModBus interface. (Note that DIP switches are pre-set at the factory for all dual-sensor units).

  • Page 37: Chapter 5: Operation

    Fixed Point Single/Dual Gas Monitor Operation Chapter PERATION 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.

  • Page 38: Normal Operating Mode

    Operation iTrans Fixed Point Single/Dual Gas Monitor 5.3. Normal Operating Mode 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.

  • Page 39: Programming Mode Overview

    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.

  • Page 40: Programming Mode - Non-Intrusive Operation

    Operation iTrans Fixed Point Single/Dual Gas Monitor Figure 5-5. Components of the Display Programming Mode – Non-intrusive Operation 5.5. 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...

  • Page 41: Sensor Type

    Fixed Point Single/Dual Gas Monitor Operation 5.5.2. Sensor Type enter non-intrusive operation during the Normal Operating Mode, place the magnetic wand over the CH1 designation. will display the sensor type for channel 1 for 5 seconds then enter in the Zero Menu.

  • Page 42: Calibration

    Operation iTrans Fixed Point Single/Dual Gas Monitor 5.5.4. Calibration 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...

  • Page 43: Changing Span Gas Concentration

    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...

  • Page 44: Sensor Span Reserve

    Operation iTrans Fixed Point Single/Dual Gas Monitor 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 The last option available is viewing the sensor span reserve.

  • Page 45: Entering Programming Mode And Selecting A Channel

    Fixed Point Single/Dual Gas Monitor Operation 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...

  • Page 46: Set High Alarm

    Operation iTrans Fixed Point Single/Dual Gas Monitor 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.

  • Page 47: Set System Time - Minute

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

  • Page 48: Set System Time - Hour

    Operation iTrans Fixed Point Single/Dual Gas Monitor 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 The system’s clock hour setting is...

  • Page 49: Set System Time - Month

    Fixed Point Single/Dual Gas Monitor Operation 5.6.9. Set System Time – Month system’s month setting designated with an “E” in the status bit and current value next to it. change the month, press the “” button during 10-second countdown. If you do not press “”...

  • Page 50: Calibration

    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.

  • Page 51: Changing Span Gas Concentration

    Fixed Point Single/Dual Gas Monitor Operation 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.

  • Page 52: Sensor Span Reserve

    Operation iTrans Fixed Point Single/Dual Gas Monitor 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.
  • Page 53 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.
  • Page 54 Operation iTrans Fixed Point Single/Dual Gas Monitor 5-18 (P/N: 77023554-1) iTrans User Manual...

  • Page 55: Chapter 6: Modbus Interface

    Fixed Point Single/Dual Gas Monitor ModBus Interface Chapter NTERFACE 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).

  • Page 56: Modbus Register List

    ModBus Interface iTrans Fixed Point Single/Dual Gas Monitor 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.
  • Page 57 Fixed Point Single/Dual Gas Monitor ModBus Interface Inst Host Addr Range Description 40103 MSB = $01 to $FF Gas Type LSB = $01 to $FF 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.
  • Page 58 ModBus Interface iTrans Fixed Point Single/Dual Gas Monitor Inst Host Addr Range Description 40105 $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...
  • Page 59 Fixed Point Single/Dual Gas Monitor ModBus Interface Inst Host Addr 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 Last Alarm Date (00yy) Holds the last two digits of the year when the instrument was last in alarm.

  • Page 60: Modbus Resources

    ModBus Interface iTrans Fixed Point Single/Dual Gas Monitor Inst Host Addr 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...

  • Page 61: Termination

    “public” jumper that can be used details). The 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 ...
  • Page 62 ModBus Interface iTrans Fixed Point Single/Dual Gas Monitor (P/N: 77023554-1) iTrans User Manual...

  • Page 63: Chapter 7: Maintenance

    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.

  • Page 64: Sensor Replacement

    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.

  • Page 65: Chapter 8: Troubleshooting

    Fixed Point Single/Dual Gas Monitor Troubleshooting Chapter ROUBLESHOOTING 8.1. Introduction This chapter provides troubleshooting information for the gas monitor. 8.2. Diagnosing Common Problems Table 8-1. Common Problems Symptom Problem Solution Input voltage is too low LED display does not Check for presence of input light up.

  • Page 66: Fault Codes

    Troubleshooting iTrans Fixed Point Single/Dual Gas Monitor Symptom Problem Solution Replace sensor and Reading drifts by 10 Sensor has failed calibrate. counts over a short time period (in a Electronics module has stable temperature Replace electronics module failed environment) and calibrate.

  • Page 67: Function Codes

    Fixed Point Single/Dual Gas Monitor Troubleshooting 8.4. Function Codes Table 8-3. Function Codes LED Display Function Description Status Code Data Area Low Alarm Set the relay low alarm value High Alarm Set the relay high alarm value Range of 4-20 mA Set the range of 4-20 mA output Set system time –...
  • Page 68 Troubleshooting iTrans Fixed Point Single/Dual Gas Monitor (P/N: 77023554-1) iTrans User Manual...

  • Page 69: Chapter 9: Warranty

    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.
  • Page 70 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;...

  • Page 71: Appendix A: Acronyms And Abbreviations

    Fixed Point Single/Dual Gas Monitor Appendix A Appendix CRONYMS AND BBREVIATIONS This appendix contains acronyms and abbreviations that are used within this document. Table A-1. Acronyms and Abbreviations Abbr Definition Ampere acrylonitrile butadiene styrene ASCII American Standard Code for Information Interchange...
  • Page 72 Appendix A iTrans Fixed Point Single/Dual Gas Monitor Abbr Definition hydrogen hydrogen sulfide hydrogen chloride hydrogen cyanide light emitting diode lower explosive limit (combustible gases) least significant bit milliampere millimeter most significant bit normally closed NDIR non-dispersive infrared NEMA National Electrical Manufacturers Association...
  • Page 73 Fixed Point Single/Dual Gas Monitor Appendix B Appendix ECIMAL INARY EXADECIMAL QUIVALENTS 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.
  • Page 74 Appendix B iTrans Fixed Point Single/Dual Gas Monitor Table B-2. Decimal and Binary Equivalents Binary Binary Binary Binary 00000000 01000000 10000000 11000000 00000001 01000001 10000001 11000001 00000010 01000010 10000010 11000010 00000011 01000011 10000011 11000011 00000100 01000100 10000100 11000100 00000101 01000101...
  • Page 75 Fixed Point Single/Dual Gas Monitor Appendix C Appendix RDERING ATRIX This appendix provides an ordering matrix for the gas monitor. 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.
  • Page 76 Appendix C iTrans Fixed Point Single/Dual Gas Monitor Pentane calibration) Pentane calibration) D = Carbon Monoxide – Hydrogen Null (CO – D = Carbon Monoxide – Hydrogen Null (CO –H2) F = Hydrogen Chloride (HCl) F = Hydrogen Chloride (HCl)
  • Page 77 Fixed Point Single/Dual Gas Monitor Appendix D Appendix ACTORY EFAULT ETTINGS This appendix lists factory default settings based on the individual sensor(s) used. Refer to Table D-1. Table D-1. Factory Default Settings Default Default Sensor Name Range Cal Gas...
  • Page 78 Appendix D iTrans Fixed Point Single/Dual Gas Monitor (P/N: 77023554-1) iTrans User Manual...
  • Page 79 Fixed Point Single/Dual Gas Monitor Appendix E Appendix EU D ECLARATION OF ONFORMITY ERTIFICATE (P/N: 77023554-1) iTrans User Manual...
  • Page 80 Appendix E iTrans Fixed Point Single/Dual Gas Monitor (P/N: 77023554-1) iTrans User Manual...
  • Page 81 Fixed Point Single/Dual Gas Monitor Index Appendix NDEX 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.
  • Page 82 Index iTrans Fixed Point Single/Dual Gas Monitor after alarms ............iii Directive 72/23/EEC ..........1-4 BBIR sensor ............ 5-16 Directive 92/31/EEC ..........1-4 flow rate ........... 5-6, 5-15 Directive 93/68/EEC ..........1-4 frequency ............iii Directive 94/9/EC ..........1-4 span setting ..........5-6, 5-15 display 1-2, 2-3, 5-1, 5-2, 5-3, 5-5, 5-6, 5-13, 5-14, 5- time ..............
  • Page 83 Fixed Point Single/Dual Gas Monitor Index GND ..............A-1 setpoint .............. 5-9 green conductor ............. 4-3 threshold ............4-2 ground ..........4-3, 4-9, 8-2, A-1 low pressure ............7-1 Lower Explosive Limit (LEL) ......A-2 ................. A-2 S ................ A-1 magnetic wand ...
  • Page 84 Index iTrans Fixed Point Single/Dual Gas Monitor Normally Open (NO) contact ........ 4-2 non-latching ............4-2 NRTL laboratory ........... 1-3 user-programmable ........... 1-2 remote sensor ..........4-5, 4-6 Remote Terminal Unit (RTU) ....... 6-1, A-2 remote unit ............. 2-4 ................. A-2 replacing sensors............
  • Page 85 ............. 4-9 dual remote sensors ........... 4-8 setting addresses ..........4-10 ModBus interface ..........4-9 remote sensor ............ 4-6 remote sensors back to iTrans ......4-8 technical support ............ 6-2 single on-board sensor ........4-5 temperature ............7-1 www.modbus.org..........6-6, 6-7 range ..............
  • Page 88 The Fixed Gas Detection Experts EUROPEAN PLANT AND OFFICES Z.I. Est – rue Orfila CS 20417 – 62027 Arras Cedex FRANCE Tel: +33 (0)3 21 60 80 80 – Fax: +33 (0)3 21 60 80 00 Website: http://www. .com oldhamgas AMERICAS ASIA PACIFIC EUROPE...

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