Oldham iTrans 2 Operating instructions

FIXED POINT
SINGLE OR DUAL GAS MONITOR WITH
DUAL ANALOG OUTPUTS
Installation • Operation • Wiring • Troubleshooting
Part Number: 77036429-EN
Version: 01
Release Date: June 29, 2013

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© 2013 Industrial Scientific - Oldham. All rights reserved.
is a trademark of Industrial Scientific - 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.
Although every effort is made to ensure accuracy, the specifications of this
product and the content herein are subject to change without notice.
Industrial Scientific - Oldham
1001 Oakdale Road
Oakdale, PA 15071-1500
USA
Tel: [phone]
Toll Free: 1-800-DETECTS (1-800-338-3287)
Fax: [phone]
Service: 1-888-788-4353
Web: www.oldhamgas.com

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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.
The catalytic and IR sensors are factory configured to accurately
monitor the gas for which they are designated. It should be noted,
however, that the LEL sensors WILL respond to other combustible
gases and are not gas-specific.
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, Industrial
Scientific - 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.

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FOR IR SENSORS:
The output of the IR sensors can be disrupted by sudden changes in
temperature. If there is an excessive change in the ambient
temperatures, gas sample temperature or flow rate, then the output
signal will be momentarily frozen. Correct operation is restored when
the effects of the transient have settled. Rates of change in the ambient
temperature should be restricted to 2 °C/minute and gas flow rates kept
below 0.6 L/minute.
Extreme pressure variations will cause errors in readings. The unit
should be recalibrated if the atmospheric pressure change is greater
than 10% from the original pressure.
Do not expose the sensor to corrosive gases such as Hydrogen
Sulphide.
Do not allow condensation to occur inside the sensor.
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, Industrial Scientific - 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.

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Our Mission
Preserving human life: on, above and below the earth.
Delivering highest quality, best customer service…
every transaction, every time.
In practical terms, that means developing both portable instruments and
fixed-point systems for detecting, measuring and monitoring a wide variety
of gases, including toxic and combustible gases, as well as oxygen.
From research and development through final manufacturing, we never
forget that human lives depend on what we do. Workers all over the world
enter confined spaces, face the risk of asphyxiation, poisoning or explosion,
and depend on our instruments to ensure their safety. That's why every one
of our products is designed and manufactured with just one question in
mind: “Would you bet your life on it?”

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Contents
Chapter 1 | Overview............................................................11
Overview of the Gas Monitor .................................................. 11
Specifications .......................................................................................... 12
Agency Approvals - CSA......................................................................... 14
Chapter 2 | Hardware Overview...........................................15
Main Electronics Unit (Housing).............................................................. 15
Sensor ..................................................................................................... 16
Display..................................................................................................... 16
Inputs –Intrusive and Non-Intrusive........................................................ 17
Electronics Modules ................................................................................ 18
Chapter 3 | Installation.........................................................21
Introduction.............................................................................................. 21
Installation Considerations ...................................................................... 21
Wall Mounting.......................................................................................... 21
Column Mounting .................................................................................... 21
Chapter 4 | System Wiring...................................................23
Introduction.............................................................................................. 23
Wiring Preparation................................................................................... 23
Alarm Relay Wiring (J1, J5, and J6)........................................................ 24
Power and Output Wiring (J1)................................................................. 25
Sensor Wiring (J3)................................................................................... 26
Digital ModBus RTU Interface Wiring (J1) .............................................. 32
Wiring Conclusion.................................................................................... 36
Chapter 5 | Operation...........................................................37
Initial Start-up .......................................................................................... 37
Warm-up Period ...................................................................................... 37
Normal Operating Mode.......................................................................... 37
Programming Mode Overview................................................................. 39
Programming Mode –Non-intrusive Operation....................................... 40
Programming Mode –Push Button Operation ........................................ 44
Chapter 6 | Modbus Interface.............................................. 53
Introduction.............................................................................................. 53

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Sample Gas Reading via ModBus Network ............................................54
ModBus Register List...............................................................................54
ModBus Resources .................................................................................59
Termination..............................................................................................59
Chapter 7 | Maintenance...................................................... 61
Introduction..............................................................................................61
Sensor Replacement ...............................................................................62
Zero and Calibration ................................................................................62
Chapter 8 | Troubleshooting ............................................... 63
Introduction..............................................................................................63
Diagnosing Common Problems...............................................................63
Fault Codes..............................................................................................64
Function Codes........................................................................................64
Chapter 9 | Warranty............................................................ 67
Warranty ..................................................................................................67
Limitation of Liability ................................................................................67
Appendix A |HART Interface.................................................. 69
Introduction..............................................................................................69
Hardware Overview .................................................................................70
Installation................................................................................................71
System Wiring..........................................................................................71
Operation.................................................................................................76
HART Interface........................................................................................79
User Commands......................................................................................81
Appendix B |Acronyms and Abbreviations .......................... 87
Appendix C |Decimal, Binary, And Hex Equivalents............ 91
Appendix D |Ordering Matrix................................................. 95
Appendix E | Factory Default Settings................................... 99
Appendix F | Infrared Sensors............................................. 101
Appendix G |LEL Correlation Factors................................. 103

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Chapter 1 | Overview
Overview of the Gas Monitor
The fixed gas monitor is an
independent monitor capable of
displaying one or two gas
concentrations as well as sensor or
instrument specific diagnostics.
The 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. 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.
Figure 1-1 Typical Gas Monitor
with Single Gas Sensor (Stainless Steel
Option)

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Specifications
Specifications for the gas monitor are listed in Table 1-1.
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 x 153 x 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)
Input Current
(Max)
Toxic Gas/Oxygen
150 mA@24 VDC (single gas)
200 mA@24 VDC (single gas + HART)
Combustible
Gases (Catalytic)
250 mA@24 VDC, 0.8 A peak (single gas)
300 mA@24 VDC, 0.8 A peak (single gas + HART)
Combustible
Gases (Infrared)
170 mA@24 VDC, 0.5 A peak (single gas)
220 mA@24 VDC, 0.5 A peak (single gas + HART)
Combined
Catalytic/Infrared
350 mA@24 VDC, 1.2 A peak (two gas)
400 mA@24 VDC, 1.2 A peak (two gas + HART)
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
-40 ºC ~ +75 ºC (-40 ºF ~ +167 ºF)
Humidity
Range
10% - 90% RH (non-condensing), typical
Pressure
Atmospheric pressure ±10%
Weight
2.9 Kg (6.4 lbs.)
Table 1-1 Specifications for the Monitor

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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 - 200 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
Methane (by Vol, IR)
CH4
0 –100% Vol in 1% Vol increments
Methane (by LEL, IR)
CH4
0 –100% LEL in 1% increments
Propane (IR)
C3H8
0 –100% LEL in 1% increments
Propylene (IR)
C3H6
0 –100% LEL in 1% increments
Pentane (IR)
C5H12
0 –100% LEL in 1% increments
Butane (IR)
C4H10
0 –100% LEL in 1% increments
Ethylene (IR)
C2H4
0 –100% LEL in 1% increments
Ethanol (IR)
C2H6O
0 –100% LEL in 1% increments
Hexane (IR)
C6H14
0 –100% LEL in 1% increments
Carbon Dioxide (IR)
CO2
0 –0.50% Vol in 0.01% increments
Carbon Dioxide (IR)
CO2
0 –5.00% Vol in 0.01% increments
Carbon Dioxide (IR)
CO2
0 –100% Vol in 1% Vol increments
Table 1-2 Sensor Ranges

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Agency Approvals - CSA
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
oElectrical 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 (iTrans 2 with 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
CSA Std C22.2 No. 152-M1984-Combustible Gas Detection
Instruments (iTrans 2 with catalytic sensors only)
CSA Std C22.2 No. 213-M1987-Non-incendive Electrical Equipment
for Use in Class I, Division 2 Hazardous Locations
# # #

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Chapter 2 | Hardware Overview
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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Sensor
Item
Descriptions
Sensor Housing
Material
Aluminum, Anodized, Explosion-proof: Class I, Divisions 1 and 2
Groups B, C, D, and Ex d IICT6 Gb (China)
Aluminum, Anodized w/Gore-Tex Membrane (Division 2/Zone 2
toxics), Suitable for Class I, Division 2 Groups A, B, C, D
Dimensions
3.0 ×3.0 inches (76 ×76 mm)
Accuracy
< ±3% Toxic and Oxygen
For Combustibles:
For test gas concentrations up to and including 50% of full scale,
the deviation shall not exceed ±3% of full scale gas
concentration.
For test gas concentrations above 50% of full scale, the deviation
shall not exceed ±5% of full scale gas concentration.
Protection Class
IP 66 or NEMA 4X
Table 2-1 Sensor Specifications
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)

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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 magnetically-
activated 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.
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.

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

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Figure 2-5 Electronics Board for Remote Sensor
# # #

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