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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
© 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: +1 412-788-4353
Toll Free: 1-800-DETECTS (1-800-338-3287)
Fax: +1 412-788-8353
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
Overview ............................................................ 11
Overview of the Gas Monitor .................................................. 11
Agency Approvals - CSA ......................................................................... 14
Hardware Overview ........................................... 15
Main Electronics Unit (Housing) .............................................................. 15
– Intrusive and Non-Intrusive ........................................................ 17
Installation ......................................................... 21
System Wiring ................................................... 23
Alarm Relay Wiring (J1, J5, and J6) ........................................................ 24
Power and Output Wiring (J1) ................................................................. 25
Digital ModBus RTU Interface Wiring (J1) .............................................. 32
Operation ........................................................... 37
Normal Operating Mode .......................................................................... 37
Programming Mode Overview ................................................................. 39
– Non-intrusive Operation ....................................... 40
– Push Button Operation ........................................ 44
Modbus Interface .............................................. 53
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Sample Gas Reading via ModBus Network ............................................ 54
Maintenance ...................................................... 61
Troubleshooting ............................................... 63
Diagnosing Common Problems ............................................................... 63
Warranty ............................................................ 67
HART Interface .................................................. 69
Acronyms and Abbreviations .......................... 87
Decimal, Binary, And Hex Equivalents ............ 91
Ordering Matrix ................................................. 95
Factory Default Settings ................................... 99
Infrared Sensors ............................................. 101
LEL Correlation Factors ................................. 103
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Chapter 1 | Overview
Overview of the
The fixed gas monitor is an independent monitor capable of displaying one or two gas concentrations as well as sensor or instrument specific diagnostics.
Gas Monitor
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 nonintrusive 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
Dimensions
Sensors
Cast aluminum, poly-bonded coating or 316 stainless steel. Both are explosion-proof, NEMA 4X, IP66 rated.
5.0 × 6.0 × 5.0 inches (127 x 153 x 129 mm)
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)
Toxic Gas/Oxygen
150 mA@24 VDC (single gas)
200 mA@24 VDC (single gas + HART)
Input Current
(Max)
Combustible
Gases (Catalytic)
Combustible
Gases (Infrared)
Combined
Catalytic/Infrared
250 mA@24 VDC, 0.8 A peak (single gas)
300 mA@24 VDC, 0.8 A peak (single gas + HART)
170 mA@24 VDC, 0.5 A peak (single gas)
220 mA@24 VDC, 0.5 A peak (single gas + HART)
350 mA@24 VDC, 1.2 A peak (two gas)
400 mA@24 VDC, 1.2 A peak (two gas + HART)
Display
Signal
Outputs
Alarm Relays
Dual-channel split-screen LED display (4-digit, 7-segment arrangement per channel) provides simultaneous display of one or two gases.
Digital
Analog
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.
4-20 mA (linear analog)
Quantity
Contact Capacity
3 alarm relays: Two user-programmable relays, SPST, N.O.; plus one fault relay,
SPST, N.C.
5A @ 30 VDC
5A @ 30 VAC
Temperature
Range
Humidity
Range
Pressure
-40 ºC ~ +75 ºC (-40 ºF ~ +167 ºF)
10% - 90% RH (non-condensing), typical
Atmospheric pressure ±10%
Weight 2.9 Kg (6.4 lbs.)
Table 1-1 Specifications for the Monitor
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Sensor
Combustible Gases
Hydrogen
Oxygen
Ammonia
Carbon Monoxide
Carbon Monoxide/H2 Null
Hydrogen Sulfide
Sulfur Dioxide
Hydrogen Cyanide
Hydrogen Chloride
Phosphine
Nitrogen Dioxide
Nitric Oxide
Chlorine
Chlorine Dioxide
Methane (by Vol, IR)
Methane (by LEL, IR)
Propane (IR)
Propylene (IR)
Pentane (IR)
Butane (IR)
Ethylene (IR)
Ethanol (IR)
Hexane (IR)
Carbon Dioxide (IR)
Carbon Dioxide (IR)
Carbon Dioxide (IR)
Gas
LEL
H2
O2
NH3
CO
CO
Range/Resolution
0 -100% LEL
0 - 999 ppm in 1% in 1 ppm
0 - 30.0% by vol in 0.1%
0 - 200 ppm in 1 ppm
0 - 999 ppm
0 - 999 ppm in 1 ppm in 1 ppm increments increments increments increments increments increments
0 - 500 ppm in 1 ppm increments
0.2 - 99.9 ppm in 0.1 ppm increments
H2S
SO2
HCN
HCl
PH3
NO2
NO
Cl2
ClO2
CH4
0.2 – 30.0 ppm in 0.1 ppm increments
0.2 - 30.0 ppm in 0.1 ppm increments
0 - 1.00 ppm
0.2 - 99.9 ppm in 0.01 ppm increments in 0.1 ppm increments
0 - 999 ppm in 1 ppm increments
0.2 - 99.9 ppm in 0.1 ppm increments
0.02 - 1.00 ppm
0 – 100% Vol
CH4 0 – 100% LEL
C3H8 0 – 100% LEL in 0.01 ppm increments in 1% Vol in 1% in 1% increments increments increments
C3H6 0 – 100% LEL
C5H12 0 – 100% LEL
C4H10 0 – 100% LEL
C2H4 0 – 100% LEL in 1% in 1% in 1% in 1% increments increments increments increments
C2H6O 0 – 100% LEL
C6H14 0 – 100% LEL
CO2
CO2
CO2
0 – 0.50% Vol
0 – 5.00% Vol
0 – 100% Vol in 1% in 1% in 0.01% in 0.01% in 1% Vol increments increments increments increments 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
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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 (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
Sensor Housing
Material
Descriptions
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
Accuracy
3.0 × 3.0 inches (76 × 76 mm)
< ± 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
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Figure 2-2 The Display (Dual-Gas Monitor Shown)
Inputs – Intrusive and Non-Intrusive
The gas monitor can be configured using intrusive and nonintrusive 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
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 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
Figure 2-4 Electronics Module for (Main Unit)
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Figure 2-5 Electronics Board for
# # #
Remote Sensor
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Chapter 3 | Installation
Introduction
The can be mounted in one of two ways. The unit can be wallmounted 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.
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 heat generating sources.
gas monitor must not be installed on vibrating or
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.
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.
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Figure 3-1 Mounting the Gas Monitor on a Wall
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Figure 3-2 Mounting the Gas Monitor on a Column Using U-Bolts
Chapter 4 | System Wiring
Introduction
This chapter outlines the steps required for wiring the
These steps include the following:
Wiring Preparation
gas monitor.
Power and Output Wiring
Sensor Wiring
Alarm Relay 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 ISC).
Wiring Preparation
1. Collect the appropriate types and lengths of wire.
For control wire, use #18 AWG (0.9 mm²) insulated, shielded cable.
For analog signal and power wire, use three-conductor (or fourconductor for dual channel) #18 AWG (0.9 mm²) insulated and shielded cable.
For digital ModBus signal and power, use a minimum of fiveconductor #18 AWG (0.9 mm²) 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.
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5. Thread control, signal, and power wires into the transmitter housing.
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 90°C must be used for interconnection to the .
NOTE: For classified locations, a “poured” wire seal must be installed within
18 inches (457mm) of the main unit for both power entry and remote sensors.
NOTE: Remove power from the connections.
before making any wiring
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 nonlatching, 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 (NC) 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, higherpower relay which is connected to the control device (e.g., strobe, siren, exhaust fan, etc.).
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Figure 4-1 Alarm Relay Connectors J6, J5 and J1
Power and Output Wiring (J1)
Connect the terminals as follows.
power and signal wires to the appropriate wiring
24 V: Connect 24 VDC (12-28 VDC) supply power
CH 1:
CH 2:
GND:
Channel 1, 4-20 mA output signal
Channel 2, 4-20 mA output signal
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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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.
Sensor Wiring (J3)
Connect the sensor wires (for on-board, remote or stand-alone) to the appropriate wiring terminals as follows.
24 V:
485A:
485B:
GND:
Red wire from sensor head
Yellow wire from sensor head
Black wire from sensor head
Green wire from sensor head
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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NOTE: Use #18 AWG (0.9 mm²) shielded cable for remote sensors. Maximum distance is 200 meters.
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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Figure 4-4 Wiring Diagram for a Single On-board Sensor
J1
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 J1 may need to be moved to terminals 1-2.
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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 J1 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 (0.9 mm²) insulated and shielded cable.
Shielding from either the controller or remote sensors should be bonded to the enclosure screw located inside the .
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Figure 4-6 Wiring Diagram for Dual On-board Sensors
Figure 4-7 Wiring Remote Sensors Back to
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Figure 4-8 Wiring Dual Remote Sensors
Digital ModBus RTU Interface Wiring (J1)
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
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signals are wired into the RS485A and RS485B terminals on the board. See
Figure 4-9 Wiring Diagram for the ModBus Interface
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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Figure 4-11 Setting the ModBus Address (Example Address of 240 Decimal)
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 10 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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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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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).
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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Chapter 5 | Operation
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.
Warm-up Period
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
Figure 5-1 Sample Fault Code Display
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.
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
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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 4-20mA fault occurs, either a “P” indicating an open loop, or an “U” indicating 4-20 over-range will be present. From the Normal
Operating Mode, the can enter into the program mode in one of two ways.
Figure 5-3 Sample Low and High Alarm
Displays
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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Figure 5-4 Locations of Reed Switches and Push Buttons
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 nonintrusively 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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Figure 5-5 Components of the Display
Programming Mode – Non-intrusive Operation
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 nonintrusive 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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Sensor Type
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.
NOTE: If you want to operate channel 2, place the magnetic wand on CH2 first to enter the setup menu.
Figure 5-6 Sample Display Entering
Non-Intrusive Mode
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.
Zeroing
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 10-second countdown, the will return to the Normal Operating Mode. To abort zeroing at any time, place the magnatic wand over CH1.
Figure 5-7 Sample Zeroing Display
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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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 calibration, place the magnetic wand over CH2 during the
10-second countdown. If you do not initiate calibration during the 10second 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
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.
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.
NOTE: Check and verify span setting before starting a calibration.
NOTE: See Appendix D for a complete list of factory default span gases.
Figure 5-9 Sample Zeroing Display
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Figure 5-10 Apply CalGas Display
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.
Changing Span Gas Concentration
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 10second 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 now be changed.
span value can
Figure 5-11 Sample Span Gas
Concentration Display
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 5-12 Flashing Status Bit
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.
43
Sensor Span Reserve
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
Programming Mode – Push Button Operation
Introduction
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”. 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
Figure 5-14 Sample Enter Password
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.
44
Entering Programming Mode and Selecting a Channel
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
NOTE: If you have a dual-sensor unit, use the “Mode” button to switch between the channel.
45
Set Low Alarm
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 using the “↑” and “↓” keys.
Figure 5-16 Sample Low Alarm Setpoint
Display
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 back to the Programming Mode.
will go
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 10second 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.
Figure 5-17 Sample High Alarm Setpoint
Display
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.
46
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.
NOTE: Only the upper end range can be changed. The low end is always set for 4 mA.
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
Set System Time – Minute
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)
When the desired value is reached, press the “ ” key. If the value is not saved before the time-out, the
Mode.
will go back to the Programming
47
Set System Time – Hour
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 10-second 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. When the desired value is reached, press the “ ” key. If the value is not saved before the time-
Set System Time – Date
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 10-second 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. When the desired value is reached, press the “ ” key. If the value is not saved before the timeout, the will go back to the
Programming Mode.
Figure 5-20 Setting System Time (Hour) out, the will go back to the
Programming Mode.
Figure 5-21 Setting System Date
Set System Time – Month
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.
48
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. 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 5-22 Setting System Month
Zeroing
Zeroing is an option available both through the keypad and nonintrusively. 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, press the “ ” key during the 10second 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 5-23 Sample Zeroing Display
Calibration
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 10second 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 5-24 Sample Calibration Display
49
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, 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.
Changing 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, 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.
50
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. 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.
NOTE: If the “ ” key is not pressed, the new span value will not be saved.
Figure 5-25 Sample Span Gas
Concentration Display
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.
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 5-26 Flashing Status Bit
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 5-27 Sample Span Reserve
Display
51
52
Chapter 6 | Modbus Interface
Introduction
IMPORTANT: The device with public Modbus interface can also be configured to operate with a MX43 controller from Oldham. Please follow the procedure given below to enable MX43-compatibility mode on .
Set the Modbus ID of using
dip-switches as shown in Figure
according to MX43 configuration (for details please see the user manual of MX43 controller).
The MX43-compatibility menu on
is password protected. To enter MX43-compatibility menu, remove the front cover of and press “Enter” key. The access code is “Enter”, “Up”, “Down”,
“Up”, “Mode”.
Figure 6-1 MX43-compatibilty Menu
Once the correct access code has been entered then the user can select to enable (1) or disable (0) the MX43-compatibility mode on using “Up” or “Down” key then the selection is confirmed by pressing the “Enter” key.
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
Characteristic
Hardware
Baud Rate
Electrical Standard
Transmission Mode
Message Coding System
Start Bits
Data Bits
Parity Bits
Stop Bits
are listed below.
Description
2-wire mode (not 4-wire)
9600
TIA/EIA-485
RTU mode (not ASCII)
8-bit
1
8 (LSB sent first)
0
1
Table 6-1 ModBus Characteristics for the Gas Monitor
53
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.
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.
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.
ModBus Register List
ModBus register addresses are provided in Table 6-1.
Addr
40101
40102
Inst
R/W
Host
R/W
Range
R/W R/W
W R
Description
MSB = $01 to
$FF
LSB = $01 to
$F7
$0000 to $FFFF
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 = IR (infrared)
$04 = TOX (toxic)
$05 = OXY (oxygen)
$06 = AAW (toxic)
$07 = CAT (catalytic)
LSB = MODBUS sensor address $01 to
$F7 (1 to 247)
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.
54
Addr
40103
Inst
R/W
R*
Host
R/W
R*
Range
MSB = $01 to
$FF
LSB = $01 to
$FF
Description
Examples:
+5 ppm = register value of 00005
10
= $0005
-5 ppm = register value of 65531
10
= $FFFB
$02
$03
$04
$05
$06
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
$07
$08
$09
$0B
$0C
H
2
S
SO
2
NO
2
Cl
2
ClO
2
HCN
PH
3
H
2
CO
2
NO
Hydrogen Sulfide
Sulfur Dioxide
Nitrogen Dioxide
Chlorine
Chlorine Dioxide
Hydrogen Cyanide
Phosphine
Hydrogen
Carbon Dioxide
Nitric Oxide
$0D
$0E
$14
$15
$16
NH
3
HCl
O
2
CH
4
LEL
Ammonia
Hydrogen Chloride
Oxygen
Methane
Lower Explosive Limit
$17
$1A
(Combustible Gases)
C
6
H
14
Hexane
C
5
H
12
Pentane
$1B
$4D
C
3
H
8
C
2
H
4
Propane
C
2
H
6
O Ethanol
Ethylene $50
$6F
$C9
C
3
H
6
Propylene
C
4
H
10
Butane
Examples:
55
Addr
40105
40106
Inst
R/W
W
W
Host
R/W
Range
R/W $0000 to $FFFF
R $0000 to $FFFF
Description
$0107 = 1 decimal place for gas type HCN
$0002 = 0 decimal places for gas type H
2
S
$0206 = 2 decimal places for ClO
2
Instrument Mode
Holds code for current mode of instrument. Possible working modes of instrument are listed below.
$0001
$0002
$0003
$0006
$0008
Normal
Calibration
Warm-up
Zeroing
Fault
$0009
Examples:
Reset
Sensor in zero fault = $0008
Sensor zeroing = $0006
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
Bit 14
Bit 13
= current loop open
= current loop shorted
= power fault
Bit 12
Bit 11
Bit 10
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
= 5 volt fault
= missing sensor
=
(not defined)
= configuration fault
= zero fault
= calibration fault
= over-range
= failed sensor
= high alarm
Bit 0
Examples:
= low alarm
Missing sensor = Bit 11 is set
$0800
Power fault and failed sensor = Bits 13 and 2 set
$2004
=
=
56
Addr
40115
40116
40117
40118
Inst
R/W
Host
R/W
Range
W
W
R
R
Description
R
R
R/W
R/W
MSB=$01
$0C, to
LSB=$01 to $1F
$0002 to $0063
Last Alarm Date (mmdd)
Holds the month and day when the instrument had the last alarm.
High byte = $01 to $0C
Low byte = $01 to $1F
Examples:
Dec 25 is represented as $0C19
June 31 is represented as $061F
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
$63
= $00, Low byte = $02 to
Examples:
2002 is represented by $02
2099 is represented by $63
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
June 30
= $0C19
= $061E
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 twodigit year (within the 21 st
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) =
57
Addr
Inst
R/W
Host
R/W
Range Description
40119
40124
40125
40126
40127
R
R
R
R
R/W
R/W
R/W
R/W
R/W R
MSB=$00 to
$18, LSB=$00 to
$3C
$0000 to $FFFF
$0000 to $FFFF
$0000 to $03E8
$0000 to $FFFF
$0063
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 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
Low Alarm Display Setting
Holds the value of the gas reading at which the low alarm display will activate.
High Alarm Display Setting
Holds the value of the gas reading at which the high alarm display will activate.
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 1000
10
).
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.
Table 6-2 ModBus Registers
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.
58
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.
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. Industrial Scientific - Oldham does not recommend changing the placement of any of the other jumpers on this board.
Figure 6-2 Location of Jumpers
# # #
59
60
Chapter 7 | Maintenance
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 sensors have a MTBF greater than 5 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, Industrial Scientific - 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 maintenance.
require no other routine
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.
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.
61
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.
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.
# # #
62
Chapter 8 | Troubleshooting
Introduction
This chapter provides troubleshooting information for the monitor.
gas
Diagnosing Common Problems
Symptom
LED display does not light up.
Output
4-20 mA range outside
Problem
Input voltage is too low
Electronics module has failed
Unit in calibration mode
Electronics module has failed
Solution
Check for presence of input voltage.
Exit calibration mode.
Replace electronics module.
Output does not change when gas concentration changes
Electronics has failed module
Cannot
SPAN
Reed Switch does not work
“P” appears on the display calibrate
In calibration, LED displays wrong value.
Sensor has failed
Electronics module has failed
Reading drifts by 10 counts over a short time period (in a stable temperature environment)
Sensor has failed
Electronics module has failed
Sensor has failed
Electronics module has failed
Electronics module has failed
Reed Switch is damaged
Open loop on a 4-20 mA channel
Replace electronics module.
Replace sensor and calibrate.
Replace electronics module and calibrate.
Replace sensor and calibrate.
Replace electronics module and calibrate.
Replace sensor and calibrate.
Replace electronics module and calibrate.
Replace electronics module and calibrate.
Replace the reed switch.
Place a 100-Ohm load resistor from the mA output pin to
63
Symptom Problem Solution ground.
“U Or” appears on the display
4-20 mA signal goes into over range for about 5 seconds before settling at
1mA
Ensure the sensor is working properly via a second ary gas detection source and the 4-20 mA is scaled correctly.
Table 8-1 Common Problems
Fault Codes
Fault
Display
0.FFF
C.FFF
1.FFF
2.FFF
U-Or
U Or
Status Bit
Flashing
Flashing
Flashing
Flashing
Flashing
Flashing
4-20 mA Output
1 mA
1 mA
1 mA
1 mA
1mA
22mA for ~5 seconds then settled at 1mA
Table 8-2 Fault Codes
Description
Zeroing error – Recover after calibrating
Calibration error – Recover after calibrating or replacing the sensor
SMART sensor error
Sensor error
Sensor under-range
Sensor over-range
4
1
H
D
E
8
0
C
64
Function Codes
Function
Code
L
H
LED Display
Status
Bit
L.
H.
Data Area
Low Alarm
High Alarm
4.
1. h. d.
E.
8.
0.
C.
Range of 4-20 mA
Minute
Hour
Date
Month
Year
Description
Set the relay low alarm value
Set the relay high alarm value
Set the range of 4-20 mA output
Set system time – minute
Set system time – hour
Set system time – date
Set system time – month
Set system time – year
Zeroing
Calibration
R
2
3
6
7
Function
Code
S
9 r.
2.
3.
6.
LED Display
S.
Span
Concentration
7.
Date
Month
Date
Month
Gas
Sensor Span Reserve
Description
Set span gas concentration
Check the span reserve
The latest alarm time-date
The latest alarm time-month
The latest calibration time-date
The latest calibration timemonth
9. Year The latest calibration time-year
Table 8-3 Function Codes
# # #
65
66
Chapter 9 | Warranty
Warranty
Industrial Scientific - Oldham fixed system products are warranted to be free from defects in material and workmanship for a period of twenty-four (24) months from the date of shipment.
The above warranty does not include consumables such as 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 Industrial Scientific - Oldham literature accompanying the product.
In addition, Industrial Scientific - Oldham warrants sensors to be free from defects in material and workmanship for the indicated periods below from the date of shipment, except where otherwise stated in writing in Industrial
Scientific - Oldham literature accompanying the product.
Infrared sensors:
Catalytic, CO and H
2
S sensors:
O
2
sensors:
Other sensors: three (3) years two (2) years eighteen (18) months twelve (12) months
Limitation of Liability
Industrial Scientific - 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 Industrial Scientific - Oldham’s only obligation shall be, at
Industrial Scientific - 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 Industrial Scientific - 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 Industrial Scientific - 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 Industrial
67
Scientific - Oldham’s product literature. Repair or maintenance by nonqualified personnel will invalidate the warranty, as will the use of nonapproved consumables or spare parts. As with any other sophisticated product, it is essential and a condition of Industrial Scientific - 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 Industrial Scientific -
Oldham with respect to the use of the goods or services is given without charge and at buyer’s risk; therefore, Industrial Scientific - Oldham assumes no obligation or liability for the advice given or results obtained.
SPECIFICATIONS SUBJECT TO CHANGE
# # #
68
Appendix A | HART Interface
Introduction
IMPORTANT: This portion of the instruction manual is only applicable if your unit has been shipped HART Enabled.
The fixed-point gas monitor is designed to provide continuous monitoring of hazardous gases in the workplace. The is capable of displaying one or two gas concentrations as well as sensor or instrument specific diagnostics.
The HART supported comes with a channel-1 4-20mA output equipped with standard FSK HART interface capability. The channel-1
HART output can be used to access the process variables on digital control systems or a HART handheld device can be used to access process variables of from anywhere in the 4-20mA loop as long as the handheld device is on the modem side of the 250 ohm load. parameterization can also be accomplished through HART interface.
Figure A - 1 HART Board
channel-2 has a standard 4-20mA output. is available with an optional relay board, allowing the device to directly control external devices such as fans, pumps, alarm horns, or warning lights. Also there are three onboard relays available; two of the relays can be programmed for alarm activation, while the third relay is a fault protection relay.
The is powered with a 24 VDC (12-28 VDC) power supply and provides a 4-20mA control signal for each sensor.
For more details on specifications, supported sensor types, agency
approvals and EU, please see Chapter 1 |.
IMPORTANT:
In Chapter 1 |, under “Specifications” section the “Signal
Outputs” specification is replaced with Table A - 1.
69
Items
Signal
Outputs
Description
Digital 4-20mA FSK HART (HCF Compliant )
Analog 4-20mA (linear analog)
Table A - 1 HART Supported Signals
Hardware Overview
For details please see Chapter 2 |.
IMPORTANT:
In Chapter 2 |, the “Electronic Modules” section is replaced
with the following section.
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 the figure. The electronics module for a remote sensors unit is shown in the figure. The wiring details of main unit electronics module are explained in “System Wiring” section of this appendix and for the wiring details of remote sensors unit
electronic module please see Chapter 4 |.
Figure A - 2 Electronics Module for HART Supported (Main Unit)
70
Figure A - 3 Electronics Board for Remote Sensor Unit
Installation
For details please see Chapter 3 |.
System Wiring
For details please see Chapter 4 |.
IMPORTANT:
In Chapter 4 |, the “Power and Output Wiring (J1)” section is
replaced with the following section.
Power and Output Wiring (J1)
In most applications the power is supplied from the controller that is receiving the 4-20mA output. In these applications only three wires are required in case of single sensor unit and only four wires are required in case of dual sensor unit since common is shared.
If the 4-20mA output is going to another device other than the one that is powering it, or the transmitter has its own local power supply, another connection from GND must be extracted for the 4-20mA loop to function.
71
72
Figure A - 4 Wiring Diagram of Single Sensor HART Supported
Figure A - 5 Wiring Diagram of Dual Sensor HART Supported
73
Connect the terminals as follows.
power and signal wires to the appropriate wiring
24 V: Connect 24 VDC (12-28 VDC) supply power
CH-1:
CH-2:
GND:
Channel 1, HART 4-20 mA output signal
Channel 2, 4-20 mA output signal
DC return
Figure A - 6 Power and Signal Connector J1 on HART Supported
HART 4-20mA Wiring (CH-1)
CH-1 and GND on J1 connector are used as HART 4-20mA interface terminals. The HART 4-20mA output must be loaded with at least 250 ohms of impendence to properly establish the HART communication. Some devices receiving the 4-20mA output already have a large enough terminating resistor installed from the factory, but others may need additional resistance to be added. This is accomplished by adding a resistor in series with the output from HART board, preferably at the controller end of the 4-20mA current loop. Adding the additional resistor at the controller allows the HART handheld device to be connected anywhere in the loop, because it must have the full 250 ohm load after its connection point to function properly. If the additional resistor is added at the transmitter, in CH-
1, the HART handheld device will only be able to access variables locally, at the transmitter.
The Figure A - 7 shows a 150 ohm resistor added to the output loop since
the controller has a 100 ohm terminating resistor installed from the factory.
74
Figure A - 7 Example of HART Supported Wiring
NOTE: Use supplied green conductor for enclosure ground.
NOTE: The is a 3- or 4-wire 4-20mA device. For dual sensor configuration you must have a second 4-20mA signal wire pulled to the unit.
NOTE: When not using isolated 4-20mA or HART 4-20mA outputs, use the supplied resistors to connect CH-1 and CH-2 to GND. If these resistors are not connected and the 4-20mA outputs are not used, a “P” will appear on the display, indicating an open loop condition.
IMPORTANT:
In Chapter 4 |, the “Digital ModBus RTU Interface Wiring”
section is not applicable for HART supported not available on HART supported unit.
as ModBus interface is
75
Operation
For details please see Chapter 5 |.
IMPORTANT:
All the details given in Chapter 5 | regarding the operation of
the are valid for a HART supported unit. This section only provides the details on operation of HART interface.
Initial Start-up
The HART 4-20mA interface is disabled during the initial start-up after the is powered up.
During the initial start-up, the connected sensors are detected and initialized. The initial start-up mode lasts for approximately 45 seconds.
Figure A - 8 Main Unit Start-up Display
Warm-up Mode
After the initial start-up, the enters the warm-up mode which lasts for three minutes. During the warm-up mode, all gas reading related alarms are disabled, the current on the HART 4-20mA channel remains fixed at 3mA (16mA for oxygen sensor) and the HART interface is communication. enabled for
Normal Mode
After the warm-up mode, the enters the normal gas reading mode,
During the normal mode, all gas reading related alarms are enabled and the current on the HART 4-20mA channel linearly follows the sensor 1 gas reading between zero reading to measurement range with 4mA and
20mA being the corresponding current values. In case of an under range or an over range reading the channel current value is fixed at
Figure A - 9 Warm-up Display
1mA. HART interface is enabled throughout the normal mode.
Figure A - 10 Normal Mode Display
76
Calibration and Zeroing Modes
The enters the calibration or zeroing mode when the user selects the corresponding operation on sensor 1 through intrusive/nonintrusive programming screen or through HART 4-20mA interface.
During both of zeroing and calibration modes the HART channel current remains fixed at 3mA (16mA for oxygen sensor). A successful zeroing or calibration operation is followed by a warm-up mode and an unsuccessful operation is followed by a corresponding fault mode.
Figure A - 11 Calibration Display
HART interface is enabled throughout the zeroing and calibration modes.
Fault Mode
The enters the fault mode whenever it is not able to provide the gas reading to the user interface.
There are different types of sensor faults which have been listed in the
Table A - 2. The fault detection is enabled throughout the
operation after the device is powered on, and the fault codes are indicated on the display after the initial start-up mode.
During the fault mode on sensor 1 the HART 4-20mA channel current remains fixed at 1mA and HART interface is enabled throughout fault mode.
Figure A - 12 Fault Mode Display
77
Fault
Code
1FFF
2FFF
ConF
CFFF
0FFF
Fault Type
Failed Sensor
4-20mA
Output
1 mA
Missing Sensor 1 mA
Sensor
Configuration
Calibration
Failed
Zeroing Failed
1mA
1 mA
1 mA
Description
Smart sensor communication error
Sensor board communication error
Sensor internal parameters error –
Recover after factory configuration of sensor
Calibration error – Recover after calibrating or replacing the sensor
Zeroing error – Recover after zeroing or calibrating
Table A - 2 Fault Code Description
Open Loop Condition
When any of the 4-20mA channels is not being used it should be terminated by inserting the specifically provided (250 ohms for
HART CH-1 and 100 ohms for isolated CH-2) resistor between the respective channel output terminal and ground terminal.In case an unused channel is not terminated with the provided resistor, a ‘P’ will appear at the status bit indicating the open loop condition. Also in case the channel output is being used but one of the connecting wires is damaged or disconnected, same condition will be displayed to let the user know about the disconnection in the wiring. HART communication cannot be established with a physical disconnection under this condition.
Figure A - 13 Sensor 1 Open Loop
Condition Display
78
HART Interface
Electronic Device Descriptor (EDD)
An Electronic Device Descriptor (EDD) is available for which is easiest and the quickest way to access all the process variables of
.The EDD can be either loaded on a PC host simulator or on a
handheld unit. Figure A - 14 shows the
EDD loaded using a PC host
simulator. Figure A - 16 shows the connection diagram of
to a PC.
Figure A - 14 EDD Menus List View
79
Figure A - 15 EDD GUI View
80
Figure A - 16 PC to HART Interface Wiring Diagram
User Commands
supports all the standard universal HART commands. This section only provides the details of the device-specific commands.
Read Commands
All read commands are dispatched without any request data and the response data is then translated to get the requested process variables. In case of a single sensor the parameters of disconnected sensor are uninitialized and a warning is indicated in the response code of the command. The translation/parsing details along with response length of the
commands are given in the Table A - 3.
Command 128 – Read Firmware Revision – Response Length: 8 Bytes
Byte Number
0-1
Parsing
Unsigned-16
Parameter iTrans HART Board Firmware Version
2-3
4-5
Unsigned-16
Unsigned-16 iTrans Main Unit Firmware Version
Sensor 1 Firmware Version
6-7 Unsigned-16 Sensor 2 Firmware Version
Command 129 – Read Live Channels Gas Data – Response Length: 24 Bytes
Byte Number
0-3
4-7
8-9
10-11
12-15
16-19
20-21
Parsing
Float IEEE 754
Float IEEE 754
Unsigned-16
Unsigned-16
Float IEEE 754
Float IEEE 754
Unsigned-16
Parameter
Gas Reading Channel 1
Temperature Reading Channel 1
Channel 1 Mode
Channel 1 Status
Gas Reading Channel 2
Temperature Reading Channel 2
Channel 2 Mode
0
1
2
22-23 Unsigned-16 Channel 2 Status
Command 130 – Read Real Time Clock – Response Length: 18 Bytes
Byte Number Parsing Parameter
Unsigned-8
Unsigned-8
Unsigned-8
RTC Minute Channel 1
RTC Hour Channel 1
RTC Day Channel 1
81
9
10
11
12
3
4
5-8
Unsigned-8
Unsigned-8
Unsigned-32
Unsigned-8
Unsigned-8
Unsigned-8
Unsigned-8
RTC Month Channel 1
RTC Year Channel 1
Total Operation Time (In Minutes) Channel 1
RTC Minute Channel 2
RTC Hour Channel 2
RTC Day Channel 2
RTC Month Channel 2
13
14-17
Unsigned-8
Unsigned-32
RTC Year Channel 2
Total Operation Time (In Minutes) Channel 2
Command 131 – Read User Configuration – Response Length: 36 Bytes
Byte Number
0-3
4-7
8-11
Parsing
Float IEEE 754
Float IEEE 754
Float IEEE 754
Parameter
Low Alarm Threshold Channel 1
High Alarm Threshold Channel 1
Analog Output Range Channel 1
12-15
16-17
18-21
22-25
26-29
30-33
34-35
Float IEEE 754
Unsigned-16
Float IEEE 754
Float IEEE 754
Float IEEE 754
Float IEEE 754
Unsigned-16
Cal Gas Value Channel 1
Calibration Interval In Days Channel 1
Low Alarm Threshold Channel 2
High Alarm Threshold Channel 2
Analog Output Range Channel 2
Cal Gas Value Channel 2
Calibration Interval In Days Channel 2
Command 132 – Read Live Channels Information – Response Length: 26 Bytes
Byte Number Parsing Parameter
0-3
4-5
Float IEEE 754
Unsigned-16
User Peak Channel 1
Previous OR Channel 1
6
7
8
9-10
11-12
Unsigned-8
Unsigned-8
Unsigned-8
Unsigned-16
Unsigned-16
Last Alarm Day Channel 1
Last Alarm Month Channel 1
Last Alarm Year Channel 1
Max Temperature Channel 1
Min Temperature Channel 1
82
13-16
17-18
19
20
21
22-23
24-25
Float IEEE 754
Unsigned-16
Unsigned-8
Unsigned-8
Unsigned-8
Unsigned-16
Unsigned-16
User Peak Channel 2
Previous OR Channel 2
Last Alarm Day Channel 2
Last Alarm Month Channel 2
Last Alarm Year Channel 2
Max Temperature Channel 2
Min Temperature Channel 2
1
2
3-4
5-6
Command 133 – Read Live Channels Identifier – Response Length: 66 Bytes
Byte Number
0
Parsing
Unsigned-8
Parameter
Sensor Type Code Channel 1
Unsigned-8
Unsigned-8
Latin-1 ASCII
Latin-1 ASCII
Gas Type Code Channel 1
Decimal Place Channel 1
Sensor ID Byte Channel 1
Sensor ID Number Channel 1
7-16
17-32
33
34
35
36-37
38-39
40-49
Latin-1 ASCII
Latin-1 ASCII
Unsigned-8
Unsigned-8
Unsigned-8
Latin-1 ASCII
Latin-1 ASCII
Latin-1 ASCII
Sensor Part Number Channel 1
Sensor Serial Number Channel 1
Sensor Type Code Channel 2
Gas Type Code Channel 2
Decimal Place Channel 2
Sensor ID Byte Channel 2
Sensor ID Number Channel 2
Sensor Part Number Channel 2
50-65 Latin-1 ASCII Sensor Serial Number Channel 2
Command 134 – Read Instrument Identifier – Response Length: 50 Bytes
Byte Number Parsing Parameter
0-1
2-17
18-33
34-37
38-43
Latin-1 ASCII
Latin-1 ASCII
Latin-1 ASCII
Latin-1 ASCII
Latin-1 ASCII
Instrument Config Map Version
Instrument Part Number
Instrument Serial Number
Technician Initials
Instrument Job Number
83
6
7-8
9-12
13
14
15
16-17
44-49 Latin-1 ASCII Manufacture Date
Command 135 – Read Calibration Data – Response Length: 18 Bytes
4
5
Byte Number
0-3
Parsing
Float IEEE 754
Unsigned-8
Unsigned-8
Parameter
Span Reserve Value Channel 1
Last Cal Day Channel 1
Last Cal Month Channel 1
Unsigned-8
Unsigned-16
Float IEEE 754
Unsigned-8
Unsigned-8
Unsigned-8
Unsigned-16
Last Cal Year Channel 1
Next Cal Due In Days Channel 1
Span Reserve Value Channel 2
Last Cal Day Channel 2
Last Cal Month Channel 2
Last Cal Year Channel 2
Next Cal Due In Days Channel 2
Table A - 3 Read Commands
Write Commands
All write commands are dispatched with specific number of data bytes which are written to specified parameters after parsing process. In case of a single sensor the parameters of disconnected sensor are also included in the request data although those can be set at 0. The response of a write command is the same as the request. The details are provided in the
Command 140 – Write Real Time Clock – Response/Request Length: 18 Bytes
Byte Number Parsing Parameter
9
10
11
12
0
1
2
3
4
5-8
Unsigned-8
Unsigned-8
Unsigned-8
Unsigned-8
Unsigned-8
Unsigned-32
Unsigned-8
Unsigned-8
Unsigned-8
Unsigned-8
RTC Minute Channel 1
RTC Hour Channel 1
RTC Day Channel 1
RTC Month Channel 1
RTC Year Channel 1
Total Operation Time (In Minutes) Channel 1
RTC Minute Channel 2
RTC Hour Channel 2
RTC Day Channel 2
RTC Month Channel 2
84
13
14-17
Unsigned-8
Unsigned-32
RTC Year Channel 2
Total Operation Time (In Minutes) Channel 2
Command 141 – Write User Configuration – Response/Request Length: 36 Bytes
Byte Number
0-3
4-7
8-11
12-15
16-17
18-21
22-25
26-29
30-33
34-35
Parsing
Float IEEE 754
Float IEEE 754
Float IEEE 754
Float IEEE 754
Unsigned-16
Float IEEE 754
Float IEEE 754
Float IEEE 754
Float IEEE 754
Unsigned-16
Parameter
Low Alarm Threshold Channel 1
High Alarm Threshold Channel 1
Analog Output Range Channel 1
Cal Gas Value Channel 1
Calibration Interval In Days Channel 1
Low Alarm Threshold Channel 2
High Alarm Threshold Channel 2
Analog Output Range Channel 2
Cal Gas Value Channel 2
Calibration Interval In Days Channel 2
Table A - 4 Write Commands
Operation Commands
Operation commands are similar to write commands where specific values are written on specific sensor to get the desired operation done. The details
are enlisted in the Table A - 5.
Command 150 – Start/Abort Selected Live Channel Calibration – Response/Request
Length: 2
Byte Number Parsing Parameter
0 Unsigned-8
Selected Sensor (“1 = Sensor 1” and “2 = Sensor
2”)
1 Unsigned-8 Calibration Condition (“1 = Abort” and “2 = Start”)
Command 151 – Start/Abort Selected Live Channel Zeroing – Response/Request
Length: 2
Byte Number Parsing Parameter
0 Unsigned-8
Selected Sensor (“1 = Sensor 1” and “2 = Sensor
2”)
1 Unsigned-8 Zeroing Condition (“1 = Abort” and “6 = Start”)
Table A - 5 Operation Commands
# # #
85
86
Appendix B | Acronyms and
Abbreviations
This appendix contains acronyms and abbreviations that are used within this document.
C2H4
C2H6O
C3H6
C3H8
C4H10
C5H12
C6H14
C2H4
Abbr
A
ABS
ASCII bit bps
C
CALI
CAT
Ch
CH4 chem
Cl2
ClO2
CO
CO2
Definition
Ampere acrylonitrile butadiene styrene
American Standard Code for Information Interchange binary digit bits per second centigrade ethylene ethanol propylene propane butane pentane hexane ethylene calibration catalytic channel methane chemical chlorine chlorine dioxide carbon monoxide carbon dioxide
87
NDIR
NEMA
NH3
NO
NO2
NOR
NRTL
O2
OXY
ISC
LED
LEL
LSB mA mm
MSB
NC
FAQ
FAUL
FIFO
GND
H2
H2S
HCl
HCN
Abbr
CSA
DC
DCS
DIP
DISP
F
88
Definition
Canadian Standards Association direct current distributed control system dual in-line package display
Fahrenheit frequently asked questions fault first-in-first-out ground hydrogen hydrogen sulfide hydrogen chloride hydrogen cyanide
Industrial Scientific Corporation light emitting diode lower explosive limit (combustible gases) least significant bit milliampere millimeter most significant bit normally closed non-dispersive infrared
National Electrical Manufacturers Association ammonia normally open, Nitric Oxide nitrogen dioxide normal mode nationally recognized testing laboratory oxygen oxygen
Abbr
PH3
PLC ppm
REST
RH
RTC
RTU
SO2
SPST
TOX
V
Definition phosphine programmable logic controller parts per million restart relative humidity real time clock remote terminal unit sulfur dioxide single-pole, single-throw toxic
Volts
Table B - 1 Acronyms and Abbreviations
# # #
89
90
Appendix C | Decimal, Binary, And
Hex Equivalents
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 C - 1. Decimal and binary
equivalents are shown in Table C - 2.
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
91
10
11
12
13
8
9
6
7
14
15
16
17
18
4
5
2
3
Dec
0
1
0x00 = 000 0x20 = 032 0x40 = 064 0x60 = 096 0x80 = 128 0xA0 = 160 0xC0 = 192 0xE0 = 224
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
Table C - 1 Hexadecimal and Decimal Equivalents
Binary Dec
00000000 64
00000001 65
00000010 66
00000011 67
00000100 68
00000101 69
00000110 70
00000111 71
00001000 72
00001001 73
00001010 74
00001011 75
00001100 76
00001101 77
00001110 78
00001111 79
00010000 80
00010001 81
00010010 82
Binary Dec
01000000 128
01000001 129
01000010 130
01000011 131
01000100 132
01000101 133
01000110 134
01000111 135
01001000 136
01001001 137
01001010 138
01001011 139
01001100 140
01001101 141
01001110 142
01001111 143
01010000 144
01010001 145
01010010 146
Binary Dec
10000000 192
10000001 193
10000010 194
10000011 195
10000100 196
10000101 197
10000110 198
10000111 199
10001000 200
10001001 201
10001010 202
10001011 203
10001100 204
10001101 205
10001110 206
10001111 207
10010000 208
10010001 209
10010010 210
Binary
11000000
11000001
11000010
11000011
11000100
11000101
11000110
11000111
11001000
11001001
11001010
11001011
11001100
11001101
11001110
11001111
11010000
11010001
11010010
92
Binary Dec
00010011 83
00010100 84
00010101 85
00010110 86
00010111 87
00011000 88
00011001 89
00011010 90
00011011 91
00011100 92
00011101 93
00011110 94
00011111 95
00100000 96
00100001 97
00100010 98
00100011 99
00100100 100
00100101 101
00100110 102
00100111 103
00101000 104
00101001 105
00101010 106
00101011 107
00101100 108
00101101 109
00101110 110
00101111 111
00110000 112
00110001 113
45
46
47
48
49
41
42
43
44
37
38
39
40
33
34
35
36
29
30
31
32
25
26
27
28
21
22
23
24
Dec
19
20
Binary Dec
01010011 147
01010100 148
01010101 149
01010110 150
01010111 151
01011000 152
01011001 153
01011010 154
01011011 155
01011100 156
01011101 157
01011110 158
01011111 159
01100000 160
01100001 161
01100010 162
01100011 163
01100100 164
01100101 165
01100110 166
01100111 167
01101000 168
01101001 169
01101010 170
01101011 171
01101100 172
01101101 173
01101110 174
01101111 175
01110000 176
01110001 177
Binary Dec
10010011 211
10010100 212
10010101 213
10010110 214
10010111 215
10011000 216
10011001 217
10011010 218
10011011 219
10011100 220
10011101 221
10011110 222
10011111 223
10100000 224
10100001 225
10100010 226
10100011 227
10100100 228
10100101 229
10100110 230
10100111 231
10101000 232
10101001 233
10101010 234
10101011 235
10101100 236
10101101 237
10101110 238
10101111 239
10110000 240
10110001 241
11100001
11100010
11100011
11100100
11100101
11100110
11100111
11101000
11101001
11101010
11101011
11101100
11101101
11101110
11101111
11110000
11110001
Binary
11010011
11010100
11010101
11010110
11010111
11011000
11011001
11011010
11011011
11011100
11011101
11011110
11011111
11100000
93
60
61
62
63
56
57
58
59
52
53
54
55
Dec
50
51
Binary Dec
00110010 114
00110011 115
00110100 116
00110101 117
00110110 118
00110111 119
00111000 120
00111001 121
00111010 122
00111011 123
00111100 124
00111101 125
00111110 126
00111111 127
Binary Dec
01110010 178
01110011 179
01110100 180
01110101 181
01110110 182
01110111 183
01111000 184
01111001 185
01111010 186
01111011 187
01111100 188
01111101 189
01111110 190
01111111 191
Binary Dec
10110010 242
10110011 243
10110100 244
10110101 245
10110110 246
10110111 247
10111000 248
10111001 249
10111010 250
10111011 251
10111100 252
10111101 253
10111110 254
10111111 255
Table C - 2 Decimal and Binary Equivalents
# # #
Binary
11110010
11110011
11110100
11110101
11110110
11110111
11111000
11111001
11111010
11111011
11111100
11111101
11111110
11111111
94
Appendix D | Ordering Matrix
This appendix provides an ordering matrix for the gas monitor.
Base part number iTrans2-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: iTrans2-1C21241 =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
B = Gas sensor 1
E = Sensor 2 Configuration
F = Gas sensor 2
C= 4-20 mA output scale for sensor 1
D = Optional on-board relays
G = 4-20 mA output scale for sensor 2
A - Sensor 1
1 = Explosion Proof / On-board
2 = Explosion Proof / Remote
E – Sensor 2
0 = No sensor
1 = Explosion Proof / On-board
2 = Explosion Proof / Remote
3 = Non-hazardous Remote/Duct Mount
4 = Explosion Proof / On-board with
Splash Guard
5 = Explosion Proof / Remote with Splash
Guard
6 = Stainless Steel / On-board
7 = Stainless Steel / Remote
B - Gas sensor 1
1 = Carbon Monoxide (CO)
2 = Nitric Oxide (NO)
3 = Ammonia (NH3)
3 = Non-hazardous Remote/Duct Mount
4 = Explosion Proof / On-board with
Splash Guard
5 = Explosion Proof / Remote with
Splash Guard
7 = Stainless Steel / Remote
F - Gas sensor 2
1 = Carbon Monoxide (CO)
2 = Nitric Oxide (NO)
3 = Ammonia (NH3)
95
4 = Hydrogen Sulfide (H2S)
5 = Sulfur Dioxide (SO2)
6 = Nitrogen Dioxide (NO2)
7 = Chlorine (Cl2)
8 = Chlorine Dioxide (ClO2)
9 = Hydrogen Cyanide (HCN)
A = Oxygen (O2)
B = LEL Catalytic Plug-In (factory
Methane calibration)
C = LEL Catalytic Plug-In (factory
Pentane calibration)
D = Carbon Monoxide - Hydrogen Null
(CO - H2)
F = Hydrogen Chloride (HCl)
K = Phosphine (PH3)
L = Hydrogen (H2)
M = Methane IR (CH4) by Vol
N = Methane IR (CH4) by LEL
O = Propane IR (C3H8)
P = Propylene IR (C3H6)
Q = Pentane IR (C5H12)
R = Butane IR (C4H10)
S = Ethylene IR (C2H4)
T = Ethanol IR (C2H6O)
U = Hexane IR (C6H14)
V = Carbon Dioxide (0-5% CO2)
W = Carbon Dioxide (0-100% CO2)
X = Carbon Dioxide (0-0.5% CO2)
C - 4-20 mA Output Scale for Sensor 1
0 = 0 - 999
1 = 0 - 500
2 = 0 - 100
4 = Hydrogen Sulfide (H2S)
5 = Sulfur Dioxide (SO2)
6 = Nitrogen Dioxide (NO2)
7 = Chlorine (Cl2)
8 = Chlorine Dioxide (ClO2)
9 = Hydrogen Cyanide (HCN)
A = Oxygen (O2)
B = LEL Catalytic Plug-In (factory
Methane calibration)
C = LEL Catalytic Plug-In (factory
Pentane calibration)
D = Carbon Monoxide - Hydrogen Null
(CO - H2)
F = Hydrogen Chloride (HCl)
K = Phosphine (PH3)
L = Hydrogen (H2)
M = Methane IR (CH4) by Vol
N = Methane IR (CH4) by LEL
O = Propane IR (C3H8)
P = Propylene IR (C3H6)
Q = Pentane IR (C5H12)
R = Butane IR (C4H10)
S = Ethylene IR (C2H4)
T = Ethanol IR (C2H6O)
U = Hexane IR (C6H14)
V = Carbon Dioxide (0-5% CO2)
W = Carbon Dioxide (0-100% CO2)
X = Carbon Dioxide (0-0.5% CO2)
G - 4-20 mA Output Scale for Sensor 2
0 = 0 - 999
1 = 0 - 500
2 = 0 - 100
96
3 = 0 - 50
4 = 0 - 30
5 = 0 - 10
6 = 0 - 2
7 = 0 - 1
8 = 0 - 20
9 = 0 - 200
A = 0 – 5.00
B = 0 – 0.50
D – Optional On-Board Relays
0 = No Relay Module (Modbus)
1 = With Optional On-Board Relays (Modbus)
2 = No Relay Module (HART)
3 = 0 - 50
4 = 0 - 30
5 = 0 - 10
6 = 0 - 2
7 = 0 - 1
8 = 0 - 20
9 = 0 - 200
A = 0 – 5.00
B = 0 – 0.50
3 = With Optional On-Board Relays (HART)
# # #
97
98
Appendix E | Factory Default
Settings
Sensor Name
CO
H2S
SO2
NO2
Cl2
ClO2
HCN
PH3
CO/H2 NULL
NO
NH3
HCl
H2
O2
Infrared, LEL
Catalytic Bead,
LEL Methane
Catalytic Bead,
LEL Pentane
CH4 by Vol.
CO2
CO2
CO2
This appendix lists factory default
sensor(s) used. Refer to Table E - 1.
settings based on the individual
Range
0-999 ppm
0-500 ppm
0-99.9 ppm
0-99.9 ppm
0-99.9 ppm
0-1.00 ppm
0-30.0 ppm
0-1.00 ppm
0-999 ppm
0-999 ppm
0-200 ppm
0-30.0 ppm
0-999 ppm
0-30% Vol.
0-100% LEL
0-100% LEL
Resolution Cal Gas
1 ppm
1 ppm
0.1 ppm
0.1 ppm
0.1 ppm
0.01 ppm
0.1 ppm
100 ppm
25 ppm
5 ppm
5 ppm
10 ppm
0.90 ppm
10 ppm
0.01 ppm
1 ppm
1 ppm
1 ppm
1.0 ppm
100 ppm
25 ppm
25 ppm
0.1 ppm
1 ppm
10 ppm
100 ppm
0.1% Vol. 20.9%
1% LEL 50% LEL
1% LEL 50% LEL
Default Low
Alarm
35 ppm
10 ppm
2.0 ppm
1.0 ppm
0.5 ppm
0.30 ppm
5.0 ppm
0.30 ppm
35 ppm
25 ppm
25 ppm
5.0 ppm
50 ppm
19.5%
10% LEL
10% LEL
Default
High Alarm
70 ppm
20 ppm
4.0 ppm
2.0 ppm
1.0 ppm
0.50 ppm
10.0 ppm
0.60 ppm
70 ppm
50 ppm
50 ppm
10.0 ppm
100 ppm
23.5%
20% LEL
20% LEL
0-100% LEL 1% LEL 25% LEL 10% LEL
0-100% Vol. 1% Vol. 50% Vol. 10% Vol
0-0.05% Vol. 0.01% Vol. 0.25%Vol. 0.10% Vol
0-5.00% Vol. 0.01% Vol. 2.50% Vol. 1.00% Vol
0-100% Vol. 1% Vol. 50% Vol. 10% Vol
Table E - 1 Factory Default Settings
20% LEL
20% Vol
0.20% Vol
2.00% Vol
20% Vol
# # #
99
100
Appendix F | Infrared Sensors
The methane IR sensor is only intended to monitor methane gas. As seen in
Figure F - 1, the cross-sensitivity of the methane IR sensor does not permit
accurate measure of other combustible gases. It should be noted however, that the methane-IR sensor WILL respond to other combustible gases and is not methane specific.
Figure F - 1 Cross-sensitivity chart for methane IR Sensor
101
The propane IR sensor is factory configured to accurately monitor propane
gas. As seen in Figure F - 2 the cross-sensitivity of the propane IR sensor
does permit accurate measure of other combustible gases via a crossreference factor. It should be noted however, that the propane-IR sensor
WILL respond to other combustible gases and is not propane specific.
Figure F - 2 Cross-sensitivity chart for Propane IR Sensor
The output of the IR sensor can be disrupted by sudden changes in temperature. If there is an excessive change in the ambient temperature, gas sample temperature or flow rate, then the output signal will be monmentarily 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 orignial pressure.
# # #
102
Appendix G | LEL Correlation
Factors
The following chart outlines LEL correlation factors for combustible catalytic gas sensors installed in iTrans2.
Methane Pentane Hydrogen
Acetone
Acetylene
Ammonia
Benzene n-Butane
Ethane
Ethanol
Ethylene n-Hexane
Hydrogen
Isopropanol
JP-4
JP-5
JP-8
Methane
Methanol n-Pentane
Propane
Styrene
Toluene
Xylene
1.80
1.40
1.00
2.10
1.80
1.40
1.60
1.40
2.85
1.80
3.00
3.10
3.20
1.00
1.35
2.00
1.60
2.40
2.50
2.40
0.90
0.70
0.50
1.05
0.90
0.70
0.80
0.70
1.40
0.90
1.50
1.55
1.60
0.65
1.00
0.80
1.20
1.25
1.20
Example: The instrument has been calibrated on methane and is now reading 10% LEL in a pentane atmosphere. To find actual %LEL pentane, please multiply by the number found at the intersection of the methane column (calibration gas) and the pentane row (gas being sampled)…in this case, 2.00. Therefore, the actual %LEL pentane is 20% (10x2.00).
1.00
Calibration gases available from Industrial Scientific - Oldham.
103
104
105
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