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Model CXT-IR
Table of Contents
1.
Introduction ............................................................................................................................................... 1
1.1
Description .......................................................................................................................................... 1
1.2
Modular Design .................................................................................................................................. 3
1.2.1
CXT-IR Intelligent Transmitter Module ........................................................................................ 3
1.2.2
Field Replaceable Sensor ................................................................................................................ 4
1.3
CXT Wireless Network ....................................................................................................................... 4
1.4
Battery Pack Options .......................................................................................................................... 5
1.4.1
Detconꞌs Smart Battery Pack .......................................................................................................... 5
1.4.2
Tri-C Lithium Battery Pack ............................................................................................................ 6
2.
Installation .................................................................................................................................................. 8
2.1
Hazardous Locations Installation Guidelines for Safe Use ................................................................. 8
2.2
Sensor Placement ................................................................................................................................ 9
2.3
Sensor Contaminants and Interference ............................................................................................. 10
2.4
Sensor Mounting ............................................................................................................................... 10
2.5
Electrical Installation ........................................................................................................................ 12
2.5.1
Applying Power to the Unit .......................................................................................................... 13
2.6
Initial Start Up................................................................................................................................... 14
2.6.1
Combustible Gas Sensors ............................................................................................................. 14
3.
Operation .................................................................................................................................................. 16
3.1
Operator Interface ............................................................................................................................. 17
3.1.1
Software Flowchart....................................................................................................................... 18
3.2
Normal Operation ............................................................................................................................. 19
3.3
Calibration Mode .............................................................................................................................. 19
3.3.1
AutoZero ....................................................................................................................................... 19
3.3.2
AutoSpan ...................................................................................................................................... 20
3.4
Program Mode .................................................................................................................................. 22
3.4.1
View Sensor Status ....................................................................................................................... 22
3.4.2
Set Gas Type ................................................................................................................................. 23
3.4.3
Set AutoSpan Level ...................................................................................................................... 23
3.4.4
Set Gas Factor ............................................................................................................................... 24
3.4.5
Bump Test .................................................................................................................................... 25
3.4.6
Restore Defaults ........................................................................................................................... 25
3.4.7
Set RF Channel ............................................................................................................................. 25
3.4.8
Set Modbus™ ID .......................................................................................................................... 26
3.5
Fault Diagnostic/Failsafe Feature ..................................................................................................... 26
4.
Modbus™ TM Communications ............................................................................................................ 27
4.1
General Modbus™ Description ........................................................................................................ 27
4.1.1
Modbus™ Exceptions .................................................................................................................. 27
4.1.2
Modbus™ Broadcast Requests ..................................................................................................... 28
4.2
Modbus™ Register Map and Directions........................................................................................... 28
4.2.1
CXT Sensor Registers .................................................................................................................. 30
4.2.2
CXT Transceiver Registers .......................................................................................................... 31
5.
Service and Maintenance ........................................................................................................................ 33
5.1
Replacement of the Batteries/Battery Pack ....................................................................................... 33
5.1.1
Units with 12V Smart Battery Pack.............................................................................................. 33
5.1.2
Units with Tri-‘C’ sized Lithium Battery Holder ......................................................................... 33
5.2
Replacement of Plug-in Sensor ......................................................................................................... 35
5.3
Replacement of ITM – Aluminum Junction Box .............................................................................. 35
5.4
Replacement of ITM – Stainless Steel Mini Condulet...................................................................... 36
6.
Troubleshooting Guide ............................................................................................................................ 37
7.
Customer Support and Service Policy ................................................................................................... 39
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