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Model CXT-DM
Table of Contents
1.
Introduction ..................................................................................................................................................1
1.1
Description .......................................................................................................................................... 1
1.2
Modular Design .................................................................................................................................. 2
1.2.1
CXT-DM Intelligent Transmitter Module ...................................................................................... 3
1.2.2
Field Replaceable Sensor ................................................................................................................ 3
1.3
CXT Wireless Network ....................................................................................................................... 4
1.4
Battery Pack Options .......................................................................................................................... 4
1.4.1
Detcon’s Smart Battery Pack .......................................................................................................... 4
1.4.2
Tri-C Lithium Battery Pack ............................................................................................................ 5
2.
Installation ....................................................................................................................................................7
2.1
Hazardous Locations Installation Guidelines for Safe Use ................................................................. 7
2.2
Sensor Placement ................................................................................................................................ 8
2.3
Sensor Contaminants and Interference ............................................................................................... 9
2.4
Sensor Mounting ................................................................................................................................. 9
2.5
Electrical Installation ........................................................................................................................ 11
2.6
Initial Start Up................................................................................................................................... 13
2.6.1
Toxic Gas Sensors ........................................................................................................................ 13
2.6.2
O
2
Deficiency Sensors .................................................................................................................. 14
3.
Operation ....................................................................................................................................................16
3.1
Operator Interface ............................................................................................................................. 17
3.2
Normal Operation ............................................................................................................................. 18
3.3
Calibration Mode .............................................................................................................................. 18
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 Detection Range ..................................................................................................................... 23
3.4.3
Set Autospan Level ....................................................................................................................... 24
3.4.4
Bump Test .................................................................................................................................... 24
3.4.5
Restore Defaults ........................................................................................................................... 24
3.4.6
Set RF Channel ............................................................................................................................. 25
3.4.7
Set Modbus ID .............................................................................................................................. 25
3.5
Fault Diagnostic/Failsafe Feature ..................................................................................................... 26
4.
Modbus™ 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 & Description ........................................................................................... 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 pact ......................................................................................... 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 ......................................................................................................... 34
5.3
Replacement of ITM – Aluminum J-Box ......................................................................................... 35
5.4
Replacement of ITM – Stainless Steel Mini Condulet...................................................................... 36
6.
Troubleshooting Guide ...............................................................................................................................37
7.
Customer Support and Service Policy ........................................................................................................39
8.
CXT-DM Sensor Warranty ........................................................................................................................40
9.
Appendix ....................................................................................................................................................41
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