Detcon CXT-DM User Manual download pdf (Page 3)

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

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

Model CXT-DM iii

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