Model CXT-DM
CXT-DM Instruction Manual
Rev. 2.0
Page 38 of 54
NOTE
: Only replace the plug-in sensor with an authorized CXT-DM family of gas sensors.
ITM
(Bottom View)
Display
Window
Plug in Sensor
(Bottom view)
Locking
Setscrew
Locking
Setscrew
Figure 21 Sensor Cell and ITM Mating
1.
Use a 1/16” Allen wrench to release the locking setscrew that locks the ITM and Splashguard Adapter
Assembly together (One turn will suffice - Do not remove setscrew completely).
2.
Remove splashguard. Unthread and remove the Splashguard Adapter Assembly from the ITM.
3.
Gently pull the plug-in sensor out of the ITM. Verify the gas type and range of the new sensor cell is
correct. Orient the new plug-in sensor so that it matches with the female connector pins. When
properly aligned, press the sensor in firmly to make the proper connection.
4.
Thread the Splashguard Adapter Assembly onto the ITM to a snug fit and tighten the locking setscrew
using the 1/16” Allen wrench. Reinstall the splashguard.
5.
Check and perform zero calibration and span calibration as per Section 3.3 Calibration.
5.3
Replacement of ITM – Aluminum J-Box
1.
Remove the power source to the sensor assembly, and remove the battery pack from the J-box.
Disconnect all sensor wire connections at the Junction Box Terminal Board, taking note of the wire
connections, and disconnect the RF cable connector.
NOTE:
It is necessary to remove power to the Junction box while changing the ITM in order
to maintain area classification.
2.
Use a wrench and the wrench flats provided at the top section of the ITM and unthread the ITM until it
can be removed.
3.
Use a 1/8” Allen wrench to release the locking cap head screw that locks the ITM and Splashguard
Adapter Assembly together (One turn will suffice - Do not remove setscrew completely).
4.
Unthread and remove the Splashguard Adapter Assembly and Splash Guard from the ITM. These will
be re-used with the new ITM.
5.
Gently remove the plug-in toxic gas sensor from the old ITM and install it in the new ITM. Orient the
plug-in sensor pins so that they matches the female connector pins on the new ITM and press the
sensor in firmly to make proper connection.
6.
Thread the Splashguard Adapter Assembly onto the new ITM until snug, tighten the locking cap head
screw and reinstall Splash Guard.