Model CXT-IR
CXT-IR Instruction Manual
Rev. 2.1
Page 40 of 48
5.3
Replacement of ITM – Aluminum Junction Box
1.
Remove the power source to the sensor assembly.
2.
Remove the battery pack from the J-box.
3.
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.
4.
Use a wrench and the wrench flats provided at the top section of the ITM and unthread the ITM for
removal.
5.
Use a
1
/
8
" Allen wrench to release the locking cap head screw that locks the ITM and splashguard adapter
assembly together (One turn only - Do not remove setscrew completely).
6.
Unthread and remove the splashguard adapter assembly and splashguard from the ITM. These will be
re-used with the new ITM.
7.
Gently remove the plug-in combustible gas sensor from the old ITM and install it in the new ITM. Orient
the plug-in sensor pins so that it matches the female connector pins on the new ITM then press the sensor
in firmly to make proper connection.
8.
Thread the splashguard adapter assembly onto the new ITM until snug, tighten the locking cap head
screw and reinstall splashguard.
9.
Feed the sensor assembly wires and RF cable through the
3
/
4
" female NPT port and thread the assembly
into the J-box until tight and the ITM faces toward the front access point. Use the locking nut to secure
the ITM in this position.
10.
Re-connect the sensor assembly wires to the terminal board inside the Junction Box.
11.
Re-connect the RF cable to the antenna cable.
12.
Install the battery pack.
13.
Check and/or perform Zero Calibration and Span Calibration in accordance with Section 3.3.
5.4
Replacement of ITM – Stainless Steel Mini Condulet
1.
Remove the cover of the battery holder, and remove the batteries. Remove the battery holder from the
j-box by removing the two 6-32 screws at the bottom of the housing.
NOTE:
It is necessary to remove power to the Junction box while changing the ITM in order
to maintain area classification.
1.
Disconnect the sensor wire connections from the shorting blocks, taking note of the wire connections.
Disconnect the RF cable connector. (The wire splice shorting blocks can be difficult to remove wires
from. By using a pair of needle nose pliers and twisting the wires while pulling them out of the shorting
blocks can make the task easier.)
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 match 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.
