Detcon CXT-IR - Manual (Page 39)

Model CXT-IR
5.2 Replacement of Plug-in Sensor
NOTE
It is not necessary to remove power while changing the plug-in combustible gas sensor in
order to maintain area classification, since it is intrinsically safe.
NOTE Only replace the plug-in sensor with an authorized CXT-IR family of gas sensors.
ITM
(Bottom View)
Display
Window
Plug in Sensor
(Bottom view)
Locking
Setscrew
Locking
Setscrew
detcon inc .
MODEL
CXT-IR
Figure 19 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 only - Do not remove setscrew completely).
2. Remove the splashguard.
3. Unthread and remove the splashguard adapter assembly from the ITM.
4. Gently pull the plug-in sensor out of the ITM. Verify the gas type and range of the new sensor cell is
correct.
5. 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.
6. Thread the splashguard adapter assembly onto the ITM to a snug fit and tighten the locking setscrew
using the 1 /
16
" Allen wrench.
7. Install the splashguard.
8. Check and perform zero calibration and span calibration as per Section 3.3.
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.
CXT-IR Instruction Manual Rev. 1.6 Page 35 of 44