7.3 Transmitter Replacement
The transmitter assembly should be replaced when it is determined that it is unreliable, noisy or cannot be adjusted for
calibration. This may occur due to age, corrosion or failed components.
To replace the transmitter assembly:
1. Remove the cover of the main enclosure.
2. Unscrew the two thumb screws in the top of the cover plate, lift the assembly and rotate 90
o
to relieve the wiring
service loop.
3. Remove all wires from bond, marking them carefully so they can be correctly replaced.
4. Unplug the sensor connector from the transmitter.
5. Reverse the preceding steps to install the new transmitter.
6. Restore power and allow a minimum of 30 minutes for stabilization before re-calibration.
7.4 Sensor Replacement
NOTE:Refer to Section 14 Gas Sensor Module Calibration for information on sensor electrolyte replacement
for 5100-25-IT and 5100-26-IT.
The gas sensor which is located inside the sensor assembly housing can be replaced without replacement of the housing.
The gas sensor needs replacement when:
• The “CAL-FAIL” message appears after calibration.
• The sensor output signal is noisy, causing erroneous gas level readings.
• The “Sensor Failure” message displays.
To replace the sensor:
1. Confirm that system power has been removed.
2. Remove the gas sensor module enclosure cover.
3. Unscrew the two thumb screws in the top of the faceplate, lift the transmitter assembly and rotate 90
o
to relieve the
wiring service loop.
4. Unplug the sensor connector from the transmitter.
5. Unscrew the old sensor assembly from the enclosure conduit hub. Remove the sensor assembly with its harness.
6. Unscrew sensor housing cover from the sensor.
7. Carefully pull the old sensor straight up from the socket.
8. Press the new sensor into the socket.
9. Reverse the preceding steps to install the sensor assembly.
10. Allow the new sensor to stabilize for a minimum of 60 minutes and then calibrate using the procedure in Section 6
Calibration.
36 SMC 5100-XX-IT Toxic Gas Detector Module
7 Service US
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