6.4 Replacing a Passive Sensor (Cat Bead or MOS)
When the passive Catalytic Bead or MOS sensor is damaged or gradually losing sensitivity and eventually fails to respond to gas adequately or fails to pass
calibration, the sensor needs to be replaced. The mounting threads of the sensor head may require lubrication. Grease must not be used. As an alternate, PTFE
(Teflon) tape may be used on sensor threads.
To replace the passive sensors:
1. Declassify the area and make sure there is no hazardous gas/vapor present.
2. Power down the S5000 transmitter.
3. Unscrew the lid.
4. Remove the User Interface Module.
5. Refer to the sensor wiring diagram label inside the S5000 transmitter to locate the sensor connector and unplug it from the transmitter.
6. Unscrew the sensor head until it is totally off. Guide the sensor wires so they will not get caught by the internal parts of the S5000 while sensor head is
turning.
7. Guide the connector and wires of the new sensor head through the conduit entry for sensor. Do not plug in the sensor connector at this time.
8. Screw in the new sensor head. Guide the sensor wires so they will not get caught by the internal parts of the S5000 while sensor head is turning.
9. Verify the sensor connector wiring against the wiring diagram.
10. Plug in the connector to the indicated header and make sure they are mated correctly.
6.5 Troubleshooting
Table 17 Troubleshooting
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