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SMC sierra monitor corporation Sentry Instruction Manual - Version 6
SERVICE
Page: 82
The SENSOR FAILURE message for ammonia sensors does
not indicate a specific failure of the sensor but indicates
that the sensor is not correctly connected to the
electronics. If this message appears check that the sensor
harness is correctly installed to the connector on the
bottom electronics board.
To replace the sensor assembly:
1. Confirm that system power has been removed.
2. Remove the transmitter electronics board from the
main housing and unplug the sensor harness from
the transmitter electronics.
3. Unscrew the sensor housing from the bottom of
the enclosure
4. Install the new sensor assembly into the enclosure
and tighten firmly.
5. Reconnect the sensor harness to the transmitter,
install the transmitter into the housing and restore
power.
6. Allow one hour for the sensor to stabilize prior to
recalibration.
7. Recalibrate the sensor module.