SMC sierra monitor corporation | Sentry Instruction Manual - Version 6 |
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.