TX6351 • TX6352 User Manual
48 P5536.1600 rev B
P5536.1600 rev B 49
5. Diagnostics and Maintenance
5.1 Diagnostic Messages
Sensor over-range
Loss of signal from the sensor
Pellistor Over
•
The
gas
sensing
concentration
exceeds 100% LEL which is the
safe working limit of the sensing
element.
• The transmitted output signal from the sensor will be clamped at full
scale to prevent ambiguous output data from being transmitted and
will latch in this condition
• The pellistor in the gas sensing module will be switched into a
PROTECT state to prevent oxidisation damage and will latch in this state.
• Check that the gas concentration has receded, then reset the module
by removing it for 2 seconds.
Module Not Fitted
• The eModule has been removed
and is out for more than 10 seconds
Checkpoint
• Under-range output signal will be transmitted by the sensor.
5.2 Maintenance
Output Signal
• Check the accuracy of the sensor at
pre-determined intervals by injecting
a test gas
Gas Sensing Modules
• The Sentro eModules should be
changed at regular intervals to ensure
the accuracy of response
• Service history is logged within the
module and this data is used to
periodically assess its condition whenever
it is returned for servicing. Simply insert
the new module into the instrument and
return the original for checking and
calibration.
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