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TE-WILBUR OPERATIONS MANUAL REV 002.15 06/11/2015
Tisch Environmental 1-TSP-AND-PM10 sales@tisch-env.com www.tisch-env.com Page 151 of 183
14.6 Temperature Sensors
The ambient temperature probe, part number TE-W-151, and the filter
temperature probe, part number TE-W-152, are both the same types of probes
so troubleshooting steps apply to both the ambient and filter temperatures.
The probes are PT100 RTDs (Resistive Temperature Devices). When at 0ºC
the resistance of the probe will be 100Ω and as temperature increases and
decreases, the resistance of the probe will increase and decrease respectively.
The probes are highly accurate when used for measuring ambient conditions
and are very linear throughout their temperature range.
Condition
Possible Cause
Possible Remedy
No reading or alarm
that sensor is
unplugged or failed
Sensor unplugged
Ensure the connector for the probe is seated
properly.
Sensor failed
Measure the resistance on terminals 13 and 14
for the ambient temperature and 15 and 16 for
the filter temperature. See the PT100 lookup
table to verify the correct resistance versus
temperature.
ºC Resistance of PT100 Temperature Sensor
Condition
Possible Cause
Possible Remedy
Sensor failed
If resistance does not match within 10% replace
the sensor.
If resistance is correct, but the temperature is
still not reading correctly or there is still an
alarm for sensor unplugged or failed, replace
the PLC analog input/output card.
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