Ametek Thermox CEM O2/TM, User Manual

Page: 122 / 168

6-6 | Thermox CEM O2/TM Analyzer
Temp Rise Failure
This indicates that the sensor has failed to increase a minimum of 10° C in
a 60-second time frame during start-up. Once the system reaches the op-
erating temperature set point, this message will appear only if the sensor
falls below the set point by 15° C and fails to recover within 60 seconds.
The problems that can cause this error are as follows:

AC line power problem at the sensor

Open furnace

Over-temperature protection circuit trip on the sensor board

Sensor board failure

Loss of furnace drive signal from control unit

Thermocouple failed (shorted or opened)

Interconnecting wiring problem

Polarity of thermocouple is incorrect
T/C (Thermocouple) Circuit Failure
This message appears when the control unit recognizes a sudden drop in
temperature (greater than 100° C). The thermocouple circuit failure mes-
sage can be the result of one of the following problems:

Shorted thermocouple

Faulty interconnecting wiring

Control unit display module failure

Sensor board failure
If this message is soon followed by a “Thermocouple Failure” message, see
that message for troubleshooting instructions.