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Manual
00809-0500-4880
Sensor Heater Over Temperature
The T/C Heater Alerts tab displays one of the following alarms:
1. O
2. Comb. Temp Very High
3. SB Temp. Very High
This alert indicates a very high heater temperature; temperature is rising too fast.
Potential cause
A heater over-temperature/out of control problem is generally caused by the
inability of the transmitter to limit power to the heater. This could be caused by a
shorted triac on the power supply in the electronics stack.
Recommended actions
Sensor Heater Temperature Variance
The following alarms may display on the T/C Heater Alerts tab:
1. O2 Cell Temp. Low
2. O2 Cell Temp. High
3. Comb. Temp. Low
4. Comb. Temp. High
5. SB Temp. Low
6. SB. Temp. High
This alert indicates a sensor heater temperature that is too high or too low.
Potential causes
Cell temperature may become erratic for the following reasons:
1. Temperature is settling during start-up.
2. There are large variations in process temperature or flow.
3. There are fluctuations or noise in the power supplied to the transmitter.
Recommended actions
Calibration Error
The Calibration Alerts tab may display the following alarms:
Rosemount OCX8800A
Cell Temp. Very High
2
1. Check heater wiring.
2. Check thermocouple wiring.
3. Replace the electronics stack.
1. Allow the transmitter several minutes to reach proper temperature.
2. Check power supply.
F
Fieldbus
™
OUNDATION
December 2022
123
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