Emerson Rosemount OCX 8800 Reference Manual page 208

Troubleshooting
Table 8-1: Troubleshooting
O2 Temp Very Hi (Oxygen sensor heater over maximum temperature, > 820 °C (1508 °F))
O2 Htr Rmp Rate (Oxygen sensor heater over maximum temperature ramp rate)
Probable cause
Incorrect O heater wiring
2
Incorrect O thermocouple wiring
2
Electronics package failure
COe Temp Very Hi (Combustion sensor heater over maximum temperature, > 400 °C (752 °F))
COe Htr Ramp Rate (Combustibles sensor heater over maximum temperature ramp rate)
Probable cause
Incorrect COe heater wiring
Incorrect COe thermocouple wiring
Electronics package failure
SB Temp Very Hi (Sample block heater over maximum temperature, > 260 °C (500 °F))
SB Htr Ramp Rate (Sample block heater over maximum temperature ramp rate)
Probable cause
Incorrect sample block heater wiring
Incorrect sample block thermocouple wiring
Electronics package failure
198
(continued)
Recommended corrective action
Check O heater wiring per
2
the heater and inside the electronics housing. Correct wir-
ing fault. Perform Reset procedure from
tinue operation.
Check O thermocouple wiring per
2
wiring at the thermocouple inside the electronics housing.
Correct wiring fault. Perform Reset procedure from
Chapter 3 to continue operation.
Replace electronics package.
Recommended corrective action
Check COe heater wiring per
at the heater and inside the electronics housing. Correct
wiring fault. Perform Reset procedure from
continue operation.
Check COe thermocouple wiring per
wiring at the thermocouple and inside the electronics
housing. Correct wiring fault. Perform Reset procedure
from Chapter 3 to continue operation.
Replace electronics package.
Recommended corrective action
Check sample block heater wiring per
wiring at the heater and inside the electronics housing.
Correct wiring fault. Perform Reset procedure from
Chapter 3 to continue operation.
Check sample block thermocouple wiring per
and Figure 9-7. Check the wiring at the thermocouple in-
side the electronics housing. Correct wiring fault. Perform
Reset procedure from Chapter 3
Replace electronics package.
Figure 8-3. Check the wiring at
Chapter 3 to con-
Figure 8-3 . Check the
Figure 8-3. Check the wiring
Chapter 3 to
Figure 8-3. Check the
Figure 8-3. Check the
Figure 8-3
to continue operation.
OCX 8800