Emerson Rosemount OCX8800A Manual page 220

Troubleshoot
December 2022
Potential cause
CJC sensor grounded.
Recommended actions
Potential cause
CJC sensor failed.
Recommended actions
9.3.3 O2 Temp Hi
Oxygen sensor heater temperature high, > 1381 °F (750 °C).
Potential cause
High noise in Rosemount OCX8800 power supply.
Recommended actions
9.3.4 COe Temp Hi
Combustion sensor heater temperature high, > 590 °F (310 °C).
Potential cause
High noise in Rosemount OCX8800 power supply.
Recommended actions
9.3.5 SB Temp Hi
Sample block heater temperature high, > 374 °F (190 °C).
220
2. Replace COe sensor if resistance of sensor element is not between 100
and 250 ohms.
1. Check resistance of CJC sensor to ground per
2. Replace CJC sensor if resistance is less than 10M ohms.
1. Check resistance CJC sensor per
2. Replace CJC sensor if resistance of sensor element is not between 100
and 150 ohms.
1. Check power supply for line noise or voltage fluctuations.
2. Install power line filter kit (PN 6A00171G01) or high quality line filter for
input power.
1. Check power supply for line noise or voltage fluctuations.
2. Install power line filter kit (PN 6A00171G01) or high quality line filter for
input power.
Figure 10-9.
Figure 10-9.
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