Emerson ROSEMOUNT OCX 8800 - Manual (Page 102)

Instruction Manual
IM-106-880, Rev 1.0
January 2007
OCX 8800
7-4
SB Temp Hi (Sample block heater temperature high, > 190ºC)
Probable Cause Recommended Corrective Action
High noise in OCX power supply Check power supply for line noise or voltage fluctuations. Install power line filter kit
(PN 6A00171G01) or high quality line filter for input power.
O2 Temp Very Hi (Oxygen sensor heater over maximum temperature, > 820ºC)
O2 Htr Rmp Rate (Oxygen sensor heater over maximum temperature ramp rate)
Probable Cause Recommended Corrective Action
Incorrect O
2
heater wiring Check O
2
heater wiring per Figure 7-3 and Figure 6-6. Check the wiring at the heater
and inside the electronics housing. Correct wiring fault. Perform Reset procedure in
Section 3, Configuration and Startup to continue operation.
Incorrect O
2
thermocouple wiring Check O
2
thermocouple wiring per Figure 7-3 and Figure 6-6. Check the wiring at the
thermocouple and inside the electronics housing. Correct wiring fault. Perform Reset
procedure in Section 3, Configuration and Startup to continue operation.
Electronics package failure Replace electronics package.
COe Temp Very Hi (Combustion sensor heater over maximum temperature, > 400ºC)
COe Htr Rmp Rate (Combustibles sensor heater over maximum temperature ramp rate)
Probable Cause Recommended Corrective Action
Incorrect COe heater wiring Check COe heater wiring per Figure 7-3 and Figure 6-7. Check the wiring at the heater
and inside the electronics housing. Correct wiring fault. Perform Reset procedure in
Section 3, Configuration and Startup to continue operation.
Incorrect COe thermocouple wiring Check COe thermocouple wiring per Figure 7-3 and Figure 6-7. Check the wiring at the
thermocouple and inside the electronics housing. Correct wiring fault. Perform Reset
procedure in Section 3, Configuration and Startup to continue operation.
Electronics package failure Replace electronics package.
SB Temp Very Hi (Sample block heater over maximum temperature, > 260ºC)
SB Htr Rmp Rate (Sample block heater over maximum temperature ramp rate)
Probable Cause Recommended Corrective Action
Incorrect sample block heater wiring Check sample block heater wiring per Figure 7-3 and Figure 6-6. Check the wiring at
the heater and inside the electronics housing. Correct wiring fault. Perform Reset
procedure in Section 3, Configuration and Startup to continue operation.
Incorrect sample block thermocouple wiring Check sample block thermocouple wiring per Figure 7-3 and Figure 6-6. Check the
wiring at the thermocouple and inside the electronics housing. Correct wiring fault.
Perform Reset procedure in Section 3, Configuration and Startup to continue operation.
Electronics package failure Replace electronics package.
O2 TC Open (Oxygen sensor heater thermocouple open)
Probable Cause Recommended Corrective Action
O
2
thermocouple or thermocouple circuit open Check O
2
thermocouple and circuit wires for breaks or loose connections per Figure 7-3
and Figure 6-6. Repair breaks or loose connections or replace failed thermocouple.
Perform Reset procedure in Section 3, Configuration and Startup to continue operation.
COe TC Open (Combustibles sensor heater thermocouple open)
Probable Cause Recommended Corrective Action
Combustibles sensor thermocouple open Check thermocouple resistance (lead to ground) of reference and active thermocouples
per Figure 7-3 and Figure 6-7. If either thermocouple is open or shorted to ground,
replace combustibles sensor.
Table continued on next page