Emerson OCX 8800 instruction manual SB Temp Hi Sample block heater temperature high, 190ºC

OCX 8800

Instruction Manual

IM-106-880, Rev 1.0 January 2007

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 O2 heater wiring	Check O2 heater wiring per Figure 8-3 and Figure 7-4. 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.
	Check O2 thermocouple wiring per Figure 8-3 and Figure 7-4. Check the wiring at the
Incorrect O2 thermocouple wiring
	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 8-3 and Figure 7-5. 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 8-3 and Figure 7-5. 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 8-3 and Figure 7-4. 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 8-3 and Figure 7-4. 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

O2 thermocouple or thermocouple circuit open	Check O2 thermocouple and circuit wires for breaks or loose connections per Figure 8-3
	and Figure 7-4. 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 8-3 and Figure 7-5. If either thermocouple is open or shorted to ground,
	replace combustibles sensor.
	Table continued on next page

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