Emerson OCX 8800 instruction manual Repair broken wire or loose connection

OCX 8800

Instruction Manual

IM-106-880, Rev 1.0 January 2007

ADC Failure (Voltage to digital conversion could not complete) ADC Ref Error (Voltage to digital conversion not accurate)

Probable Cause

Recommended Corrective Action

Incorrect wiring between electronics and sensor	Check all wiring between the electronics and sensor housings per Figure 8-3. Correct
housings	wiring faults.
Electronics package failure	Replace electronics package.

O2 Htr Failure (Oxygen sensor heater could not reach final temperature)

Probable Cause

Recommended Corrective Action

O2 heater circuit wiring open	Check O2 cell heater circuit for broken wire or loose connection per Figure 8-3 and
	Figure 7-4. Repair broken wire or loose connection.
O2 heater open	Check resistance of O2 heater per Figure 7-4. Normal O2 heater resistance is 62.5
	Ohms. Replace O2 heater if heater is open or has a large resistance.
Heater electronics failure	Check heater fuse F3 in electronics housing per Figure 8-1. If open, locate and correct
	cause of overload. If F3 is not open, or if cause of overload cannot be found, replace
	electronics package.

COe Htr Failure (Combustibles sensor heater could not reach final temperature)

Probable Cause

Recommended Corrective Action

COe heater circuit wiring open	Check COe heater circuit for broken wire or loose connection per Figure 8-3 and
	Figure 7-5. Repair broken wire or loose connection.
COe heater open	Check resistance of COe heater per Figure 7-5. Normal COe heater resistance is 97.7
	Ohms. Replace COe heater if heater is open or has a large resistance.
Heater electronics failure	Check heater fuse F3 in electronics housing per Figure 8-1. If open, locate and correct
	cause of overload. If F3 is not open, or if cause of overload cannot be found, replace
	electronics package.

SB Htr Failure (Sample block heater could not reach final temperature)

Probable Cause

Recommended Corrective Action

Sample block heater circuit wiring open	Check sample block heater circuit for broken wire or loose connection per Figure 8-3
	and Figure 7-4. Repair broken wire or loose connection.
Sample block heater open	Check resistance of sample block heater per Figure 7-4. Normal sample block heater
	resistance is 36.4 Ohms each (18.2 Ohms with both heaters in parallel). Replace
	sample block heater if heater is open or has a large resistance.
Heater electronics failure	Check heater fuse F4 in electronics housing per Figure 8-1. If open, locate and correct
	cause of overload. If F4 is not open, or if cause of overload cannot be found, replace
	electronics package.

Sensor housing exposed to high wind and/or extreme cold temperatures

If above probable causes are not causing the SB heater failure, install flange insulator (PN 6P00162H01).

Table continued on next page

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