Emerson 3000 World Class, Instruction Bulletin, Table A-2.Fault Finding Continued, Symptom, Check

World Class 3000

Instruction Bulletin

Appendix A Rev. 3.9 May 2005

Table A-2. Fault Finding (Continued)

Symptom Check Fault Remedy

2.System responds to oxygen concentration changes but does not give correct indication

	Good response, with	Recorder or remote	Calibration error	Recalibrate recorder or
	incorrect indication	indicator		indicator. Reference Re-
				corder Instruction Manual.
		System calibration	Calibration error	Recalibrate system.
		Probe mounting and con-	Air ingress into duct	Stop air leaks or resite
		dition of duct		probe.
		Cell mV input to	Failure of electronics	Check electronics
		electronics		package.
3. System does not give		Calibration gas input port	Blocked port	Clean port. If the flue gas
	accurate indication of			is condensing in the cali-
	applied calibration gas			bration gas line, insulate
				the back of the probe.
				Make sure that the cali-
				bration gas line is capped
				between calibrations, or a
				check valve is installed.
		Ceramic diffusion element	Diffusion element cracked,	Replace diffusion element.
			broken, or missing
4.	System takes a long	Diffusion element	Plugged diffusion element	Change diffusion element
	time to return to flue			or snubber diffusion
	gas value after calibra-			element.
	tion gas is turned off
5.	Probe passes calibra-	Check calibration gas fit-	Leak in gasket, or calibra-	Repair leak.
	tion, but appears to	ting.	tion gas fittings or tubing.
	read high.	Check calibration gas	Leak in calibration gas	Repair hose or tubing/
		hoses or tubing.	hose or tubing.
		Cell flange corrugated	Leaking seal.	Replace seal.
		seal.
		If equipped with an abra-	Leaking gasket.	Replace gasket.
		sive shield, check flange
		mounting gasket.
6.	Probe passes calibra-	Flow calibration gas to the	Plugged diffuser element	Replace diffuser.
	tion, but appears to	probe until reading stabi-	from high process par-
	read low.	lizes. Shut off calibration	ticulate may cause a cali-
		gas and note the time re-	bration shift.
		quired to return to process
		gas values. Time should
		be <20 sec. (<40 sec. for
		hazardous area probes).

Rosemount Analytical Inc. A Division of Emerson Process Management Appendices A-13