Emerson oxymitterdr hazardous area in-siu oxygen probe, ib-106-340cdr Section Troubleshooting

Hazardous Area Oxymitter DR

Instruction Manual

IB-106-340CDR Original Issue January, 2002

SECTION 5

TROUBLESHOOTING

Install all protective equipment covers and safety ground leads after trouble- shooting. Failure to install covers and ground leads could result in serious injury or death.

5-1 OVERVIEW

Troubleshooting for the oxygen analyzer system is broken down to the main component level. In addition to the information in this section, instruc- tion bulletins for individual models also discuss troubleshooting.

For Models 218, 225, and 132 (analog), refer to IB-106-101.

For Model 218A, refer to IB-106-101A.

For Model TC200, refer to IB-107-020.

For Model 132 (digital), refer to IB-106-106A.

For Yokogawa (YEW) ZA8C Converter, refer to original converter documentation.

5-2 PROBE TROUBLESHOOTING

a.Probe Faults

Listed below are the five symptoms of probe failure.

1.The system does not respond to changes in the oxygen concentration.

2.The system responds to oxygen changes but does not give the correct indication.

3.The system does not give an accept-

able indication of the value of the oxy- gen test gas being applied during cali-

bration.5

4.The probe takes a long time to return to flue gas value after the calibration gas is turned off.

5.The probe heater temperature is un- stable.

b.Symptoms

Table 5-1provides a guide to fault finding for the above symptoms.

Table 5-1. Fault Finding

SYMPTOM	CHECK	FAULT	REMEDY
1. No response to oxy-
gen concentration
change when:
Heater is cold and	Thermocouple continuity	Thermocouple failure	Replace thermocouple
TC mV output is less			or return probe to
than setpoint			Rosemount.
	Cold heater resistance	Heater failure	Replace heater or return
	should be 67 ohm to		probe to Rosemount.
	77 ohm
	Triac O/P to heater	Failure of electronics	Check electronics pack-
			age.

Rosemount Analytical Inc. A Division of Emerson Process Management Troubleshooting 5-1