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Instruction Manual
IB-106-340CDR Original Issue
January, 2002
Rosemount Analytical Inc. A Division of Emerson Process Management Troubleshooting 5-1
Hazardous Area Oxymitter DR
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.
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 5-1 provides 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
TC mV output is less
than setpoint
Thermocouple continuity Thermocouple failure Replace thermocouple
or return probe to
Rosemount.
Cold heater resistance
should be 67 ohm to
77 ohm
Heater failure Replace heater or return
probe to Rosemount.
Triac O/P to heater Failure of electronics Check electronics pack-
age.
5