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Instruction Manual
IB-106-340CDR Original Issue
January, 2002
5-2 Troubleshooting Rosemount Analytical Inc. A Division of Emerson Process Management
Hazardous Area Oxymitter DR
Table 5-1. Fault Finding (Continued)
SYMPTOM CHECK FAULT REMEDY
Heater is hot and
T/C mV output is at
setpoint ±0.2 mV
Recorder chart Recorder failure See Recorder Instruction
Manual.
Cell mV input to elec-
tronics and cell mV at
probe head
No cell mV at probe
when test gas applied
Replace cell or return
probe to Rosemount.
Probe cell mV OK but no
input to electronics
Check out cable con-
nection.
Cell mV satisfactory both
at junction box and input
to electronics - failure of
electronics
Check electronics pack-
age.
2. System responds to
oxygen concentra-
tion changes but has
incorrect indication
Good response, with
incorrect indication
Recorder or remote
indicator
Calibration error Recalibrate recorder or
indicator. Reference Re-
corder Instruction Man-
ual.
System calibration Calibration error Recalibrate system. Re-
place cell if necessary.
Probe mounting and
condition of duct
Air ingress into duct Stop air leaks or resite
probe.
Cell mV input to elec-
tronics
Failure of electronics Check electronics pack-
age.
3. Probe does not give
accurate indicationof
applied test gas
Test gas input port Blocked port Clean port. If the flue
gas is condensing in the
test gas line, insulate the
back of the probe. Make
sure that the test gas
line is capped between
calibrations, or a check
valve is installed.
Ceramic diffusion ele-
ment broken
Diffusion element
cracked, broken, or
missing
Replace diffusion ele-
ment.
4. Probe takes a long
time to return to flue
gas value after
calibration gas is
turned off
Plugged diffusion ele-
ment
Plugged diffusion ele-
ment
Change diffusion ele-
ment or snubber diffu-
sion element.
5. Probe heater
temperature unstable
Proper voltage heater is
installed
Wrong heater Change heater to proper
voltage.