Owner manual

Advanced Instruments Inc.
8 Troubleshooting
Symptom Possible Cause Recommended Action
Reading does not
reflect expected values
Sensor was not calibrated at the
pressure, flow rate and temperature
anticipated in the sample gas stream
Recalibrate the analyzer
Oxygen reading drifts
toward zero or
significant number of
turns of the span
control adjustment is
required to calibrate the
analyzer.
Indication sensor is nearing the end of
its useful life
Replace sensor, see Section 6 -
Maintenance.
Slow response time
Erratic oxygen reading
No oxygen reading
Liquid covering sensing membrane
Presence of interference gases.
Unauthorized maintenance
Defective electrical connection
Sensor failure
Gently remove with alcohol and
lint free towel.
Consult factory, replace sensor,
see Section 6 - Maintenance.
Use voltmeter and determine uA or
mV output and contact factory.
High oxygen reading Inadequate control of pressure and
flowrate
Abnormality in span gas
See Section 5 - Operation,
Getting Started,
Control of Pressure and Flow
Qualify source
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