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8 troubleshooting – Analytical Industries GPR-2500 A Oxygen Analyzer User Manual

Page 34

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34


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, and
see Section 6 - Maintenance.




Use voltmeter and determine uA or mV
output and contact factory.

High oxygen reading

Inadequate control of pressure and
flow rate

Abnormality in span gas

See Section 5 - Operation,
Getting Started,
Control of Pressure and Flow

Qualify source