Analytical-industries GPR-2500 Series Oxygen Transmitter User Manual download pdf (Page 34)

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

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