Analytical-industries GPR-35 Oxygen Analyzer Manuel d'utilisateur télécharger pdf (Page 28)

Advanced Instruments Inc.

8 Troubleshooting

Symptom Possible Cause Recommended Action

Slow recovery or

response time

At installation, defective sensor

Failure to purge gas lines with Bypass, air leak in

connections, dead legs, distance of sample line, low

flow rate, volume of optional filters and scrubbers

Abnormality in zero gas

Damaged in service - prolonged exposure to air,

electrolyte leak

Sensor nearing end of life

Replace sensor if recovery unacceptable or O

reading fails

to reach 10% of lowest range

Leak test the entire sample system:

Vary the flow rate, if the O

reading changes inversely with

the change in flow rate indicates an air leak - correct source

of leak

Qualify zero gas (using portable analyzer)

Replace sensor

High O

reading

after installing or

replacing sensor

Analyzer calibrated before sensor stabilized caused

by:

1) Prolonged exposure to ambient air, worse if

sensor was unshorted

2) Air leak in sample system connection(s)

3) Abnormality in zero gas

Allow O

reading to stabilize before making the

span/calibration adjustment

Continue purge with zero gas

Leak test the entire sample system (above)

Qualify zero gas (using portable analyzer)

High O

reading

Sampling

Flow rate exceeds limits

Pressurized sensor

Improper sensor - CO

affects GPR sensor

Abnormality in gas

Correct pressure and flow rate

Remove restriction on vent line, replace sensor

Use XLT sensor when CO

or acid gases are present

Qualify the gas (use a portable analyzer)

Reading doesn’t agree

to expected O

values

Pressure and temperature of the sample is different

than span gas

Abnormality in gas

Failure to allow reading to stabilize before zero

and/or span calibration adjustments

Calibration error caused by turning the zero and/or

span potentiometer more than ½ turn at a time

(electronics need time to keep up

Calibrate the analyzer (calibrate at pressure and

temperature of sample)

Qualify the gas (air calibrate and/or use portable analyzer)

Repeat calibration procedure and allow reading (sensor) to

stabilize

Repeat calibration, allow reading to stabilize and make

adjustments ½ turn at a time

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Analytical-industries GPR-35 Oxygen Analyzer Manuel d'utilisateur Page 28

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