Analytical-industries GPR-1600 Series Trace PPB Oxygen Analyzer Manuel d'utilisateur télécharger pdf (Page 49)

Advanced Instruments Inc.

8 Troubleshooting

Symptom Possible Cause Recommended Action

Slow recovery

At installation, defective sensor

Air leak in sample system connection(s)

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 selection

Correct pressure and flow rate

Remove restriction on vent line

Replace GPR/PSR sensor with XLT sensor when

or acid gases are present

Response time slow

Air leak, dead legs, distance of sample line,

low flow rate, volume of optional filters and

scrubbers

Leak test (above), reduce dead volume or increase

flow rate

reading doesn’t

agree to expected O

values

Pressure and temperature of the sample is

different than span gas

Abnormality in gas

Calibrate the analyzer (calibrate at pressure and

temperature of sample)

Qualify the gas (use a portable analyzer)

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Analytical-industries GPR-1600 Series Trace PPB Oxygen Analyzer Manuel d'utilisateur Page 49

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