Analytical-industries GPR-1200 ATEX Portable Trace PPM Oxygen Analyzer Manuel d'utilisateur télécharger pdf (Page 29)

8 Troubleshooting

Symptom Possible Cause Recommended Action

Slow recovery

At installation – extended exposure to air

At installation – sensor housing not properly

tightened

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

Continue purging sensor with preferably N2 zero gas

or sample gas with low ppm oxygen concentration

Check and tighten bolt in center of bottom section of

sensor housing, purge sensor as above

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

Abnormality in gas

Correct pressure and flow rate

Remove restriction on vent line or open SHUT OFF

valve completely

Replace GPR/PSR sensor with XLT sensor when CO

or acid gases are present

Qualify the gas (use a portable analyzer)

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-1200 ATEX Portable Trace PPM Oxygen Analyzer Manuel d'utilisateur Page 29

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