GPR-2600 Series Oxygen Analyzer - Advanced Instruments Inc.

Advanced Instruments Inc.8 TroubleshootingSymptom Possible Cause Recommended ActionSlow recoveryAt installation, defective sensorAir leak in sample system connection(s)Abnormality in zero gasDamaged in service - prolonged exposure toair, electrolyte leakSensor nearing end of lifeReplace sensor if recovery unacceptable or O 2reading fails to reach 10% of lowest rangeLeak test the entire sample system: Vary the flowrate, if the O 2 reading changes inversely with thechange in flow rate indicates an air leak - correctsource of leakQualify zero gas (using portable analyzer)Replace sensorReplace sensorHigh O 2 readingafter installingor replacing sensorAnalyzer calibrated before sensor stabilizedcaused by:1) Prolonged exposure to ambient air, worseif sensor was unshorted2) Air leak in sample system connection(s)3) Abnormality in zero gasAllow O 2 reading to stabilize before making thespan/calibration adjustmentContinue purge with zero gasLeak test the entire sample system (above)Qualify zero gas (using portable analyzer)High O 2 readingSamplingFlow rate exceeds limitsPressurized sensorImproper sensor selectionCorrect pressure and flow rateRemove restriction on vent lineReplace GPR/PSR sensor with XLT sensor whenCO 2 or acid gases are presentResponse time slowAir leak, dead legs, distance of sample line,low flow rate, volume of optional filters andscrubbersLeak test (above), reduce dead volume or increaseflow rateO 2 reading doesn’tagree to expected O 2valuesPressure and temperature of the sample isdifferent than span gasAbnormality in gasCalibrate the analyzer (calibrate at pressure andtemperature of sample)Qualify the gas (use a portable analyzer)47