GPR-18 MS ATEX Explosion Proof PPB Oxygen Analyzer.

Advanced Instruments Inc.Symptom Possible Cause Recommended ActionErratic O 2 readingChange in sample pressureDirty electrical contacts in upper section of sensorhousingCorroded solder joints on sensor PCB from corrosivesample or electrolyte leakage from sensorCorroded spring loaded contact in upper section ofsensor housing from liquid in sample or electrolyteleakage from sensorLiquid covering sensing areaPresence of interference gasesPresence of sulfur gases and/or CO 2Unauthorized maintenanceRepeat calibration at the temperature and pressure ofsampleClean contacts with alcohol (minimize exposure time of MSsensor to ambient air to extent possible)Replace sensor and return sensor to the factory forwarranty determinationUpper section of sensor housing: Clean contacts withalcohol, flow sample or zero gas for 2-3 hours to flushsample system and sensor housingSensor: Replace if leaking and return it to the factory forwarranty determinationWipe with alcohol and lint free towel or flow sample or zerogas for 2-3 hours to flushConsult factoryReplace sensor and install scrubber, contact factoryReplace sensor, obtain authorized serviceNo O 2 readingNegative O 2 readingFailure of an electronic component or power surgethat sends a charge to the sensorPressurizing the sensor by:a) Flowing gas to the sensor with the vent restrictedor SHUT OFF valve closed and suddenly removingthe restriction draws a vacuum and can damage thesensor and/or cause electrolyte leakageb) Drawing a vacuum on the sensor by partiallyopening the FLOW valve upstream of the sensorwhen using a pump downstream to draw samplefrom a process at atmospheric pressure or a slightvacuum can damage the sensor and cause it to leakelectrolyteService the analyzer, check the power source and THENreplace the sensorIntroduce span gas to determine if the sensor responds.If successful calibrate the analyzer and resume samplingIf not successful, inspect for electrolyte leakage, check andclean the contacts in the upper section of the sensorhousing, flow a little warm water followed by air or cleansample through the analyzer for 2-3 hours to push theelectrolyte through the sample system and THEN replacethe sensor33