GPR-1800 AIS ATEX Trace PPM Oxygen Analyzer - Advanced ...

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Advanced Instruments Inc.6 MaintenanceGenerally, cleaning the electrical contacts or replacing filter elements is the extent of the maintenance requirements of thistransmitter.Sensor ReplacementPeriodically, the oxygen sensor will require replacement. The operating life is determined by a number of factors that areinfluenced by the user and therefore difficult to predict. The Features & Specifications define the normal operating conditionsand expected life of the standard sensor utilized by the GPR-1800AIS transmitter. Expected sensor life is inversely proportionalto changes in oxygen concentration, pressure and temperature.Serviceability: Except for replacing the oxygen sensor, there are no parts inside the transmitter for the operator to service.Only trained personnel with the authorization of their supervisor should conduct maintenance.Caution: DO NOT open the oxygen sensor. The sensor contains a corrosive liquid electrolyte that could be harmful if touchedor ingested, refer to the Material Safety Data Sheet contained in the Owner’s Manual. Avoid contact with any liquid or crystaltype powder in or around the sensor or sensor housing, as either could be a form of electrolyte. Leaking sensors should bedisposed of in accordance with local regulations.Procedure:1. Remove the four (4) screws securing the transmitter’s front panel.2. Caution: Do not discard the gaskets from the enclosure.3. Using the 5/16 wrench supplied loosen but do not remove the clamp bolt located in thecenter of the housing with the elbows attached.4. Rotate the upper section of the sensor housing 90º to disengage from the clamp.5. Remove the upper section by pulling it straight up and place it on a smooth surface.6. Remove the old oxygen sensor and dispose of it as you would a battery.7. Remove the new oxygen sensor from the shipping bag.8. Remove the red label and the gold ribbon (shorting device) from the PCB at the rear of thesensor.9. Caution: Minimize the time the sensor is exposed to ambient air.10. Place the new sensor in the bottom section of the sensor housing with the PCB facing up.11. Place the upper section of the sensor housing over the sensor.12. Span Calibrate the transmitter in 20.9% ambient air, once the reading stabilizes – seeabove.13. Gently push the upper section downward and rotate 90º to engage the clamp.14. Finger tighten the clamp bolt and one full turn with the 5/16 wrench to compressed the o-ring seal.15. Connect zero gas or low oxygen content sample gas line to purge the sensor of oxygen.30
Advanced Instruments Inc.7 Spare PartsRecommended spare parts for the GPR-1800AIS ppm Oxygen Transmitter:Item No.GPR-12-333XLT-12-333Descriptionppm Oxygen Sensorppm Oxygen SensorOther spare parts:Item No.HTR-1004A-1004-2-14A-1016-AB-2762-A-2-14MTR-1011MTR-1014ORNG-1007A-1151-AIS-1A-1166-AIS-ACA-1166-AIS-DCDescriptionHeater Low Power Sensor HousingHousing Sensor Stainless SteelHousing Sensor Bottom Assembly Stainless SteelHousing Sensor Upper Assembly Stainless SteelMeter Digital Panel LCD BacklightMeter Digital Panel LCD Low TemperatureO-ring 3/32 x 1-3/8 x 1-9/16 VitonPCB Assembly Main / DisplayPCB Assembly Interconnection / AC Power SupplyPCB Assembly Interconnection / DC Power Supply8 TroubleshootingSymptom Possible Cause Recommended ActionSlow recovery orAt 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 transmitter)Replace sensorReplace sensorHigh O 2 readingafter installingor replacing sensorTransmitter 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 transmitter)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 present31
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