GPR-2600 Series Oxygen Analyzer - Advanced Instruments Inc.

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Advanced Instruments Inc.6 MaintenanceThere are no moving parts in the analyzer given the modular nature of the electronics and sensor. Cleaning the electricalcontacts when replacing the sensor is the extent of the maintenance requirements of this analyzer. Serviceability: Except forreplacing the oxygen sensor, there are no parts inside the analyzer for the operator to service. Only trained personnel with theauthorization of their supervisor should conduct maintenance.Sensor Replacement:Periodically, 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 sections dealing with Specification and Installation Considerationsdefine the normal operating conditions and expected life of the standard sensor utilized by the GPR-2600 analyzer. As a generalguideline, expected sensor life is inversely proportional to changes in oxygen concentration, pressure and temperature.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 appendix. Avoid contact with any liquid orcrystal type powder in or around the sensor or sensor housing, as either could be a form of electrolyte. Leaking sensors shouldbe disposed of in accordance with local regulations.Procedure – Standard Sensor and Flow Housing:1. Open the front door of the analyzer electronics enclosure.2. With the left hand hold the gas connections of the housing and unscrew the oxygen sensor from theflow housing with the right hand.3. Unscrew the lock ring located at the rear of the sensor to separate the sensor from the moldedcable/plug assembly.4. Remove the new oxygen sensor from the bag and remove the shorting device from the maleconnector located at the rear of the sensor.5. Look for the registration keyway and push the female plug at the end of the molded cable into themale connector located at the rear of the sensor.6. Screw the lock ring attached to the molded cable/plug assembly onto the threads of the maleconnector at the rear of the sensor.7. Finger tighten only.8. With the left hand hold the gas connections of the housing and screw the oxygen sensor into the flow housing with theright hand.9. Calibrate the analyzer as described above.Procedure – Optional Sensor and Sensor Housing:1. Open the door of the analyzer to access the sensor housing.2. Using the 5/16 wrench supplied loosen but do not remove the clamp bolt located in the center ofthe bracket attached to bottom section with the elbow fittings.3. Rotate the upper section of the sensor housing 90º to disengage from the clamp.4. Remove the upper section by pulling it straight up and place it on a smooth surface.5. Remove the old oxygen sensor and dispose of it as you would a battery.6. Remove the o-ring from the bottom section of the sensor housing.7. Wipe the o-ring with a damp lint free cloth.8. Lightly lubricate the o-ring with vacuum grease for optimal seal.9. Reinstall the o-ring into the bottom section of the sensor housing.10. From the MAIN MENU select AUTO RANGING as described above.11. If equipped with SAMPLE/BYPASS valve, place it in the SAMPLE position.12. Set the flow rate to 2 SCFH.13. Connect zero gas or low oxygen content sample gas line to purge the lines and the sensor ofoxygen (once reinstalled).14. Caution: Minimize the time the new sensor is exposed to ambient air.44
Advanced Instruments Inc.15. Remove the new oxygen sensor from the shipping bag.16. Remove the red label and the gold ribbon (shorting device) from the PCB at the rear of the sensor.17. Place the new sensor in the bottom section of the sensorhousing with the PCB facing up.18. Place the upper section of the sensor housing over the sensor.19. Gently push the upper section downward and rotate 90º toengage the clamp.20. Finger tighten the clamp bolt and one full turn with the 5/16wrench to compressed the o-ring seal.21. Expect the analyzer reading to recover to ppb levels asdescribed in the analyzer specification.22. Perform the desired calibration(s).23. Begin sampling once the analyzer has reached the value of the purge gas.45
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GPR-2600 Series Oxygen Analyzer - Advanced Instruments Inc.

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