Analytical Industries GPR-2600 Series Oxygen Analyzer - Manual (Page 44)

Advanced Instruments Inc.
44
6 Maintenance
There are no moving parts in the analyzer given the modular nature of the electronics and sensor. Cleaning the electrical
contacts when replacing the sensor is the extent of the maintenance requirements of this analyzer. Serviceability: Except for
replacing the oxygen sensor, there are no parts inside the analyzer for the operator to service. Only trained personnel with the
authorization 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 are
influenced by the user and therefore difficult to predict. The sections dealing with Specification and Installation Considerations
define the normal operating conditions and expected life of the standard sensor utilized by the GPR-2600 analyzer. As a general
guideline, 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 touched
or ingested, refer to the Material Safety Data Sheet contained in the Owner’s Manual appendix. Avoid contact with any liquid or
crystal type powder in or around the sensor or sensor housing, as either could be a form of electrolyte. Leaking sensors should
be 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 the
flow housing with the right hand.
3. Unscrew the lock ring located at the rear of the sensor to separate the sensor from the molded
cable/plug assembly.
4. Remove the new oxygen sensor from the bag and remove the shorting device from the male
connector 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 the
male 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 male
connector 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 the
right 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 of
the 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 of
oxygen (once reinstalled).
14. Caution: Minimize the time the new sensor is exposed to ambient air.