Analytical Industries GPR-3100 Series Oxygen Purity Analyzer - Manual (Page 31)

Advanced Instruments Inc.
6 Maintenance
GPR-3100 Rev 7/2004 6 1
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. 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.
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.
Sensor Replacement Procedure
1. Using the 5/16 wrench supplied loosen but do not
remove the clamp bolt.
2. Rotate the upper section of the sensor housing 90º to
disengage from the clamp.
3. Remove the upper section by pulling it straight up and
place it on a smooth surface.
4. Remove the old oxygen sensor and dispose of it in
accordance with local regulations for disposing of
batteries.
5. Remove the new oxygen sensor from the shipping bag.
6. Remove the red label and the gold ribbon (shorting
deveice) from the PCB at the rear of the sensor.
7. Caution: Minimize the time the sensor is exposed to
ambient air.
8. Place the new sensor in the bottom section of the sensor housing with the PCB facing up.
9. Place the upper section of the sensor housing over the sensor.
10. Gently push the upper section downward and rotate 90º to engage the clamp.
11. Finger tighten the clamp bolt
12. Tighten the clamp bolt it one full turn with the 5/16 wrench to compressed the o-ring seal.
13. Sensor replacement is complete proceed to Zero and Span Calibration.