Analytical Industries GPR-1900 Series Trace PPB Oxygen Analyzer - Manual (Page 31)

Advanced Instruments Inc.
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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-1900 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:
1. Remove the four (4) screws securing the analyzer’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 the
center 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 from the PCB at the rear of the sensor.
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 analyzer in 20.9% ambient air, once the reading stabilizes – see above.
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.
Connect zero gas or low oxygen content sample gas line to purge the sensor of oxygen.
7 Spare Parts
Recommended spare parts for the GPR-1900 Oxygen Analyzer include:
Item No. Description
GPR-12-333 ppm Oxygen Sensor
XLT-12-333 ppm Oxygen Sensor (CO2 background gas)
Other spare parts:
A-1004-1-36 Housing Sensor Stainless Steel
A-1016-A Housing Sensor Bottom Assembly Stainless Steel
B-2762-A-1-36 Housing Sensor Upper Assembly Stainless Steel
MTR-1011 Meter Digital Panel LCD Backlight
ORNG-1007 O-ring 3/32 x 1-3/8 x 1-9/16 Viton
A-1161-A1 PCB Assembly Main / Display
A-1162-AC PCB Assembly AC Power Supply / Interconnection
A-1162-DC PCB Assembly AC Power Supply / Interconnection