Analytical Industries GPR-2900 Series Oxygen Analyzer - Manual (Page 30)

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.
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-2900
analyzer. Expected sensor life is inversely proportional to changes in oxygen concentration, pressure and temperature.
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.
Procedure:
1. Unscrew the knurled lock ring connecting the cable to the sensor.
2. Disconnect and remove the female plug (including the knurled lock ring) molded to the cable from the male receptacle
attached to the old oxygen sensor.
3. Unscrew the old oxygen sensor from the threaded hole in the sensor flow housing.
4. Open the barrier bag containing the new sensor.
5. The new oxygen sensor is equipped with a wire spring type shorting device, remove the shorting wire from the pins of the
male receptacle attached to the new oxygen sensor.
6. Line up the registration point of the female plug molded to the cable and male receptacle on the oxygen sensor.
7. Push the female plug (including the knurled lock ring) into the male receptacle attached to the oxygen sensor.
8. Screw and finger tighten the knurled lock ring of the cable plug into to the male connector attached to the sensor.
9. Place the analyzer in the auto ranging mode, as described above.
10. With the sensor exposed to ambient air wait for 5-10 minutes until the reading stabilizes.
11. Perform and air calibration as described above.
12. Screw the new sensor, finger tight plus ¼ turn, into the threaded hole in the flow housing and ensure the o-ring seal is
engaged but not ‘crushed’.
13. Begin sampling.
7 Spare Parts
Recommended spare parts for the GPR-2900 Oxygen Analyzer include:
Item No. Description
GPR-11-60-4 Oxygen Sensor
XLT-11-24-4 Oxygen Sensor (CO2 background gas)
Other spare parts:
A-2070 Bracket Mount Remote Sensor
CONN-1014 Connector 4 Conductor Shielded Cable with Plug
A-2568 Housing Flow 1/8 SS Tube Fittings
MTR-1011 Meter Digital Panel LCD Backlight
A-2781 Nut Retain Remote Sensor
A-1161-A2 PCB Assembly Main / Display
A-1162-AC PCB Assembly AC Power Supply / Interconnection
A-1162-DC PCB Assembly AC Power Supply / Interconnection