Analytical Industries GPR-3500 MO Portable Oxygen Analyzer - Manual (Page 13)

Advanced Instruments Inc.
13
Installing the Oxygen Sensor
The GPR-3500MO portable oxygen purity analyzer is equipped with an integral oxygen sensor. It has
been tested and calibrated by the manufacturer prior to shipment and are fully operational from the
shipping container. However, when the application requires a remote sensor (external to the electronics
enclosure) or other special circumstances, the oxygen sensor will be packaged separately and must be
installed prior to operating the portable oxygen purity analyzer. If the sensor has not been installed at
the factory, it will be necessary to install the sensor in the field.
Caution: All portable oxygen purity analyzers must be calibrated once the installation has been
completed and periodically thereafter as described below. Do not change the factory settings until
instructed to do in this manual.
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 section. 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 manner similar to that of a common battery in
accordance with local regulations.
Procedure:
1. Remove the four (4) screws securing the top section of the enclosure, set them aside for reinstallation and remove the front cover.
2. Caution: Do not remove or discard the gasket from the enclosure. Failure to reinstall the gasket will void the NEMA 4 rating and
RFI protection.
3. Remove the oxygen sensor from the bag.
4. Screw the oxygen sensor into the sensor flow housing, equipped with elbows and tubing, finger tighten plus one half (1/2) turn to
ensure a good seal from the o-ring affixed to the sensor.
5. Remove the shorting device (looped wire) from the receptacle located at the rear of the sensor. Minimize the time the sensor is
exposed to ambient air.
6. Assure the keyway registration of the female plug on the cable and male receptacle on the sensor match up.
7. Push the female plug (including the knurled lock nut) molded to the cable into the male receptacle attached to the new sensor.
8. Screw the knurled lock nut attached the cable onto to the male connector attached to the sensor, tighten finger tight plus ¼ turn.
9. Replace the front cover of the portable oxygen purity analyzer and ensure that the gasket is replaced as well to maintain CE
approval and NEMA 4 rating.
10. Tighten the four (4) screws to secure the front cover.
11. Connect the gas lines, vent line first, as previously described.
12. Proceed to calibration.