Analytical-industries GPR-35 Oxygen Analyzer Manuel d'utilisateur télécharger pdf (Page 25)

Advanced Instruments Inc.

6 Maintenance

With exception of components related to optional equipment and charging the battery of portable analyzers, cleaning the

electrical contacts when replacing the sensor is the extent of the maintenance requirements of this analyzer as there are no

serviceable parts in the analyzer given the nature of the solid state electronics and sensor.

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 specification defines the normal operating conditions and

expected life of the sensors utilized by this analyzer. Expected sensor life is inversely

proportional to changes in oxygen concentration, pressure and temperature. Section

5 Operation describes the sensor’s operating characteristics and section 8

Troubleshooting addresses both common operating errors, corrective action and the

sensor’s actual mode of failure.

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. 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. Access the interior of the analyzer by removing the four (4) screws securing the

front panel.

2. Caution: Do not remove or discard the gasket from the front panel. Failure to

reinstall either gasket will void the NEMA 4 rating and RFI protection.

3. Unscrew the knurled lock nut connecting the cable to the sensor.

4. Disconnect and remove the female plug (including the knurled lock nut) molded

to the cable from the male receptacle attached to the sensor.

5. Remove the old sensor from any of the following: (a) unscrew it from the

threaded hole in the bottom of the enclosure, (b) unscrew it from the threaded

hole in the sensor flow housing or (c) unscrew the retaining nut securing the

remote sensor to the mounting bracket.

6. Open the barrier bag containing the new sensor.

7. If the sensor is equipped with a shorting loop, remove the shorting wire from the

pins of the female socket attached to the new sensor.

8. Note: Before attempting to air calibrate the analyzer refer to section 5

Operation, Span Calibration, Air Calibration Recommendations at this time;

otherwise skip this step.

9. Install the new sensor into any of the following: (a) screw it into the threaded

hole in the bottom of the enclosure, (b) screw it into the threaded hole in the

sensor flow housing or (c) screw the retaining nut securing the remote sensor to

the mounting bracket, finger tighten plus 1/2 turn and ensure the o-ring seal is engaged.

10. Assure the keyway registration of the female plug on the cable and male receptacle on the sensor match up.

11. Push the female plug (including the knurled lock nut) molded to the cable into the male receptacle attached to the new

sensor.

12. Screw and tighten the knurled lock nut attached the cable onto to the male connector attached to the sensor.

13. Replace the front panel or close the door and allow the reading to stabilize.

14. Calibrate the analyzer as described in section 5 Operation.

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Analytical-industries GPR-35 Oxygen Analyzer Manuel d'utilisateur Page 25

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