Analytical-industries GPR-2900 Series Oxygen Analyzer Manuel d'utilisateur télécharger pdf (Page 14)

Advanced Instruments Inc.

Installing the Oxygen Sensor

The GPR-2900 Oxygen Analyzer is equipped with an external oxygen sensor. They have been tested and calibrated by the

manufacturer prior to shipment and are fully operational from the shipping containers. The sensor has not been installed at the

factory and it will be necessary to install the sensor in the field.

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 manner similar to that of a common battery in accordance with local regulations.

Procedure:

1. As described above the following steps should already be completed:

a) Locate and secure the sensor flow housing with two 6/32 mounting screws, in the preferred position the threaded

female should be facing the ceiling;

b) connect the gas lines;

c) electrical connections.

2. Open the barrier bag containing the new sensor.

3. The 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 sensor.

4. Line up the registration point of the female plug molded to the cable and male receptacle on the oxygen sensor.

5. Push the female plug (including the knurled lock ring) into the male receptacle attached to the oxygen sensor.

6. Screw and finger tighten the knurled lock ring of the cable plug into to the male connector attached to the sensor.

7. Place the analyzer in the auto ranging mode, see below.

8. With the sensor exposed to ambient air wait for 5-10 minutes until the reading stabilizes.

9. Perform and air calibration as described below.

10. 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’.

11. Begin sampling.

Span Gas Preparation

A percent analyzer such as the GPR-2900 may be reliable calibrated with the known 20.9% oxygen content of ambient air and

operated confidently at the lowest levels of the most sensitive analysis range. However, the GPR-2900 may be calibrated with

span gas at the user’s discretion.

Caution: Do not contaminate the span gas cylinder when connecting the regulator. Bleed the air filled regulator (faster and

more reliable than simply flowing the span gas) before attempting the initial calibration of the instrument.

Required components:

¾ Certified span gas cylinder with an oxygen concentration, balance nitrogen, approximating 80% of the full scale range

above the intended measuring range.

¾ Regulator to reduce pressure to between 5 and 30 psig.

¾ Flow meter to set the flow between 1-5 SCFH,

¾ Suitable fittings and 1/8” dia. 4-6 ft. in length of metal tubing to connect the regulator to the flow meter inlet

¾ Suitable fitting and 1/8” dia. 4-6 ft. in length of metal tubing to connect from the flow meter vent to tube fitting designated

SAMPLE IN on the GPR-2900.

Procedure:

1. With the span gas cylinder valve closed, install the regulator on the cylinder.

2. Open the regulator’s exit valve and partially open the pressure regulator’s control knob.

3. Open slightly the cylinder valve.

4. Loosen the nut connecting the regulator to the cylinder and bleed the pressure regulator.

5. Retighten the nut connecting the regulator to the cylinder

6. Adjust the regulator exit valve and slowly bleed the pressure regulator.

7. Open the cylinder valve completely.

8. Set the pressure between 5-30 psig using the pressure regulator’s control knob.

9. Caution: Do not exceed the recommended flow rate. Excessive flow rate could cause the backpressure on the sensor

and may result in erroneous readings and permanent damage to the sensor.

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Analytical-industries GPR-2900 Series Oxygen Analyzer Manuel d'utilisateur Page 14

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