Analytical-industries GPR-28 Oxygen Analyzer Manuel d'utilisateur télécharger pdf (Page 28)

Advanced Instruments Inc.

Application Pressure - Atmospheric or Slightly Negative:

For accurate ppm range oxygen measurements, an optional integral sampling pump is positioned downstream of the sensor to

draw the sample from the process, by the sensor and out to atmosphere.

Caution: If the analyzer is equipped with an optional integral sampling pump (positioned downstream of the sensor),

completely open the FLOW valve (positioned upstream of the sensor) to avoid drawing a vacuum on the sensor and placing an

undue burden on the pump.

Review the Sample System discussion found in the Principle of Operation section at the beginning of section 5.

Procedure:

1. Select the desired sampling range that provides maximum resolution.

2. Use metal tubing to transport the sample gas to the analyzer. The main consideration is to eliminate air leaks which can

affect oxygen measurements.

3. Ensure the upper and bottom sections of the sensor housing are secured tightly by the U-shaped clamp and bolt in the

center of the bottom section of the sensor housing.

4. Ensure the sample gas tube fittings are properly installed with both ferrules, finger tightened and ¾ of a turn for 1/8”

tubing and 1-1/4 of a turn for ¼” tubing.

5. Assure there are no restrictions in the sample gas lines – inlet or vent.

6. For sample gases under positive pressure the user must provide a means of regulating the inlet pressure between 5-30

psig, the analyzer is equipped with a FLOW VALVE to set the flow rate at the recommended 2 SCHF.

7. For sample gases under atmospheric or slightly negative pressure an optional sampling pump is recommended to draw the

sample into the analyzer. Generally, no pressure regulation or flow control device is involved.

8. Caution: If the analyzer is equipped with both a FLOW valve upstream of the sensor and an integral SAMPLING PUMP

downstream of the sensor, always open the FLOW valve completely before operating the pump (avoid drawing a vacuum

on the sensor).

9. Assure the sample is adequately vented for optimum response and recovery – and safety.

To avoid erroneous oxygen readings and damaging the sensor:

1. Do not place your finger over the vent (it pressurizes the sensor) to test the flow indicator when gas is flowing to the

sensor. Removing your finger (the restriction) generates a vacuum on the sensor and may damage the sensor (voiding the

sensor warranty).

2. If the analyzer is equipped with an optional integral sampling pump (positioned downstream of the sensor), completely

open the flow control metering valve (positioned upstream of the sensor) to avoid drawing a vacuum on the sensor and

placing an undue burden on the pump.

3. Assure there are no restrictions in the sample or vent lines

4. Avoid drawing a vacuum that exceeds 14” of water column pressure – unless done gradually

5. Avoid changes in flow rate and excessive flow rates which generate backpressure on the sensor.

6. Avoid sudden releases of backpressure that can severely damage the sensor.

7. Avoid the collection of particulates, liquids or condensation collect on the sensor that could block the diffusion of oxygen

into the sensor.

Standby

The analyzer has no special storage requirements.

¾ The sensor should remain connected during storage periods – place the SAMPLE/BYPASS valve in the BYPASS position and

close the SHUT OFF completely.

¾ Store the analyzer with the power OFF.

¾ If storing for an extended period of time, charge before operating.

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Analytical-industries GPR-28 Oxygen Analyzer Manuel d'utilisateur Page 28

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