Analytical-industries GPR-1100 ATEX Portable Trace PPM Oxygen Analyzer Manuel d'utilisateur télécharger pdf (Page 9)

Application Pressure - Atmospheric or Slightly Negative:

For accurate ppm range oxygen measurements, an optional external sampling pump should be positioned

downstream of the sensor to draw the sample from the process, by the sensor and out to atmosphere. A flow

meter is generally not necessary to obtain the recommended flow rate with most sampling pumps, if the analyzer is

equipped with a flow meter make sure the valve is completely open to avoid drawing a vacuum on the sensor.

Caution: If the analyzer is equipped with an optional flow indicator with integral metering valve (GPR-1100M)

upstream of the sensor - open the metering valve completely to avoid drawing a vacuum on the sensor and placing

an undue burden on the pump.

If pump loading is a consideration, a second throttle valve on the pump’s inlet side may be necessary to provide a

bypass path so the sample flow rate is within the above parameters.

To avoid erroneous oxygen readings and damaging the sensor:

¾ 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).

¾ Assure there are no restrictions in the sample or vent lines

¾ Avoid drawing a vacuum that exceeds 14” of water column pressure – unless done gradually

¾ Avoid excessive flow rates above 5 SCFH which generate backpressure on the sensor.

¾ Avoid sudden releases of backpressure that can severely damage the sensor.

¾ Avoid the collection of particulates, liquids or condensation collect on the sensor that could block the diffusion

of oxygen into the sensor.

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Analytical-industries GPR-1100 ATEX Portable Trace PPM Oxygen Analyzer Manuel d'utilisateur Page 9