Analytical Industries GPR-2500 S Oxygen Analyzer - Manual (Page 28)

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20.9
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MANUAL SAMPLING
25% RANGE
24.5 C 100 KPA
If the calibration is unsuccessful, return to the SAMPLING mode with span gas flowing through the monitor, make
sure the reading stabilizes and repeat the calibration before concluding the equipment is defective.
If the calibration is successful, remove the flow through adapter to expose the sensor to the ambient air.
Wait 5 minutes to ensure the reading is stable and proceed to sampling.
Sampling
Following calibration the monitor returns to the SAMPLE mode after 30 seconds as illustrated above.
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.
¾ If the monitor is equipped with an optional integral sampling pump (positioned downstream of the sensor) and
a flow control metering valve (positioned upstream of the sensor), completely open the flow control metering
valve to avoid drawing a vacuum on the sensor and placing an undue burden on the pump.
Standby
The monitor has no special storage requirements.
The sensor should remain connected during storage periods.
Store the monitor with the power OFF.
If storing for an extended period of time, charge before operating.