Analytical Industries GPR-2500 A Oxygen Analyzer - Manual (Page 30)

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5. For sample gases under positive pressure the user must provide a means of controlling the inlet pressure
between 5-30 psig and the flow of the sample gas between 1-5 SCFH, a flow rate of 2 SCHF is recommended
6. For sample gases under atmospheric or slightly negative pressure an optional sampling pump is recommended
to draw the sample into the transmitter. Generally, no pressure regulation or flow control device is involved.
7. Caution: If the transmitter is equipped with an optional sampling pump and is intended for use in both
positive and atmospheric/slightly negative pressure applications where a flow meter valve is involved – ensure
the valve is completely open when operating the sampling pump. Refer to the Pressure & Flow section above.
8. Assure the sample is adequately vented for optimum response and recovery – and safety.
9. Allow the oxygen reading to stabilize for approximately 10 minutes at each sample point.
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 transmitter 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
¾ The transmitter has no special storage requirements.
¾ The sensor should remain connected during storage periods.
¾ Store the transmitter with the power OFF.
¾ If storing for an extended period of time, charge before operating.