Analytical Industries GPR-1100 ATEX Portable Trace PPM Oxygen Analyzer - Manual (Page 24)

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8. Caution: If the analyzer 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.
9. Assure the sample is adequately vented for optimum response and recovery – and safety.
10. 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.
Battery Considerations
Charging the battery requires a common 9VDC adapter (positive pole located inside the female connector) supplied
with the analyzer and a convenience outlet. The analyzer’s charging circuit accepts 9VDC from any standard AC
110V or 220V adapter. The electronic design enables the analyzer to remain fully operable during the 8-10 hour
charging cycle.
Procedure:
1. Unless the analyzer is to be operated while charging, turn the analyzer OFF when charging the battery for the
shortest charging cycle.
2. Connect the appropriate 9VDC adapter supplied with the analyzer to an 110V or 220V outlet.
3. Insert the male phone plug from the 9VDC adapter into the integral female CHARGE jack located on the
bottom of the enclosure.
4. Caution: The analyzer is designed to operate in the charging mode, however, operating the analyzer in
hazardous or explosive atmospheres while charging the battery IS NOT recommended despite the instrinsically
safe design.
Service: A single charge is sufficient to operate the GPR-1100 Series analyzer continuously for a period of 60 days.
Warning indicators:
1. An LED indicator located on the front panel will light continuously during the CHARGE cycle.
2. A second LED indicator located on the front panel provides a blinking 72 hour warning LOW BATT of the need
to recharge the battery. Caution: Operating the analyzer beyond this 72 hour warning may permanently
damage the battery.