Analytical Industries GPR-1200 MS ATEX Portable PPB Oxygen Analyzer - Manual (Page 23)

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7. For sample gases under positive pressure the user must provide a means of regulating 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.
8. 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.
9. Caution: If the analyzer is equipped with both a FLOW valve and an integral SAMPLING PUMP, always open
the FLOW valve completely before operating the pump (avoid drawing a vacuum on the sensor).
10. Assure the sample is adequately vented for optimum response and recovery – and safety.
Caution: To avoid damaging the sensor comply with the following guidelines - failure to do so will
possibly damage the sensor and/or voiding the sensor warranty.
1. Drawing a vacuum on the sensor by pressurizing the analyzer: Results when sample gas flows into the analyzer,
builds up within the analyzer sample system because the outlet vent is restricted, and, is suddenly released when
the blockage is removed. This sudden release of backpressure draws a vacuum on the sensor stressing the sensor’s
front and rear seals to the point they rupture and the sensor leaks (voiding the sensor warranty).
2. Drawing a vacuum on the sensor when using a sampling pump downstream of the analyzer: Assure the FLOW
valve is completely open. If the FLOW valve is not completely open, the resulting vacuum drawn on the analyzer
may exceed the recommended limit and damage the sensor by stressing the sensor’s front and rear seals to the
point they rupture and the sensor leaks (voiding the sensor warranty).
3. Subjecting the analyzer to high positive pressure can damage to the pumps or other flow system components.
4. Introducing calibration span gas from a pressurized cylinder without pressure regulation: Adversely affects the
accuracy of the calibration. Follow above recommendations.
5. NEVER block the outlet vent of the sample gas on the side of the analyzer: This includes pressing your finger
over the outlet vent to confirm the flow indicator is operating.
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-1200MS analyzer continuously for a period of 60 days, 1
day when operating the optional integral sampling pumps continuously.
Warning indicators: