Analytical Industries GPR-1200 ATEX Portable Trace PPM Oxygen Analyzer - Manual (Page 26)

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and, the NPT end is taped and securely tightened into the mating male quick disconnect fittings which mate with the
female fittings on the analyzer
5. Assure there are no restrictions in the sample gas lines – inlet or vent.
6. For sample gases under positive pressure the user must provide a means of regulating the inlet pressure between 5-30
psig, the analyzer is equipped with a FLOW VALVE to set the flow rate at the recommended 2 SCHF.
7. 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. Caution: If the analyzer is
equipped with both a FLOW VALVE upstream of the sensor and an integral SAMPLING PUMP downstream of the sensor,
always open the FLOW VALVE completely before operating the pump (avoid drawing a vacuum on the sensor).
8. Assure the sample is adequately vented for optimum response and recovery – and safety.
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 If the analyzer is equipped with an optional integral sampling pump (positioned downstream of the sensor), completely
open the flow control metering valve (positioned upstream of the sensor) to avoid drawing a vacuum on the sensor and
placing an undue burden on the pump.
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.
Standby
The analyzer has no special storage requirements.
1. The sensor should remain connected during storage periods.
2. Store the analyzer with the power OFF.
3. If storing for an extended period of time, charge before operating.
6 Maintenance
With exception of components related to optional equipment and charging the battery of portable analyzers, cleaning the
electrical contacts when replacing the sensor is the extent of the maintenance requirements of this analyzer as there are no
serviceable parts in the analyzer given the nature of the solid state electronics and sensor.
Serviceability: Except for replacing the oxygen sensor, there are no parts inside the analyzer for the operator to service. Only
trained personnel with the authorization of their supervisor should conduct maintenance.
Sensor Replacement
Periodically, the oxygen sensor will require replacement. The operating life is determined by a number of factors that are
influenced by the user and therefore difficult to predict. The Features & Specifications define the normal operating conditions
and expected life of the standard sensor utilized by the GPR-1200 Series analyzer. Expected sensor life is inversely proportional
to changes in oxygen concentration, pressure and temperature.