Advanced Instruments GPR-2800 IS Manual
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Advanced Instruments, Inc16Gas ConnectionsThe GPR-2800 IS with its standard flow through configuration is designed for positive pressure samples andrequires connections for incoming sample and outgoing vent lines. Zero and span inlet ports are offered aspart of the optional sample systems. The user is responsible for calibration gases and other requiredcomponents, see below.Procedure:Caution: Do not change the factory setting until instructed to do in this manual.If analyzer has no marking for sample inlet and sample vent, designate one of the bulkhead tube fittings asthe VENT and the other as SAMPLE.Regulate the sample pressure as described in “Pressure and Flow” section above.Connect a 1/8” or a ¼” vent line to the compression fitting to be used for venting the sample.Connect a 1/8” or ¼” sample line to the compression fitting to be used to bring SAMPLE gas to the analyzer.If equipped with optional SPAN and/or ZERO ports, connect the SPAN and the ZERO gas lines to therespective SPAN and ZERO ports of the analyzerSet the SAMPLE, SPAN and the ZERO gas pressure between 5-30 psig..Select sample gas and allow it to flow through the transmitters and set the flow rate to1- 2 SCFH.Note: If equipped with the optional H2S sample conditioning system: Regulate the pressure so that it doesnot exceed 30 psig.Flow rates of 1-5 SCFH cause no appreciable change in the oxygen reading. However, flow rates above 5SCFH may generate a backpressure and cause erroneous oxygen readings due to fact that the smallerdiameter of the integral sample system tubing cannot vent the sample gas quickly at higher flow rates. If theanalyzer is not equipped with an integral flow control valve, a flow control metering valve with a flowindicator upstream of the sensor must be installed to control the flow rate of the sample gas. A flow rate of 1-2 SCFH or 0.5-1 liter per minute is recommended for optimum performance.Caution: Do not place your finger over the vent (it pressurizes the sensor) to test the flowindicator when gas is flowing to the sensor. Removing your finger (the restriction) generates asudden vacuum on the sensor and may lead to electrolyte leakage thus causing damage to thesensor (will void sensor warranty). |
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