Xentaur XDT User Manual
Also see for XDT: User manual
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Contents
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XDT User’s Manual62.3.2 Extractive InstallationFor extractive installations we recommend our sample system ESS, which may be equipped witha variety of features, such as: isolation valve, coalescing or particulate filter, pressure regulator,calibration sample injection or extraction port, pressure gauge, flow meter, weatherproof enclo-sure. Refer to the ESS literature for more information.If the resources to make your own sample system are available, the following two diagrams maybe used as a guideline to configure a simple system.It is generally recommended to measure at ambient pressure for the following reasons:• The readings will not be affected by variations in line pressure.• The risk of exposing the sensor to liquid water is significantly reduced.• ppm readings are computed for a pressure of one atmosphere (1 bar); and have to be correctedusing software in the instrument, or a pressure monograph, or calculator if the sensor is mea-suring at different pressures.If readings at line pressure are necessary, it is recommended to measure at ambient pressure and touse the instrument’s pressure compensation feature to calculate the dewpoint at line pressure.Refer to Viewing Dewpoint Mode section 3.4.4.1.Please make sure that:• The sample is taken from the upper surface of the main gas line. This avoids problems withcontamination. The sample should be taken away from pipe line walls where flow rates maybe low, and dewpoint changes may lag.• For dewpoints dryer than -40°F, use stainless steel tubing only. For dewpoints -40°F and wet-ter, copper tubing is acceptable. Do not use plastic, rubber or tygon tubing under any circum-stances, as measurements would be incorrect and/or response time slow due to water retentionExhaustRegulator orNeedle ValveSafety shut-off ValveExtractive Installation, SensorMeasuring at Line PressureExhaustRegulator orNeedle ValveExtractive Installation, SensorMeasuring at Ambient PressureSample Cell Sample CellMainGas LineMainGas Line |
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