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Title: Fundamental Principles Of Displacement Meters
Author: R.W. Nckee
Source: 1983 International School of Hydrocarbon Measurement
Year Published: 1983
Abstract: THE MAJORITY OF GAS VOLUME MEASURING DEVICES CURRENTLY IN USE UTILIZE THE POSITIVE DISPLACEMENT PRINCIPLE OF MEASUREMENT. IN POSITIVE DISPLACEMENT MEASUREMENT, AN ACCURATELY KNOWN WOLUME OF GAS IS ALTERNATELY TRAPPED AND RELEASED AND THE NUMBER OF TRAPPING CYCLES IS RECORDED ON A REGISTER CALIBRATED IN THE DESIRED MEASURING UNITS. TO ILLUSTRATE THE POSITIVE DISPLACEMENT PRINCIPLE, IMAGINE A PISTON AND CYLINDER WITH AN INLET AND OUTLET PORT. WITH THE INLET PORT OPENED, THE CHAMBER WILL FILL WITH GAS AND CLOSE AT THE END OF THE PISTON STROKE. AT THIS INSTANT, WE WOULD KNOW HOW MUCH GAS IN IN THE CHAMBER. THE OUTLET PORT THEN OPENS EXHAUSTING THE GAS. BY SIMPLY COUNTING THE NUMBER OF TIME THE CYLINDER FILLS AND EMPTYS, WE HAVE AN EFFECTIVE MEASUREMENT DEVICE.

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