Dynamic error correcting positive displacement piston flowmeter and method of measuring gas flow in a piston flowmeter
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United States of America Patent
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Jul 20, 2004
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N/A
app pub date -
Jan 22, 2003
filing date -
Jan 22, 2003
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Abstract
A positive displacement flowmeter comprising a cylindrical enclosure and a piston movable within the enclosure between the opposite ends of the enclosure; with the piston having a diameter closely approximating the diameter of the enclosure to form a clearance seal; means for permitting a gas, the flow of which is to be measured, into one end of the enclosure for moving said piston toward the opposite end of the enclosure, means for detecting the movement of the piston between two locations along the cylindrical enclosure, means for measuring the pressure in the cylindrical enclosure and for calculating the presence of a dynamic error, if any, during said timed interval in accordance with the following equation: ##EQU1## Where P.sub.2 and P.sub.1 are the absolute pressures at the end and at the start of the timed interval, V.sub.m is the volume displaced during the timed interval and V.sub.d is the dead volume for the enclosure (the total contained volume between the flow source and the measured portion of the cylinder) and calculating the gas flow during the timed interval taking into account said dynamic error.
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