FLOW CALIBRATOR
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United States of America Patent
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Issued Date -
Feb 19, 2009
app pub date -
Aug 8, 2008
filing date -
Aug 17, 2007
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A piston-and-cylinder gas flow calibrator (prover) having piston and cylinder elements with interface surfaces made of glass, quartz, or alumina. The piston and cylinder are made of the same material so as to have the same coefficient of thermal expansion. In one embodiment, the surface of the piston is ground, while the facing surface of the cylinder is unground. Also, disclosed are movement detectors for detecting movement of the piston in the cylinder.
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