Gas flow meter and method for measuring gas flow rate

Measuring and testing – Volume or rate of flow – Tank type

Reexamination Certificate

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Reexamination Certificate

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07082826

ABSTRACT:
A gas flow rate meter includes an upstream line and two chambers having substantially equal, fixed volumes. An adjustable valve may direct the gas flow through the upstream line to either of the two chambers. A pressure monitoring device may be configured to prompt valve adjustments, directing the gas flow to an alternate chamber each time a pre-set pressure in the upstream line is reached. A method of measuring the gas flow rate measures the time required for the pressure in the upstream line to reach the pre-set pressure. The volume of the chamber and upstream line are known and fixed, thus the time required for the increase in pressure may be used to determine the flow rate of the gas. Another method of measuring the gas flow rate uses two pressure measurements of a fixed volume, taken at different times, to determine the flow rate of the gas.

REFERENCES:
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patent: 5201581 (1993-04-01), Vander Heyden et al.
patent: 5551282 (1996-09-01), Vander Heyden
patent: 5684245 (1997-11-01), Hinkle
patent: 5925829 (1999-07-01), Laragione et al.
patent: 5975126 (1999-11-01), Bump et al.
patent: 6502467 (2003-01-01), Fincke
patent: 6564825 (2003-05-01), Lowery et al.
patent: 6725731 (2004-04-01), Wiklund et al.
patent: 6739204 (2004-05-01), Barefoot

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