Method and apparatus for measuring gas flow

Details Method and apparatus for measuring gas flow Method and apparatus for measuring gas flow

1983-03-24

1984-10-30

Goldstein, Herbert

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

7386154, 138 31, G01F 122, G01F 2500

Patent

active

044793774

ABSTRACT:
A movable piston is arranged within an open-ended cylinder, the piston having a peripheral groove for receiving liquid mercury to create a sliding gas-tight seal between the piston and the cylinder. The cylinder wall is provided with a plurality of openings, arranged to prevent mercury from escaping through said openings while permitting gas introduced into the interior of the cylinder to escape therefrom. When the piston reaches an equilibrium condition, the height of the piston represents the gas flow rate, which is determined by the flow rates through the total number of openings beneath the sliding seal. As an alternative embodiment, the flow rate is controlled by a downwardly moving piston. As another alternative embodiment, the piston is free to move up or down to compensate for fluctuations in pressure and/or flow rate within the cylinder.

REFERENCES:
patent: 710889 (1902-10-01), Prescott
patent: 1238498 (1915-02-01), Dawley
patent: 3125879 (1964-03-01), Porter, Jr.
patent: 4307601 (1981-12-01), Jackson
patent: 4403629 (1983-09-01), Vries

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