Measuring and testing – Volume or rate of flow – Using differential pressure
Patent
1990-11-02
1992-05-26
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Using differential pressure
7386154, G01F 124
Patent
active
051156849
ABSTRACT:
The flowmeter includes a piston that is biased by a spring to a neutral position within an encircling collar, and the piston is movable relative to the collar by and in the direction of the fluid flow to be measured. Movement of the piston relative to the collar increases the fluid flow through through one or more slots provided in one of such components. A Hall device senses movement of a magnet connected to the piston, and produces an output signal. A linear relationship between the output signal and the rate of flow of the fluid can be achieved by utilization of a magnetic member whose magnetic intensity or cross-sectional shape varies along its length, or by causing the magnet to move along a curve or other path of travel that varies its distance from the probe of the Hall device.
REFERENCES:
patent: 2069309 (1937-02-01), Henszey
patent: 3112646 (1963-12-01), English
patent: 3415119 (1968-12-01), Moore
patent: 4194394 (1980-03-01), Bartholomaus
patent: 4205592 (1980-06-01), Haussler
patent: 4235105 (1980-11-01), Walters
patent: 4304136 (1981-12-01), McCabe et al.
patent: 4315436 (1982-02-01), McCabe et al.
patent: 4381699 (1983-05-01), Haussler
patent: 4475407 (1984-10-01), Kruncos
Barmag AG
Goldstein Herbert
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