Gas or low volume liquid flow meter

Measuring and testing – Volume or rate of flow – Using differential pressure

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7386157, G01F 124

Patent

active

046304851

ABSTRACT:
An apparatus permitting non-invasive electrical monitoring of the volume of flow of a fluid at relatively low pressures and flow rates. The apparatus comprises an analog flow gage having a housing with an inner flow chamber of upwardly increasing cross sectional area and a ball indicator received in the chamber. The flow chamber is in the shape of a cylinder with a plurality of longitudinal slits extending outwardly from the cylinder and equally radially spaced apart. Each of the slits has a wedge shaped tapered portion which accounts for the increasing cross sectional area of the chamber. The flow rate inside the chamber is directly linearly related to the amount of upward displacement of the ball indicator along the length of the tapered portions. The apparatus also includes associated electrical circuitry for providing infinite step position detection of the ball indicator, converting the analog position information into a digital output and displaying a digital readout of the accumulative volume of flow, scaled in cubic feet.

REFERENCES:
patent: 2091792 (1937-08-01), Niesemann
patent: 2404361 (1946-07-01), Brewer
patent: 3308303 (1967-03-01), Weichselbaum et al.
patent: 3582662 (1971-06-01), Soiita
patent: 4257279 (1981-03-01), Marx
patent: 4315436 (1982-02-01), McCabe
patent: 4335618 (1982-06-01), Bocsky et al.
patent: 4486744 (1984-12-01), Pratt et al.

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