Measuring and testing – Volume or rate of flow – Using differential pressure
Patent
1984-05-09
1985-07-16
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Using differential pressure
G01F 124
Patent
active
045288585
ABSTRACT:
An improved flow meter has a vertical chamber of relatively constant cross-section. In this chamber a float resides having a corss-section only slightly less than the cross-section of the chamber. Fluid is introduced at the bottom of the chamber and flows to the top of the chamber. The chamber top is provided with relief port outletting through a chamber throttle value. Similarly, a passage through the float has a float throttle valve. The chamber throttle valve controls the back pressure on the float and provides adjustability to the lifting of the float at various pressure levels. The throttle valve provides adjustability to the range of flow to which positioning of the float responds. A series of apertures configured along the sides of the chamber open as the float moves upwardly in response to increasing fluid pressure in the chamber below the float. The flow meter is digitally sensitive on an analog basis to changes in flow. One of the chamber walls can be formed from a printed circuit board which includes apparatus for sensing the position of the float as well as the flow meter apertures. Calibration of the float sensors to float position is obviated by this arrangement.
REFERENCES:
patent: 1238498 (1917-08-01), Dawley
patent: 1947923 (1934-02-01), Schweitzer
patent: 4235105 (1980-11-01), Walters
patent: 4300402 (1981-11-01), Dimeff
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