Measuring and testing – Volume or rate of flow – System
Patent
1974-12-10
1976-10-05
Ruehl, Charles A.
Measuring and testing
Volume or rate of flow
System
73181, G01F 158
Patent
active
RE0289892
ABSTRACT:
A body means of electrically non-conductive material supports at least one pair of electrically conductive detecting electrodes disposed at opposite portions of the body means. Means is supported within the body means between the electrodes for producing an alternating magnetic field. An electrical circuit is connected to the detecting electrodes and includes indicating means. In one form of the invention, electrically conductive guard means is disposed adjacent the electrodes and means is provided for establising a potential on the guard means which is directly proportional to the potential on the detecting electrodes. In another form of the invention, means is provided for driving the electromagnet to produce an alternating magnetic field at a predetermind frequency wherein the magnetic field is driven to a finite value for a predetermind time interval during each cycle, and the electrical circuit includes means for measuring the signal from the detecting electrodes during a time delayed portion of said time interval. In a further form of the invention, pairs of oppositely disposed detecting electrodes are provided at right angles to one another so as to indicate the direction of water current flow. In each form of the invention, shield means is preferably employed in the form of electrically conductive material disposed between the detecting electrodes and the means for producing the magnetic field.
REFERENCES:
patent: 2808723 (1957-10-01), Buntenbach
patent: 2969673 (1961-01-01), Snyder et al.
patent: 3110876 (1963-11-01), Ramey et al.
patent: 3114260 (1963-12-01), Soller et al.
patent: 3161047 (1964-12-01), Griswold
patent: 3329018 (1967-07-01), Hognestad
patent: 3503258 (1970-03-01), Baker
patent: 3550446 (1970-12-01), Tucker et al.
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