Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties
Patent
1995-12-28
1999-04-20
Chilcot, Richard
Measuring and testing
Volume or rate of flow
By measuring electrical or magnetic properties
G01F 158
Patent
active
058958649
ABSTRACT:
A magnetic flowmeter has a tube for supporting fluid flow and a circuit for indicating when the tube is empty. The circuit includes an amplifier connected to two electrodes in the tube and a variable resistor. The amplifier produces an oscillating signal when the tube is empty.
The circuit is calibrated for a particular fluid by finding a range of resistances for the variable resistor at which the circuit provides an accurate indication that the tube is empty, and storing information in the processor indicating a resistance in the range for the fluid.
REFERENCES:
patent: 3991612 (1976-11-01), Mannherz et al.
patent: 4036052 (1977-07-01), Searle
patent: 4503711 (1985-03-01), Bohn
patent: 5301556 (1994-04-01), Nissen et al.
patent: 5327787 (1994-07-01), Kiene et al.
patent: 5375475 (1994-12-01), Kiene et al.
patent: 5426984 (1995-06-01), Rovner et al.
Fischer & Porter Company, Magnetic Flowmeters 50XM1000B, Publication 24296, Figure 3-18, Schematic Analog Board, Jan. 1990.
Devore Vincent W.
Fonteneau Norman O.
Lewis Peter B.
Wang Shiquan
Artis Jewel
Chilcot Richard
The Foxboro Company
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