Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties
Patent
1997-05-13
1999-02-02
Biegel, Ronald L.
Measuring and testing
Volume or rate of flow
By measuring electrical or magnetic properties
7386117, G01F 100
Patent
active
058668233
ABSTRACT:
A flowmeter for measuring the velocity of a fluid employs a circuit for producing a magnetic field transverse to the direction of fluid velocity, thereby inducing a voltage potential in the fluid. At least two electrodes, in electrical contact with the fluid and spaced apart along a line transverse to the direction of the magnetic field and transverse to the direction of the fluid velocity, are responsive to the induced voltage potential. A signal processing circuit, that is responsive to the two electrodes, generates a velocity signal representative of the magnitude of the velocity of the fluid. A circuit periodically grounds the two electrodes, thereby eliminating any residual charge that builds up on the electrodes.
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Instruments Society of America, "Effects of the Inner Wall Conductivity of Adjacent Connecting Pipes on the Signal of Magnetic Flowmeters" pp. 1181-1192.
Thomas J. Scarpa, ISA, "Flow Velocity Profiles".
Biegel Ronald L.
Hersey Measurement Company
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