Capacitance-type electrode assemblies for electromagnetic flowme

Details Capacitance-type electrode assemblies for electromagnetic flowme Capacitance-type electrode assemblies for electromagnetic flowme

1985-08-05

1986-12-30

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

By measuring electrical or magnetic properties

G01F 158

Patent

active

046319697

ABSTRACT:
An electromagnetic flowmeter for metering the flow rates of fluids of low conductivity, the flowmeter including a non-magnetic spool within which is disposed a pair of electrode assemblies at diametrically-opposed positions embedded with an insulating layer molded against the inner surface of the spool. Each assembly is constituted by a curved measuring electrode plate and a curved shielding electrode plate concentric with the spool, the face of the measuring electrode plate being exposed. Received within the insulating layer and covering the faces of the measuring electrode plates is a tubular liner made of dielectric material whose properties are appropriate to the fluid being metered, the liner defining a flow conduit for the fluid. In operation, each measuring electrode forms one plate of a capacitor whose dielectric is the liner and whose other plate is the fluid being metered, the electrodes acting as a capacitance-sensor to detect the voltage induced in the fluid when it intercepts a magnetic field whose lines of flux are normal to the flow direction.

REFERENCES:
patent: 3824856 (1974-07-01), Yard
patent: 3839912 (1974-10-01), Schmoock et al.
patent: 3981190 (1976-09-01), Vidmantas
patent: 4019386 (1977-04-01), Appel et al.
patent: 4098118 (1978-07-01), Schmoock
patent: 4420982 (1983-12-01), Schmoock
patent: 4434666 (1984-03-01), Hemp
patent: 4513624 (1985-04-01), McHale et al.

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