Electromagnetic flowmeter of the residual magnetism type

Details Electromagnetic flowmeter of the residual magnetism type Electromagnetic flowmeter of the residual magnetism type

1985-04-12

1986-07-22

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

By measuring electrical or magnetic properties

G01F 160

Patent

active

046012095

ABSTRACT:
An electromagnetic flowmeter has identical exciting coils coupled to portions which exhibit residual magnetism. A control circuit delivers short durations of current to each coil such that the current polarity in each coil determines the polarity of the magnetic flux across the conduit due to each residual magnetic portion. Four states of magnetic flux are repeatedly produced, zero, of one polarity, zero and of the other polarity. Flow note is determined by the difference between sampled voltages in a zero state and a directly succeeding state to eliminate noise components.

REFERENCES:
patent: 4210022 (1980-07-01), Boss
patent: 4409846 (1983-10-01), Ueno
patent: 4412545 (1983-11-01), Okine et al.

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