Electromagnetic flowmeter with triangular flux drive

Details Electromagnetic flowmeter with triangular flux drive Electromagnetic flowmeter with triangular flux drive

1986-07-11

1987-11-10

Ruehl, Charles A.

Measuring and testing

Volume or rate of flow

By measuring electrical or magnetic properties

G01F 160

Patent

active

047049073

ABSTRACT:
An electromagnetic flowmeter in which the fluid being metered passes through a flow tube to intersect the lines of flux of a magnetic field produced by an electromagnet whereby the resultant voltage induced in the fluid is transferred to a pair of electrodes mounted at diametrically-opposed positions on the tube. The electromagnet is so driven as to produce a flux field having a triangular wave form. The voltage signal yielded by the electrodes is therefore a composite having a triangular wave component that is a replica of the flux wave and a rectangular wave component that is generated by a spurious loop pick up voltage. The composite signal is applied to a converter and processed therein to cancel out the rectangular wave component whereby the converter output signal is accurately proportional to the flow rate of the fluid.

REFERENCES:
patent: 3802263 (1974-04-01), Krechmery et al.
patent: 3965738 (1976-06-01), Watanabe
patent: 4157035 (1979-06-01), Doll et al.
patent: 4227408 (1980-10-01), Schmoock et al.
patent: 4513624 (1985-04-01), McHale et al.

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