Electromagnetic flowmeter

Details Electromagnetic flowmeter Electromagnetic flowmeter

1985-07-10

1987-05-12

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

By measuring electrical or magnetic properties

361154, G01F 160

Patent

active

046639764

ABSTRACT:
An electromagnetic flowmeter using an exciting current of a rectangular wave form supplied to an exciting coil for excitation, wherein a DC voltage produced by rectifying a frequency power source, is applied by way of a voltage regulating circuit to an exciting circuit, and a switching device is connected in series between the exciting circuit and the voltage regulating circuit and is controlled by a DC reference voltage determining the level of the exciting voltage and a timing signal determining the switching timing for the exciting current. The invention enables accurate and rapid control of the waveform of the exciting current, reduces costs, and can be used for different voltages without any substantial change of circuitry.

REFERENCES:
patent: 3996797 (1976-12-01), Torimaru et al.
patent: 4204240 (1980-05-01), Schmoock
patent: 4373400 (1983-02-01), Sekiguchi
patent: 4462060 (1984-07-01), Schmoock
patent: 4488438 (1984-12-01), Tomita
patent: 4563904 (1986-01-01), Geisler

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