Electromagnetic flowmeter system

Details Electromagnetic flowmeter system Electromagnetic flowmeter system

1980-01-15

1981-09-22

Ruehl, Charles A.

Measuring and testing

Volume or rate of flow

By measuring electrical or magnetic properties

G01F 160

Patent

active

042903130

ABSTRACT:
An electromagnetic flowmeter system whose electromagnets are excited by a direct-current source through switching means operating at a predetermined drive frequency to generate a pulsatory current establishing a magnetic flux field in the flow tube through which the fluid to be measured is conducted. The fluid intercepting this field induces a pulsatory voltage in the metering electrodes mounted at diametrically-opposed positions on the tube. The electrode voltage is applied to an analyzer which includes a sampling switch operating in synchronism with the drive frequency to extract pulses from the electrode voltage during the magnetic flux steady state intervals thereof. These pulses, which are rich in harmonics, are fed through a filter that selects one of the harmonics to yield a harmonic signal which is demodulated to produce an output signal free of disturbances.

REFERENCES:
patent: 3550446 (1970-12-01), Tucker et al.
patent: 3759097 (1973-09-01), Cushing
patent: 3999443 (1976-12-01), Appel et al.
patent: 4050301 (1977-09-01), Cushing

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