Magnetic flowmeter

Details Magnetic flowmeter Magnetic flowmeter

1976-01-22

1976-12-14

Gill, James J.

Measuring and testing

Volume or rate of flow

System

G01F 160

Patent

active

039967972

ABSTRACT:
A magnetic flowmeter wherein liquid to be metered is conducted through a flow tube to intersect a transverse magnetic field established by an electromagnet. The voltage induced in the fluid is transferred to a pair of electrodes mounted at diametrically-opposed positions on the flow tube. The electromagnet is energized by a low-frequency wave which is produced by applying the output of a full-wave rectifier to the excitation coils of the electromagnet through a switching element. The switching element acts to chop the full-wave rectified output in accordance with high-frequency pulses whose frequency is higher than that of a commercial electric power line, the duty cycle thereof being modulated by a low-frequency, sinusoidal wave whose frequency is less than that of the commercial line.

REFERENCES:
patent: 3783686 (1974-01-01), Hentschel
patent: 3955413 (1976-05-01), Steele et al.

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