Magnetic flowmeter

Details Magnetic flowmeter Magnetic flowmeter

1978-05-03

1979-05-29

Ruehl, Charles A.

Measuring and testing

Volume or rate of flow

System

G01F 158

Patent

active

041563638

ABSTRACT:
An excitation system for a magnetic flowmeter provided with a flow tube through which the fluid to be metered is conducted, the tube having a pair of electrodes mounted at diametrically-opposed positions thereon and including an excitation coil to establish a magnetic field in the tube which is normal to the tube's axis and to a transverse axis passing through the electrodes, the fluid intersecting the magnetic field to induce a flow rate signal in said electrodes, the system including a full-wave rectifier coupled to a commercial power line source which produces sinusoidal a-c power whose wave periodically crosses a zero line. A switch is interposed between the rectifier and said excitation coil. Also provided are means to effect on-off control of the switch by high-frequency pulses which are in synchronism with the commercial power line frequency but are not generated in the region in which said a-c power crosses the zero line, whereby the full-wave rectified output is periodically fed to the excitation coil except in the interval when the a-c power crosses the zero line.

REFERENCES:
patent: 3996797 (1976-12-01), Torimaru et al.
patent: 4059014 (1977-11-01), Torimaru

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