Excitation system for electromagnetic flowmeter

Details Excitation system for electromagnetic flowmeter Excitation system for electromagnetic flowmeter

1978-08-21

1980-03-18

Ruehl, Charles A.

Measuring and testing

Volume or rate of flow

System

G01F 160

Patent

active

041932986

ABSTRACT:
A technique for exciting the electromagnet of a magnetic flowmeter in which a fluid to be metered is conducted through a flow tube having detecting electrodes, the fluid intercepting a magnetic field established by the electromagnet to induce a signal in the electrodes indicative of flow in a high flow-rate range as well as in a low flow-rate range. In this technique, derived from the electrode signal is a control signal whose frequency is a function of the velocity of the fluid passing through the tube, the excitation current supplied to the electromagnet being governed by the control signal so that it has a frequency which is higher in the high flow-rate range and lower in the low flow-rate range.

REFERENCES:
patent: 4089219 (1978-05-01), Suzuki

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