Electromagnetic flowmeter with noise compensation

Details Electromagnetic flowmeter with noise compensation Electromagnetic flowmeter with noise compensation

1978-09-12

1980-01-01

Myracle, Jerry W.

Measuring and testing

Volume or rate of flow

System

G01F 160

Patent

active

041810198

ABSTRACT:
An electromagnetic flowmeter in which a low-frequency rectangular wave is supplied to the electromagnet coil of the flowmeter to produce an excitation current establishing a magnetic field which is intercepted by the fluid passing through the flow tube to induce a signal voltage in the electrodes disposed in the tube. This signal voltage is proportional to flow rate and is accompanied by an objectionable D-C noise component. To eliminate this noise component, the signal voltage is passed through a first high-pass filter, and to compensate for errors introduced by this filter, the signal voltage derived from the first filter is divided by a comparison voltage derived from the excitation current, but only after this comparison voltage passes through a second high-pass filter having essentially the same characteristics as the first filter.

REFERENCES:
patent: 3902366 (1975-09-01), Gruner
patent: 4059014 (1977-11-01), Torimara

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