Noise-reducing electrodes for electromagnetic flowmeter

Details Noise-reducing electrodes for electromagnetic flowmeter Noise-reducing electrodes for electromagnetic flowmeter

1980-05-22

1981-10-27

Ruehl, Charles A.

Measuring and testing

Volume or rate of flow

By measuring electrical or magnetic properties

7386117, G01F 158

Patent

active

042966361

ABSTRACT:
An electromagnetic flowmeter wherein a liquid to be metered is conducted through a flow tube to intersect a transverse magnetic field produced by an electromagnet, the resultant signal induced in the liquid being transferred to a pair of electrodes mounted at diametrically-opposed points on the tube. To avoid spurious signal components arising from stray couplings between the electromagnet and the loop constituted by the electrodes and the liquid bridging the electrodes, the coil of the electromagnet is energized by a low-frequency wave whose frequency is well below the standard a-c power line frequency. And, to avoid noise components produced when the liquid being metered is a slurry containing solid particles which impinge on the surface of the electrodes, the electrodes are fabricated of or coated by a carbide metal or an alloy thereof whose metallurgical hardness is such as to substantially reduce the generation of such noise components.

REFERENCES:
patent: 3314876 (1967-04-01), Ransley
patent: 3783687 (1974-01-01), Mannherz et al.

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