Electromagnetic flowmeter usable in less-than full fluid lines

Details Electromagnetic flowmeter usable in less-than full fluid lines Electromagnetic flowmeter usable in less-than full fluid lines

1975-10-14

1976-11-16

Ruehl, Charles A.

Measuring and testing

Volume or rate of flow

System

G01F 158

Patent

active

039916120

ABSTRACT:
An electromagnetic flowmeter having a flow tube which is interposable in a normally less-than-full fluid line. A pair of arcuate electrodes are mounted in the flow tube at opposed positions therein to span a substantial portion of the total tube circumference, whereby they are operative with respect to fluid in the tube in a range extending from a level close to empty to a level close to full. Associated with the flow tube is an electromagnet that is excited by a periodically-interrupted direct current to establish a magnetic field in the tube which is intercepted by the fluid passing therethrough to induce a signal in the electrodes. This signal is sampled during the steady state intervals of the magnetic flux to provide an output free of zero-shift error and of interference voltages. The flux distribution is such as to progressively decrease in intensity as one goes from the top to the bottom of the tube to provide an output signal which is indicative of flow rate and is independent of the liquid level so that an accurate reading of flow rate is obtained regardless of the level of fluid in the flow tube.

REFERENCES:
patent: 3329020 (1967-07-01), Cushing
patent: 3589186 (1971-06-01), Bourg et al.
patent: 3757576 (1973-09-01), Rolff et al.
patent: 3783687 (1974-01-01), Mannherz et al.

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