Measuring and testing – Volume or rate of flow – System
Patent
1976-07-30
1977-07-19
Ruehl, Charles A.
Measuring and testing
Volume or rate of flow
System
G01F 158
Patent
active
040360520
ABSTRACT:
An electromagnetic flowmeter having a flow tube interposed in a normally less-than-full fluid line. A pair of arcuate electrodes are mounted in the flow tube at opposed positions spanning a substantial portion of the total circumference of the inner wall of the tube, whereby the electrodes are operative with respect to fluid in the tube in a range extending from a level close to empty to completely full. The electrodes which are in direct contact with the fluid have an inverted T formation, whose vertical leg conforms to the inner circumference of the tube, and whose horizontal base extends along the bottom of the tube, thereby maintaining a large portion of the electrode area in contact with the fluid at all times. 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.
REFERENCES:
patent: 3479871 (1969-11-01), Cushing
patent: 3757576 (1973-09-01), Rolff et al.
patent: 3783687 (1974-01-01), Mannherz et al.
Fischer & Porter Co.
Ruehl Charles A.
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