Measuring and testing – Volume or rate of flow – System
Patent
1976-07-06
1978-03-21
Ruehl, Charles A.
Measuring and testing
Volume or rate of flow
System
73181, G01F 158
Patent
active
040796264
ABSTRACT:
An electromagnetic flow meter construction for substantially flush mounting within a surface past which a fluid is to flow. A pair of spaced electrodes in contact with the fluid are mounted along a line perpendicular to the fluid flow and an elongated electromagnet provides magnetic lines of force substantially perpendicular to both the fluid flow and the line of the electrodes to generate an electrical potential between the electrodes proportional to the fluid velocity.
The electrode leads are oriented with respect to the electromagnet to minimize the quadrature voltage and the electromagnet is bifilar wound and utilized in a push-pull alternating current driving circuit. The electrode signals are applied to a synchronous detector to generate a direct current voltage proportional to the fluid velocity.
REFERENCES:
patent: 3308659 (1967-03-01), Herndon
patent: 3400582 (1968-09-01), Warner
patent: 3487826 (1970-01-01), Barefoot
patent: 3620079 (1971-11-01), Nosley
patent: 3800592 (1974-04-01), Jones, Jr.
patent: 3805768 (1974-04-01), Barefoot et al.
patent: 3855858 (1974-12-01), Cushing
patent: 3965738 (1976-06-01), Watanabe
J. Lubcke, "Inductive Flow Measurement by Flat Measuring Probes", Automatisierungspraxis, vol. 12, No. 8, pp. 187-190, August 1975.
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