Electromagnetic flow meter

Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties

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Details

7386113, G01F 158

Patent

active

055787630

ABSTRACT:
A flow meter comprises a conduit adapted to conduct a flow of a fluid, a stop in the conduit, and a body that is movably received in the conduit, is normally kept in engagement with the stop by the fluid flow, and has at least a portion of a magnetically responsive material. An electromagnet is located outside the conduit in a position upstream from the stop, relative to the direction of the fluid flow, and has its poles located such as to impose a magnetic force on the magnetically responsive material of the body when it is energized. A ramp current generator energizes the electromagnet so as to progressively increase the magnetic force that it produces until the magnetic force is sufficient to move the body against the fluid flow and attract the body to a position between the poles. A multi-turn sensor coil or a magnetic field sensor detects changes in the magnetic flux field of the electromagnet when the body moves away from the stop and toward the electromagnet and outputs a sensing signal, which in turn initiates the capture of a measurement of the current that resulted in attraction of the body away from the stop against the force of the fluid flow.

REFERENCES:
patent: 3605741 (1971-09-01), Spencer
patent: 3662598 (1972-05-01), Spencer
patent: 4003255 (1977-01-01), Spencer
patent: 4041756 (1977-08-01), Head et al.
patent: 4051723 (1977-10-01), Head et al.
patent: 4167115 (1979-09-01), Stoever
patent: 4507976 (1985-04-01), Banko
patent: 4944190 (1990-07-01), Scally et al.

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