Multi-pole activation magnetic rotary sensing device

Details Multi-pole activation magnetic rotary sensing device Multi-pole activation magnetic rotary sensing device

H - Electricity

01

H

H01H 36/02 (2006.01) G01D 5/251 (2006.01) G01F 15/06 (2006.01) G01R 11/16 (2006.01)

Patent

CA 2313958

A metering device has a magnet with ten poles which is driven to rotate by a gear connected to a source of rotation that is proportional to fluid flow, the passage of time, or other phenomenon. A reed switch is mounted so that rotation of the poles of the magnet, into and out of a position adjacent to the reed switch causes the reed switch to open and close as the magnet rotates. The opening and closing of the reed switch causes a step change in voltage applied to an electronic device which increments a counter. A second reed switch spaced from the rotating magnet sufficiently so that it remains normally open can act as a sensitive device for detecting the presence of extraneous magnetic fields that might interfere with the operation of the first reed switch.

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