Level detector with multiple magnetically activated switches

Details Level detector with multiple magnetically activated switches Level detector with multiple magnetically activated switches

1987-07-10

1989-01-10

Yasich, Daniel M.

Measuring and testing

Liquid level or depth gauge

Float

73313, 200 84C, G01F 2362, H01H 3518

Patent

active

047964723

ABSTRACT:
The linear position transducer of the present invention comprises a pair of elongated electrically conducting members disposed within an elongated tubular container following the length thereof, wherein at least one of the pair of elongated electrically conducting members has a high specific ohmic resistance. A plurality of normally open switches are disposed within the elongated tubular container at regular intervals in a parallel circuit arrangement intermediate the pair of elongated electrically conducting members, which switches are closed by a magnetic force field created by a magnet included in a marker slidably guided by the elongated tubular container. The position of the marker is determined from the difference in the ohmic resistance between two electric circuits respectively including in series one portion of the pair of elongated electrically conducting members and the switch closed by the magnetic field of the marker and in series the other portion of the pair and the same switch closed by the magnetic field, wherein the closed switch divides the pair of elongated electrically conducting members into the one and and the other portions.

REFERENCES:
patent: 3678750 (1972-07-01), DiNoia et al.
patent: 4384184 (1983-05-01), Alvarez
patent: 4466284 (1984-08-01), Dumery
patent: 4730491 (1988-03-01), Lew

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