Fail-safe magnetic sensing arrangement

Details Fail-safe magnetic sensing arrangement Fail-safe magnetic sensing arrangement

G - Physics

08

B

340/124.3

G08B 21/00 (2006.01) B61L 3/00 (2006.01) B61L 3/12 (2006.01)

Patent

CA 1168728

(Case No. 7120) ABSTRACT OF THE DISCLOSURE A fail-safe magnetic sensing arrangement including a first and a second object relatively movable in relationship to each other. The first object includes a magnetic structure having a permanent magnet and a pair of pole pieces to develop a magnetic field. The second object includes an a.c. oscillator which is coupled to an amplifier by a saturable reactor trans- former and the amplifier feeds a negative d.c. maker which normally energizes a relay except when the saturable reactor transformer is saturated by the magnetic structure which signi- fies that the second object is in the vicinity of the first object.

388399

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