Proximity detection system and oscillator, and method of using s

Details Proximity detection system and oscillator, and method of using s Proximity detection system and oscillator, and method of using s

1993-12-14

1995-10-31

Swarthout, Brent

Communications: electrical

Condition responsive indicating system

Specific condition

340612, 73302, 73304C, 324660, 324674, 331 64, G08B 2100

Patent

active

054633788

ABSTRACT:
A proximity detection system includes a dual mode oscillator for generating a pair of ON and OFF control signals. A sensing circuit including a capacitance device detects the presence of a conductive object, such as a liquid, to cause the oscillator to switch its modes of oscillation.

REFERENCES:
patent: 3646541 (1972-02-01), Rathbun
patent: 4347740 (1982-09-01), Townsend
patent: 4530372 (1987-07-01), Overton et al.
patent: 5287086 (1994-02-01), Gibb

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