Presence detecting system with self-checking

Details Presence detecting system with self-checking Presence detecting system with self-checking

G - Physics

08

B

340/71

G08B 13/18 (2006.01) F16P 3/14 (2006.01) G01V 9/00 (2006.01) G08B 13/183 (2006.01)

Patent

CA 1036686

ABSTRACT This invention relates to presence sensing systems and more particularly to such systems which utilize beams of radiant energy, such as light beams, to detect the presence of a person or an object within a predetermined space. Addi- tionally the invention relates to presence detecting systems combined with self-checking means to ensure that the detection system is operating properly.

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