G - Physics – 08 – B
Patent
G - Physics
08
B
340/77, 340/140.
G08B 17/10 (2006.01) G01N 21/01 (2006.01) G08B 17/107 (2006.01) G08B 29/00 (2006.01) G08B 29/14 (2006.01)
Patent
CA 1045692
ABSTRACT OF THE DISCLOSURE Smoke detection apparatus including a pair of photo- electric cells which receive illumination in a predetermined ratio from a very low level light source. An improved simulating device is included for the purpose of testing the correct functioning of the alarm system connected to a sensing circuit formed by the photocells. The effects normally produced by smoke present in a chamber are simulated by selectively directing light from an auxil- iary light source onto the sensing or "reflected" cell in the sensing circuit. In addition, a specially designed and constructed sensor head is provided fro avoiding discrepancies in the placement of the critical elements; moreover, improved flow of any smoke present is promoted by the specific geometry of the sensor head. Also, discrepancies between the desired and actual ration of illum- ination received by the respective photocells can be readily ad- justed for electrically, and the light ratio between photocells can be changed by suitably adjusting the degree of illumination received by the direct cell.
268054
Costa Hilario S.
Lee Sung C.
Podany Vaclav O.
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