Smoke simulating test apparatus for smoke detectors

Details Smoke simulating test apparatus for smoke detectors Smoke simulating test apparatus for smoke detectors

G - Physics

01

N

358/21

G01N 27/70 (2006.01) G08B 17/10 (2006.01) G08B 17/12 (2006.01)

Patent

CA 1061017

ABSTRACT OF THE DISCLOSURE A smoke detector of the ionization type is provided with a movable test target or probe for intercepting alpha radiation within the measuring chamber when moved to a particular position. As a result of the interception of alpha particles, the electrical resistance of the chamber between a pair of electrodes is increased. Since the electrical resistance similarly increases when airborne products of combustion enter the measuring chamber, the operative position and size of the test target may be selected such that its movement to its operative position results in electrical simulation of a pre- determined level of airborne products of combustion within the measuring chamber.

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