Smoke simulating test apparatus for smoke detectors

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

1978-02-01

1980-03-18

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

With particular system function

313 54, 250381, 340629, G08B 2900, G08B 1710

Patent

active

041941918

ABSTRACT:
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 predetermined level of airborne products of combustion within the measuring chamber.

REFERENCES:
patent: 4081684 (1978-03-01), Wieder

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