Communications: electrical – Condition responsive indicating system – With particular system function
Patent
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
Caldwell Sr. John W.
General Electric Company
Myer Daniel
Nieves Carlos
Platt Leonard J.
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