Ionization fire-signal device

Details Ionization fire-signal device Ionization fire-signal device

1978-11-17

1981-01-06

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

250381, 313 54, G08B 1710

Patent

active

042439817

ABSTRACT:
An ionization fire-signal device is provided which is compact in construction so that it has a small axial height. The housing for the device includes an axial extending outer wall and a transversely extending front wall to form a cup shaped housing. An insulator, including an axially extending circular wall which forms an enclosure, is positioned inside the housing and cooperates with the housing to form a measuring chamber. The axial dimension of the circular insulator wall and outer housing wall are approximately equal. In addition, a reference chamber is formed between the circular wall of the insulator and the outer wall of the housing such that the reference chamber is arranged transversely adjacent to the measuring chamber. A radiation source for ionizing the measuring chamber and reference chamber is also provided. An electrical alarm signal circuit is also disposed between the circular insulator wall and the outer housing wall and is electrically connected to two electrodes in the measuring chamber and two electrodes in the reference chamber.

REFERENCES:
patent: 3728706 (1973-04-01), Tipton et al.
patent: 3842409 (1974-10-01), Mayer
patent: 3934145 (1976-01-01), Dobrzanski et al.
patent: 4058803 (1977-11-01), Scheidweiler

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