Double chamber ionization smoke detector

Details Double chamber ionization smoke detector Double chamber ionization smoke detector

1976-12-27

1979-05-08

Borchelt, Archie R.

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

250385, 250493, G01T 118, G01N 2312

Patent

active

041538404

ABSTRACT:
A combustion product detector comprises two ionization chambers with a radioactive source in each chamber. One chamber is vented to the ambient atmosphere and the other serves as a reference. A communicating passage is provided between the chambers. An adjustable target is provided in the reference chamber.
Test means to determine status of the device comprises a member having a conductive end which is normally in conductive relation with the vented electrode of the chamber. It may be manually depressed into the vented chamber against a biasing force to disconnect it.
Two radioactive sources are mounted in a holder which provides a window for each of the sources. In different embodiments the windows may be varied in size to vary the amount of radiation provided to each of the chambers independently without changing the parameters of the sources themselves.

REFERENCES:
patent: 3959788 (1976-05-01), Tipton et al.
patent: 4021671 (1977-05-01), Solomon

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