Fire detector

Details Fire detector Fire detector

1985-02-21

1986-10-21

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular system function

340511, 340512, 340514, 340589, 34087021, 34087024, G08B 2600

Patent

active

046188533

ABSTRACT:
A fire detector which outputs a change in physical phenomena caused by fire, such as a change in smoke density, in the form of analog voltage signal, by, for example, a photoelectric type sensor, an ionization type sensor, a thermal sensor, a gas sensor or the like, converts the output voltage into a pulse width corresponding to the voltage level by a voltage-pulse width converting circuit, counts quick clock pulses over the pulse width by a pulse counter, and transmits the count output from the pulse counter, in the form of digital signal, to a central signal station.

REFERENCES:
patent: 3667046 (1972-05-01), Schoolcraft
patent: 4077030 (1978-02-01), Helava
patent: 4087796 (1978-05-01), Brown
patent: 4103337 (1978-07-01), Whiteside
patent: 4311986 (1982-01-01), Yee
patent: 4408166 (1983-10-01), Moeller

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