Environmental abnormality detecting apparatus

Details Environmental abnormality detecting apparatus Environmental abnormality detecting apparatus

1984-12-12

1987-01-20

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

340511, 340628, 340632, 340630, 340661, 34087016, 250565, G08B 2300, G08B 1710

Patent

active

046383042

ABSTRACT:
An environmental abnormality detecting apparatus for detecting abnormality in atmosphere such as heat, smoke, and a gas. A sampling circuit is provided for periodically sampling analog signals from a detector for detecting these phenomena. A quantizer quantizes sampled signals with step levels. An accumulator having a plurality of counters provides different accumulation times corresponding to the step levels. Reliability in accumulation effect is not degraded, and an abnormality signal can be detected in a short period of time when a degree of abnormality is high.

REFERENCES:
patent: 3872449 (1975-03-01), Scheidweiler
patent: 4078156 (1978-03-01), Langah
patent: 4146750 (1979-03-01), Spiesmah
patent: 4254414 (1981-03-01), Street et al.
patent: 4414539 (1983-11-01), Armer
patent: 4517554 (1985-05-01), Moser et al.

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