Smoke detector

Details Smoke detector Smoke detector

1976-12-01

1978-10-03

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

250381, G08B 1710

Patent

active

041186893

ABSTRACT:
A smoke detector comprising a smoke detection cell of the ionization type and an electrical network which provides for ac operation of the detection cell. The impedance of the smoke detection cell is very high (40,000 megohms) and changes in the presence of airborne combustion products. The network senses the impedance change by a measurement of the current through the chamber assuming an ac source under a short circuit load condition, a technique facilitating the use of bipolar transistors.

REFERENCES:
patent: 3516083 (1970-06-01), Meyer

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