Chemical smoke or pollutant detector

Details Chemical smoke or pollutant detector Chemical smoke or pollutant detector

1977-04-28

1979-04-03

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

340632, 422 98, G08B 1710

Patent

active

041480228

ABSTRACT:
A smoke or pollutant sensor has first and second conductors in non-electrical contact and a coating, between the first and second conductors, which chemically reacts with by-products of combustion to allow electrical conduction between the first and second conductors. A heating and cooling mechanism may be provided to condense the smoke onto the sensor during the cooling cycle and to aid the chemical reaction and the evaporation of any condensed water during the heating cycle. Third and fourth conductors may be provided without the coating material, and the first, second, third and fourth conductors may be connected to a detector for detecting changes in conductivity in the presence of smoke to provide an alarm function, the third and fourth conductors acting as a reference sensor to compensate for changes in humidity and atmospheric pressure.

REFERENCES:
patent: 1489247 (1924-04-01), Hill
patent: 3493484 (1970-02-01), Berg et al.
patent: 3594751 (1971-07-01), Ogden et al.
patent: 3812362 (1974-05-01), Larsen et al.

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