Ionization-chamber smoke detector system

Details Ionization-chamber smoke detector system Ionization-chamber smoke detector system

1975-12-22

1976-10-19

Yusko, Donald J.

Communications: electrical

Systems

Call station

250381, G08B 1710, G08B 1712

Patent

active

039874230

ABSTRACT:
This invention relates to an improved smoke-detection system of the ionization-chamber type. In the preferred embodiment, the system utilizes a conventional detector head comprising a measuring ionization chamber, a reference ionization chamber, and a normally non-conductive gas triode for discharging when a threshold concentration of airborne particulates is present in the measuring chamber. The improved system is designed to reduce false alarms caused by fluctuations in ambient temperature. Means are provided for periodically firing the gas discharge triode and each time recording the triggering voltage required. A computer compares each triggering voltage with its predecessor. The computer is programmed to energize an alarm if the difference between the two compared voltages is a relatively large value indicative of particulates in the measuring chamber and to disregard smaller differences typically resulting from changes in ambient temperature.

REFERENCES:
patent: 2646556 (1953-07-01), Allen
patent: 2759174 (1956-08-01), Brailsford
patent: 2809317 (1957-10-01), Meili
patent: 2981840 (1961-04-01), Nahmias
patent: 3018376 (1962-01-01), Vanderschmidt
patent: 3160866 (1964-12-01), Meili
patent: 3235858 (1966-02-01), Mader
patent: 3245067 (1966-04-01), Blevins
patent: 3271756 (1966-09-01), Crawford et al.
patent: 3295121 (1966-12-01), Meyer
patent: 3564524 (1971-02-01), Walthard et al.

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