Combined method of determining fires

Details Combined method of determining fires Combined method of determining fires

1992-01-02

1993-11-09

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular system function

340511, 340521, 340588, G08B 1900

Patent

active

052606872

ABSTRACT:
First sensors measure physical quantities correlated with the heat release value of a fire source, and second sensors measure physical quantities correlated with the amount of the product of burning. At least a pair of one first sensor and one second sensor are arranged in a zone to be monitored. A first threshold of high sensitivity and a second threshold of low sensitivity are set at the first sensors. A third threshold is set at the second sensors. A pre-alarm is given only when the level of signals from the second sensors exceeds the third threshold. A fire alarm is given when the level of the signals from the second sensors exceeds the third threshold and when the level of signals from the first sensors exceeds the first threshold. The outputs from a plurality of such sensors detecting different objects, such as heat and smoke, are processed in the manner in which these outputs are combined together to reliably detect fires and to give a fire alarm. It is possible to improve the accuracy of detecting fires, and to reduce the incidence of false alarms.

REFERENCES:
patent: 4459583 (1984-07-01), van der Walt et al.
patent: 4517554 (1985-05-01), Moser et al.
patent: 4546344 (1985-10-01), Guscott et al.
patent: 5105371 (1992-04-01), Shaw et al.
patent: 5128653 (1992-07-01), Yuchi

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