Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1988-08-25
1990-05-01
Eisenzopf, Reinhard J.
Communications: electrical
Condition responsive indicating system
Specific condition
340501, 340557, 340589, G08B 1700
Patent
active
049222309
ABSTRACT:
A fire discriminating apparatus for determining whether there is the outbreak of fire in an area under surveillance in accordance with the temperature difference between a temperature detection value of the area and a reference temperature. The apparatus includes a temperature sensor for detecting an ambient temperature; sampling means for sampling the detected temperature of the temperature sensor at a given period, temperature difference detecting means for computing a temperature difference between the detected temperature and a reference temperature each time the detected temperature is sampled by the sampling means, fire discriminating means whereby when the temperature difference is greater than a predetermined threshold value the outbreak of a fire is determined and an alarm command signal is generated, and reference temperature correcting means whereby a correction value obtained by multiplying the temperature difference obtained upon each sampling by a given factor smaller than 1 is added to the reference temperature to correct the reference temperature for the detection of temperature difference during the next sampling.
REFERENCES:
patent: 3781837 (1973-12-01), Anderson et al.
patent: 4388616 (1983-06-01), Machida
patent: 4644331 (1987-02-01), Matsushita et al.
patent: 4749986 (1988-06-01), Otani et al.
Ohtani Shigeru
Yamauchi Yukio
Eisenzopf Reinhard J.
Hochiki Corporation
Meller Michael N.
Mueller Robert W.
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