Fire discriminating apparatus
First Claim
1. A fire discriminating apparatus comprising:
- a temperature sensor for detecting a temperature in an area under surveillance to generate a detected temperature output signal proportional thereto;
sampling means for intermittently sampling said detected temperature data detected by said temperature sensor at a predetermined period;
temperature difference detecting means whereby each time said detected temperature data is sampled by said sampling means, an output corresponding to a temperature difference between said sampled detected temperature and a predetermined reference temperature is generated;
fire discriminating means whereby when said 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 is produced by multiplying a value of said temperature difference obtained upon each said sampling by a predetermined factor smaller than 1 and said correction value is added to said reference temperature to correct the same for the purpose of temperature difference detection during the next sampling.
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Accused Products
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.
17 Citations
4 Claims
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1. A fire discriminating apparatus comprising:
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a temperature sensor for detecting a temperature in an area under surveillance to generate a detected temperature output signal proportional thereto; sampling means for intermittently sampling said detected temperature data detected by said temperature sensor at a predetermined period; temperature difference detecting means whereby each time said detected temperature data is sampled by said sampling means, an output corresponding to a temperature difference between said sampled detected temperature and a predetermined reference temperature is generated; fire discriminating means whereby when said 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 is produced by multiplying a value of said temperature difference obtained upon each said sampling by a predetermined factor smaller than 1 and said correction value is added to said reference temperature to correct the same for the purpose of temperature difference detection during the next sampling. - View Dependent Claims (2, 3, 4)
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Specification