Fire discriminating apparatus
US4922230A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 25, 1988 |
| Grant date | May 1, 1990 |
| Priority date | — |
| Expiry date | Aug 25, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B17/06
- WIPO fieldControl
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.