Fire alarm system with sensitivity adjustment
US5552763A · kind A · utility
48Cited by
6References
41Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 10, 1993 |
| Grant date | Sep 3, 1996 |
| Priority date | — |
| Expiry date | Nov 10, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B29/26
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A fire alarm system automatically adjusts sensitivity of individual sensors based on evaluation of background level over a period of time. High sensor signals which do not trigger a fire alarm may, after a delay time, result in decreased sensitivity to avoid false alarms. On the other hand, low peak values stored over a period on the order of months result in an automatic increase in sensitivity of the system. The sensitivity is adjusted by changing the delta threshold of an alarm threshold over a quiescent sensor signal average.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.