Fire detecting system
US4975684A · kind A · utility
31Cited by
18References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 9, 1989 |
| Grant date | Dec 4, 1990 |
| Priority date | — |
| Expiry date | Jun 9, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B17/00
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A fire detector having a first sensor for emitting a first output signal in response to a fire phenomenon, a second sensor for detecting a source of false alarm conditions generated by man and/or machinery and an evaluating circuit. The evaluating circuit has a mechanism for activating an alarm signal when the value of the output of the first sensor exceeds a threshold value. The threshold value is set by the second sensor in response to the detection of signals generated during normal use of the premises to be protected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.