Fire detector drift compensation
US10204508B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 29, 2016 |
| Grant date | Feb 12, 2019 |
| Priority date | — |
| Expiry date | Apr 29, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B21/182
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A fire detector system comprises a fire detector unit; a sensor disposed in the fire detector unit and arranged to detect the characteristics of a fire and to generate an output signal indicative of the characteristics detected by the sensor; and a processor arranged to receive the output signal from the sensor and to generate afire alarm signal when the output signal exceeds an alarm point threshold; wherein the system is arranged to change the alarm point threshold over time to compensate for drift in the response of the detector unit; wherein the fire detector unit includes a first sensitivity mode with a first drift compensation limit and a second sensitivity mode with a second drift compensation limit, the second sensitivity mode being more sensitive than the first; and wherein, as the first alarm point threshold in the first sensitivity mode is approached or reached, the mode of the system is changed to the second sensitivity mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.