Testing a fire detector sensor
US7609154B2 · kind B2 · utility
2Cited by
5References
23Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 29, 2005 |
| Grant date | Oct 27, 2009 |
| Priority date | — |
| Expiry date | May 17, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B29/123
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A method is disclosed for testing the functionality of a sensor (1) of a fire detector during operation thereof. The method comprises applying a current-limited test signal to the sensor (1), the test signal being such that the impedance of the sensor is such as to absorb the current-limited test signal when the sensor is operating normally; and applying the output of the sensor to a test signal detector (7). The arrangement is such that the test signal passes the output terminal of the sensor (1) only when the sensor is not operating normally.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.