Environmental abnormality alarm apparatus
US4831361A · kind A · utility
19Cited by
3References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 8, 1988 |
| Grant date | May 16, 1989 |
| Priority date | — |
| Expiry date | Jun 8, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B23/00
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An environmental abnormality alarm apparatus includes a sensor for detecting a fire, gas leakage, a burglar, or the like in a monitoring area, and a signal processor for receiving an output from the sensor and evaluating the output for an alarm determination reference and generating an alarm. A detecting unit is provided in the monitoring area of the sensor to detect a change in environmental condition resulting from objects or conditions other than those to be detected by the sensor, and an alarm determination reference is changed in accordance with an output state of the detecting unit during signal processing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.