Fire extinguishing condition monitoring apparatus for automatic fire extinguishing equipment
US4706760A · kind A · utility
4Cited by
3References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 19, 1985 |
| Grant date | Nov 17, 1987 |
| Priority date | — |
| Expiry date | Dec 19, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B17/113
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
Apparatus for monitoring the fire extinguishing condition of automatic fire extinguishing equipment which is adapted to detect flames and spray a fire extinguisher liquid from a nozzle to extinguish a fire. The apparatus comprises a detector for generating a signal corresponding to the light energy radiated by the flames and a fire determination circuit for determining that the fire extinguisher liquid is hitting the flames when the detector signal has a DC component but has no AC component, since the AC component corresponds to flicker of the flame and ceases when the fire is sprayed with the fire extinguisher liquid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.