Detection of blockages and interruptions with an aspirating smoke detector (ASD)
US9134716B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 11, 2011 |
| Grant date | Sep 15, 2015 |
| Priority date | — |
| Expiry date | Oct 14, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B29/043
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An aspirating smoke detector detects blockages and interruptions in a pipe system. Air is aspirated, by a ventilator and via the pipe system, from rooms and devices that are to be monitored, and monitoring takes place for any characteristics of burning. The air flow of at least one part of the aspirated air is measured, as is the air temperature. A blockage signal is emitted if the air flow falls below a predetermined lower limit value and/or an interruption signal is emitted if the air flow rises above a predetermined upper limit value. The rotational speed of the ventilator is increased as air temperature rises and reduced as air temperature lowers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.