EP 1619640 A1 20060125 - Scattered-light smoke detector
Title (en)
Scattered-light smoke detector
Title (de)
Streulichtrauchmelder
Title (fr)
Detecteur de fumée à lumière diffusée
Publication
Application
Priority
EP 04017433 A 20040723
Abstract (en)
A scattered-light smoke detector comprises an optoelectronic arrangement for measuring scatter signals (SB, SF) at, at least, a forward and a backward scatter angle, and evaluation electronics (12) for determining an alarm value in dependence of the ratio of the scatter signals (SB, SF) and comparing it with an alarm threshold. The scatter signals (SB, SF) are preprocessed and the alarm threshold is weighted. The weighting of the alarm threshold occurs in dependence on the relation of the scatter signals (SB, SF). There occurs additionally a weighting of the relation of the scatter signals, whereby the weighting factor is selectable in an application-specific manner.
IPC 8 full level
G08B 17/107 (2006.01); G08B 29/20 (2006.01); G08B 29/24 (2006.01)
CPC (source: EP)
G08B 17/107 (2013.01); G08B 29/24 (2013.01)
Citation (search report)
- [DXY] US 6218950 B1 20010417 - POLITZE HEINER [DE], et al
- [X] US 2004066512 A1 20040408 - POLITZE HEINER [DE], et al
- [Y] US 5293049 A 19940308 - MOREY RICHARD K [US], et al
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
DOCDB simple family (application)
EP 04017433 A 20040723