EP 1062647 A1 20001227 - FIRE ALARM BOX
Title (en)
FIRE ALARM BOX
Title (de)
BRANDMELDER
Title (fr)
AVERTISSEUR D'INCENDIE
Publication
Application
Priority
- DE 9802750 W 19980917
- DE 19809896 A 19980307
Abstract (en)
[origin: DE19809896A1] The invention relates to a fire alarm call box for detecting gaseous and powdery combustion products, comprising at least one optical transmitter and at least two optical receivers, each for sending an electrical signal to an evaluation unit connected downstream. At least one of said optical receivers (28) is located beyond a direct range of radiation (8) of the optical transmitter (2) and acts as a scattered light receiver. At least one other optical receiver (4) is located within the direct range of radiation (8) of the optical transmitter (2). A gas sensitive layer (18) is connected upstream of this optical receiver (4). Upon contact with a specific gas, said layer preferably absorbs light components of a certain narrow wavelength range.
IPC 1-7
IPC 8 full level
G01N 21/27 (2006.01); G01N 21/49 (2006.01); G01N 21/53 (2006.01); G01N 21/75 (2006.01); G08B 17/103 (2006.01); G08B 17/107 (2006.01)
CPC (source: EP US)
G08B 17/107 (2013.01 - EP US); G08B 17/113 (2013.01 - EP US)
Citation (search report)
See references of WO 9945515A1
Designated contracting state (EPC)
CH DE ES FR GB IT LI
DOCDB simple family (publication)
DE 19809896 A1 19990909; DE 59805266 D1 20020926; EP 1062647 A1 20001227; EP 1062647 B1 20020821; ES 2182366 T3 20030301; JP 2002506261 A 20020226; JP 3864048 B2 20061227; US 6479833 B1 20021112; WO 9945515 A1 19990910
DOCDB simple family (application)
DE 19809896 A 19980307; DE 59805266 T 19980917; DE 9802750 W 19980917; EP 98952572 A 19980917; ES 98952572 T 19980917; JP 2000534985 A 19980917; US 62366801 A 20010406