EP 0039761 A3 19811125 - FIRE ANNUNCIATING ARRANGEMENT AND METHOD
Title (en)
FIRE ANNUNCIATING ARRANGEMENT AND METHOD
Publication
Application
Priority
CH 364080 A 19800509
Abstract (en)
[origin: US4405919A] A fire alarm installation possessing increased intelligence which enables differentiating between smoldering fires and fires having open or licking flames. This capability is obtained in that the fire alarm installation possesses two sensor elements working according to different functional principles and an evaluation circuit contains circuit elements which form the quotient of the signals received from both sensor elements. The different sensor elements can be united in a single fire alarm housing which simultaneously contains the evaluation circuit.
IPC 1-7
IPC 8 full level
G01N 21/53 (2006.01); G08B 17/00 (2006.01); G08B 17/06 (2006.01); G08B 17/10 (2006.01); G08B 17/103 (2006.01); G08B 17/113 (2006.01); G08B 23/00 (2006.01); G08B 25/00 (2006.01); G08B 29/18 (2006.01)
CPC (source: EP US)
G08B 17/00 (2013.01 - EP US); G08B 17/10 (2013.01 - EP US); G08B 17/113 (2013.01 - EP US)
Citation (search report)
- CH 579309 A5 19760831 - NOHMI BOSAI KOGYO CO LTD
- CH 580310 A5 19760930 - NOHMI BOSAI KOGYO CO LTD
- CH 583946 A5 19770114 - NOHMI BOSAI KOGYO CO LTD
- DE 2358449 A1 19740612 - CERBERUS AG
- US 3922656 A 19751125 - HORVATH ZOLTAN, et al
- DE 2737090 A1 19780817 - SECURITY PATROLS CO, et al
- FR 2380542 A1 19780908 - SECURITY PATROLS CO [JP]
Designated contracting state (EPC)
AT BE DE FR GB IT NL SE
DOCDB simple family (publication)
EP 0039761 A2 19811118; EP 0039761 A3 19811125; JP H026392 U 19900117; JP H0319030 Y2 19910422; JP S576988 A 19820113; US 4405919 A 19830920
DOCDB simple family (application)
EP 81101265 A 19810221; JP 16092188 U 19881213; JP 6842781 A 19810508; US 25778381 A 19810427