EP 0991042 A2 20000405 - Signalling device and monitoring system
Title (en)
Signalling device and monitoring system
Title (de)
Signalgeber und Überwachungssystem
Title (fr)
Dispositif de signalisation et système de surveillance
Publication
Application
Priority
GB 9821059 A 19980928
Abstract (en)
A signalling device, such as a fire detecting device, has a head (2) which is removable from a base (1). The head has circuit means (4,5,6) for sensing and signalling a change in given condition. The base is connected to supply lines and has fault signalling means (3) for generating a fault signal due to head removal or some other device fault. As the same signal is generated in each case, the invention provides an economic, simple and reliable solution to the problem of signalling fault conditions. Preferably, the fault signalling means includes a first circuit (3) in the base (1) which responds to an output from a second circuit (7) in the head (2) so that, if the head is not fitted to the base, the first circuit (3) responds to the absence of said output from the second circuit (7) in order to apply the fault signal to the lines.
IPC 1-7
IPC 8 full level
G08B 17/00 (2006.01); G08B 29/04 (2006.01); G08B 29/06 (2006.01)
CPC (source: EP)
G08B 29/043 (2013.01)
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
GB 2341964 A 20000329; GB 2341964 B 20021211; GB 9821059 D0 19981118; EP 0991042 A2 20000405; EP 0991042 A3 20010110; JP 2000113341 A 20000421
DOCDB simple family (application)
GB 9821059 A 19980928; EP 99307216 A 19990921; JP 27370199 A 19990928