EP 0045335 A1 19820210 - E field balanced phase intrusion alarm.
Title (en)
E field balanced phase intrusion alarm.
Title (de)
Eindringungsmelder nach dem E-Feldprinzip mit balancierter Phase.
Title (fr)
Alarme d'intrusion utilisant un champ E à phase balancée.
Publication
Application
Priority
EP 80302678 A 19800805
Abstract (en)
An intrusion alarm is provided having one or more pairs of sense wires wherein each of a pair of sense wires (13,15) leads to a balanced circuit (19) whereby there is no alarm output if both of the sense wires are subjected to the same perturbation. Thus, false nuisance alarms are avoided.
IPC 1-7
IPC 8 full level
G08B 13/24 (2006.01)
CPC (source: EP)
G08B 13/2497 (2013.01)
Citation (search report)
US 4053877 A 19771011 - TORLESSE ARTHUR TIMOTHY, et al
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI LU NL SE
DOCDB simple family (publication)
DOCDB simple family (application)
EP 80302678 A 19800805