EP 0127645 B1 19881117 - FIRE ALARM AND ELECTRODE DEVICE THEREFOR
Title (en)
FIRE ALARM AND ELECTRODE DEVICE THEREFOR
Publication
Application
Priority
CH 702882 A 19821203
Abstract (en)
[origin: WO8402215A1] Fire alarm with a measure chamber (9, 9') limited by two electrodes (1, 2), an electric field being generated between the electrodes by a direct voltage source. The measure electrode (1) has no direct connection with the direct voltage source (4) at the input of a current measuring unit (3). As soon as smoke laden particles enter the measure chamber (9) between the electrodes, the electric field causes a displacement of positive and negative particles. Due to said charge displacement (charge drift), a current is induced in the measure electrode, current which is measured.
IPC 1-7
IPC 8 full level
G01N 27/64 (2006.01); G08B 17/10 (2006.01); G08B 17/113 (2006.01)
CPC (source: EP US)
G08B 17/10 (2013.01 - EP US); G08B 17/113 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE FR GB LI NL SE
DOCDB simple family (publication)
WO 8402215 A1 19840607; AU 2983784 A 19860102; AU 572517 B2 19880512; CH 666135 A5 19880630; DE 3378505 D1 19881222; EP 0127645 A1 19841212; EP 0127645 B1 19881117; JP S60500073 A 19850117; JP S6356596 B2 19881108; US 4652866 A 19870324
DOCDB simple family (application)
CH 8300137 W 19831202; AU 2983784 A 19840625; CH 702882 A 19821203; DE 3378505 T 19831202; EP 83903778 A 19831202; JP 50380383 A 19831202; US 64194684 A 19840829