Alarm system

Details Alarm system Alarm system

G - Physics

08

B

G08B 29/00 (2006.01) G01R 31/02 (2006.01) G01R 31/28 (2006.01) G08B 29/06 (2006.01)

Patent

CA 2122173

An alarm system is described wherein both an open connection between an alarm monitor and an alarmed unit or a short circuit across the connection between the monitor and the unit can be detected. A controllable, normally open test device is placed in parallel with a normally open alarm contact. If current flows when the test device is open, either a short circuit or an alarm condition exists. If current does not flow when the test device is closed, an open connection between the monitor and the unit exists. Advantageously, the integrity of connections between alarm monitors and alarmed units is enhanced.

Cette invention concerne un système d'alarme dans lequel on peut détecter aussi bien un circuit ouvert entre le moniteur d'alarme et un dispositif déclencheur d'alarme qu'un court-circuit entre lesdits moniteur et déclencheur d'alarme. Un circuit d'essai commutable normalement ouvert est monté en parallèle avec un contact d'alarme normalement ouvert. Si le courant passe lorsque ce circuit est ouvert, il y a soit court-circuit soit signal d'alarme. Si le courant ne passe pas lorsque ce circuit est fermé, il y a un circuit ouvert entre le moniteur et le déclencheur d'alarme. L'invention présente l'avantage de rehausser l'intégrité des connexions entre le moniteur et les déclencheurs d'alarme.

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