Circuit arrangement for monitoring noise levels of detectors...

Details Circuit arrangement for monitoring noise levels of detectors... Circuit arrangement for monitoring noise levels of detectors...

G - Physics

08

B

340/72

G08B 29/00 (2006.01) G08B 29/18 (2006.01)

Patent

CA 1205884

INVENTORS: PETER WaGLI and STEFAN TEMPERLI INVENTION: CIRCUIT ARRANGEMENT FOR MONITORING NOISE LEVELS OF DETECTORS ARRANGED IN AN ALARM INSTALLATION ABSTRACT OF THE DISCLOSURE The circuit arrangement generating at least one noise-level warning threshold monitors the noise-level of detectors in an alarm system. The noise-level warning threshold assumes a fixed relation to the operating or working point level of the signal transmitted by the detector of the alarm system while taking into account consideration shifts in the level of the operating or working point. An alarm storage or buffer disposed in the detector is set without transmitting an alarm signal when the noise-level warning threshold has been exceeded. The noise-level is monitored during normal operation and gives sufficiently early warning of a tendency to generate false alarms.

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