Schaltungsanordnung zur Stromversorgung einer Feuermeldungseinheit nach dem Entladungsprinzip

Circuit d'alimentation pour un ensemble de détection et d'alarme de feu du type à décharge

Energizing circuit for discharge-type fire alarm sensor unit

Abstract

An energizing circuit for a discharge-type fire alarm sensor unit which includes a circuit (A) for supplying output pulses to a discharge tube (8) to render the tube ready to discharge, a discharge frequency detecting circuit (C) for supplying a feedback signal, and a control circuit (D) responsive to the feedback signal for increasing the frequen­ cy of the output pulses from the circuit (A) when the frequency of the discharges of the tube (8) increases as indicated by the feedback signal so that the sensor is continuously sensitive to ultraviolet radiation such as is caused by the flames of a fire disaster but is insensitive to spontaneous radioactivity.

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Patent Citations (4)

    Publication numberPublication dateAssigneeTitle
    BE-878831-AMarch 17, 1980Roos Rein AndreMethode tot het verminderen van het opgenomen vermogen en het verbeteren van de branddetecterende eigenschappen bij gasgevoelige halfgeleiders
    DE-2831466-A1February 01, 1979Graviner LtdStrahlendetektorvorrichtung
    FR-2290715-A1June 04, 1976Graviner LtdProcede et appareil d'optimisation de la reponse de transducteurs
    US-4068130-AJanuary 10, 1978Chloride IncorporatedSmoke detector with means for changing light pulse frequency

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