DEVICE FOR TESTING DISCONNECTION DETECTING FUNCTION IN FIRE ALARM EQUIPMENT

PURPOSE:To detect fire in the case of testing a disconnection detecting function and to immediately return a fire sensor to a monitoring state after the disconnection detecting function is completely tested. CONSTITUTION:A reception resistor Rr is connected to a fire sensor SE in series and the disc...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser:	OGAWARA ATSUSHI
Format:	Patent
Sprache:	eng
Schlagworte:	ALARM SYSTEMS MEASURING MEASURING ELECTRIC VARIABLES MEASURING MAGNETIC VARIABLES ORDER TELEGRAPHS PHYSICS SIGNALLING SIGNALLING OR CALLING SYSTEMS TESTING
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Beschreibung
Zusammenfassung:	PURPOSE:To detect fire in the case of testing a disconnection detecting function and to immediately return a fire sensor to a monitoring state after the disconnection detecting function is completely tested. CONSTITUTION:A reception resistor Rr is connected to a fire sensor SE in series and the disconnection detecting function is provided on a fire alarming facility so as to discriminate whether a line is disconnected or not by comparing a reception signal detected by this reception resistor Rr with a reference voltage at a comparator C1 for disconnection detection. The serial circuit composed of a switching element SW1, which is turned on in the case of testing the line disconnection detecting function, and a prescribed resistor RO is connected in parallel to the reception resistor Rr.