Multiple detector alarm latch and release system

摘要

A plurality of fire, smoke, security or other detectors of the type which respond to the existence of a predetermined condition are each connected to an input circuit. Each input circuit is connected to one indicator circuit and when a detector is triggered, the input circuit associated with that detector generates a signal which in turn actuates and latches on the corresponding indicator circuit. The indicator circuit remains latched on even after the detector returns to an untriggered condition and the input circuit signal is removed. A first release circuit is provided to release all indicator circuits which have been latched on. When a predetermined number of detectors simultaneously respond to their respective predetermined conditions, an alarm signal generates an input to by-pass the first release circuit, thus precluding the first release circuit from releasing the plurality of indicator circuits. A second release circuit is provided to release all the indicator circuits after an alarm signal has been generated. The present system also provides a latched on signal indicative of intermittent fault conditions.