A Design of Circuit Break Detector for a P-type Fire Detector Central Control

摘要

Fire detector central controls installed in present buildings of Taiwan belong to the P-type. All fire alarm sensors in the same zone are connected to the same circuit. On-site inspectors cannot confirm the source of the fire as a fire occurs and the circuit is disconnected. There is also no way of distinguishing which detector is out of service in the event of a fire alarm as the disconnected circuit causes detectors to be disabled. The on-site inspector does not respond in time. That is the main cause of increased fire damage. In practice, the detection of circuit disconnection must be carried out by fire practitioners using ladders or scaffolds to measure the circuit voltage of all detectors on the circuit. In addition to increasing maintenance costs with high floors, it also increases the risk of inspectors falling from heights. Therefore, this study provides a fire alarm disconnection detector of a P-type fire detector control. We designed an extension rod equipped with a 1 kHz, 10 Vp-p AC signal audio transmitter/receiver for preventing the fire alarm the disconnected circuit, connecting to the audio transmitter, and using the extension rod to detect all detectors that are disconnected on the circuit to reduce the danger of fire practitioners during the detection and improve the detection efficiency.