GAS SHUTOFF SYSTEM FOR DETECTING HUMAN BODY BY USING ULTRASONIC SENSOR

摘要

PURPOSE: A gas shutoff system for sensing a human body by using an ultrasonic sensor is provided to improve the safety and convenience for use, and to prevent gas leakage or fire by automatically shutting off gas after the predetermined time with detecting the user. CONSTITUTION: A gas shutoff system for sensing a human body is composed of a control body(18); a solenoid valve(11) connected to the control body, installed in a gas pipe and opened or closed by the control body; an ultrasonic sensor(16) installed in the control body to detect a user; a gas sensor(19) installed in the front of the control body to detect gas leak; a power switch(17) applying power to the control body with pushing; a microcomputer circuit unit closing the solenoid valve by shutting off power after the predetermined time in not sensing the user; a waiting time setting button setting waiting time to shut off the valve in not sensing the user; an input terminal(14) installed in the control body and connected to 220V power; an output terminal(13) installed in the control body and connected to the gas shutoff solenoid valve; and a DC adapter(12) applying direct current of 12V to the ultrasonic sensor.