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LPG gas leakages result in many accidents in both property and human life. The main cause for such explosion may be due to substandard cylinders, old valves, worn out regulators, and lack of awareness in handling gas cylinders. It leads to explosion, fire, suffocation, etc., which is caused due to their physical properties such as toxicity, flammability, etc. The fatal accidents caused by the explosion of LPG gas cylinder have been increased in recent times. Our objective is to design a hardware setup which can be implemented practically for the detection of such LPG gas leakages, which leads to fatal accidents. To develop a circuitry using suitable sensors, valves, contactors, and relay arrangements to detect to leakage and shut off the flow of LPG automatically from the cylinder and power supply to the house with an indicator and send SMS alert to the authority. The main subject of our project is to provide a solution by shutting down the main switch, and alarm system has been used as output. The system once implemented can reduce the fatal accidents and decrease the risk of failure resulting in health hazard give to substandard cylinder.