LPG liquefied petroleum gas is a mixture of propane and butane, usually accompanied by a small amount of propylene and butene, and is a flammable and explosive liquid. The LPG gas tank level sensor is the non-invasive ultrasonic level sensor, provides continuous, reliable, and accurate liquid level measurement for large spherical liquefied petroleum gas LPG tanks. This LPG level sensor can measure the LPG inside the tank without touching the liquid outside the tank. The measurement can be completed by simply sticking the ultrasonic level sensor probe to the tank, which is convenient to install, High precision.