A float switch is a commonly used water level controller, which controls the water level by the up and down movement of the float. The principle of the float switch is to utilize the principle of buoyancy, when the liquid level rises, the float will rise with it, when the float rises to a certain height, the switch will be triggered, to control the switch of the pump or the valve to achieve the purpose of controlling the water level. This article mainly introduces the installation method and adjustment method of the float switch.