The working principle of M10 PP vertical float level switch is direct and simple. Set one point or multipoint of magnetic switch in sealed unmagnetic metal or industrial plastic tube. Fix the float with inner magnetic system to a certain place of magnetic switch in the pipe and let the float drift up and down; utilize the inner magnetic system in the float to trigger the open and close of magnetic switch to operate and control the liquid level. Normal open and normal close is the state with inserting liquid. Mini float level switch is custommade product and the switch state can shift in normal condition. Mini float level switch is widely used in level control and alarm of all kinds of industry such as electronic, electric power, chemical, watertreatment, water supply and drainage due to its low price, reliable performance and flexible installation method.