The float switch is composed of a magnetic reed switch and a float. There are magnetic materials in the float. One or more magnetic reed switches are set in a closed non-magnetic metal tube or plastic tube, and then the catheter is passed through one or more belts. A floating ball with magnetic material, and using a fixed double ring to control the floating ball and the magnetic reed switch in the relevant position, the floating ball rises or falls with the liquid, and the magnet in the ball is used to attract the contact point at the beginning of the magnetic reed to produce an opening and closing action. For liquid level control or indication (when the float is close to the reed switch, it is turned on; when it leaves, the switch is turned off). Normally open and normally closed are the conditions when no liquid is written.

When choosing a float switch, what should be a good float switch and choose a float switch that suits your needs? According to the raw materials, the float switch can be divided into stainless steel and plastic. A good quality float switch can be used for a long time and worry-free. As long as the raw materials of the float switch are selected accurately, the float switch can be used under any liquid, temperature and pressure. Therefore, a float with a larger outer diameter should be selected when encountering a liquid with a relatively high viscosity that will not dry up. The float switch uses a magnet to sense the reed switch, so the measured liquid level should be free of iron filings, otherwise it will affect the action of the float switch.
    
How to choose the float switch of your own needs? You should choose float switches of various specifications according to the characteristics of temperature, pressure, specific gravity, acid resistance, etc., such as plastic foods suitable for water media, home appliances and other commodities. The stainless steel type all stainless steel has a long service life, high temperature resistance, and is used in water, oil, and weak acid-base environments.