Features: there is no movable mechanism in appearance, and it will not be stuck by floating objects. All parts in contact with liquid are made of plastic, which has good corrosion resistance. On-site suspension installation, suitable for underground pools. Using reed switch? Long service life and low price. FLA series floating ball magnetic liquid level controller is especially suitable for automatic alarm and control of liquids containing solid, semi-solid, semi-solid floating liquid and viscous liquid, such as sewage water, factory wastewater pool and other liquid storage tanks. When the liquid reaches a given position, the controller quickly turns over to make the reed switch signal. The range of motion can be set on site. Working principle: The basic components of the controller are composed of floating ball, cable, rope and heavy hammer. The reed switch signal group is hidden in a sealed floating ball. The reed switch is placed at the root of the floating ball, and the magnetic ring and the movable hammer are integrated and sleeved on the sliding tube to slide freely. When the top of the floating ball faces down, the moving hammer slides to the top of the floating ball, and the reed switch is far away from the magnetic ring, at this time, the reed switch is open; When the root of the floating ball faces down, the moving hammer slides to the root of the floating ball, and the reed switch is close to the magnetic ring, so that the reed switch is attracted.