Level Switch, Flow Line Displacer

The float with the wire is moved up or down by buoyancy together with changes in water level. The magnet at the top of the wire detects the water level by enabling the built-in lead switch to open or close. The spring supports weight of wire and float and adjusts switching variations.
This lead switch is basically free from any influence of water ripple or flow thanks to the self-locking circuit and the balance weight at the bottom of the wire.