The float, suspended to a cable supported with 2 pulleys, drives a balance weight inside the external transparent tube.
The balance weight has a built in magnet to operate the level switches.

This SFA level indicator includes a float and a balance weight linked together by cable sliding on 2 pulleys.
The balance weight is guided inside a transparent PVC tube (Ø 63 x 57) and allows an easy level reading.
The guiding tube is fixed with PE collars; it is equipped in option with PVC graduated ruler and level switches.