A gas tight tubing with a flange connection to tank allows a safer atmosphere outside the tank; all vapours are confined inside the SFA/E. With the same tightness, a SFA/E protects also the inside tank fluid from contamination with outside atmosphere.
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 or a continuous level 4-20 mA transmitter (optional accessories).

Pulleys are built in, into PVC elbows with a special cable no jump system. Elbows are glued on site to PVC tubes.
The balance weight allows an easy level reading. It is guided in a transparent PVC tube (Ø 63 x 57), tightly closed.
Assembly is connected to the tank with a PVC flange (ND 100).
The balance weight has a built in magnet to operate the level switches or a continuous level 4-20 mA transmitter (optional accessories).