The piston-type switch (FS) operates according to a modified variable area principle. The device is equipped with a springloaded
piston inside a cylindrical tube. The flowing medium moves the piston in the direction of the flow corresponding to
flow rate. A reed contact is situated outside the device. This reed contact is infused in a stepless adjustable housing and
thus protected from external influences. When the float reaches along with its integrated magnet the reed switch contact
actuates. If the flow is higher the piston continues to move (maximum up to the stopper that prevents overriding of the
operating range). This ensures a bistable switching action at any time.

The piston-type switch (FS) operates according to a modified variable area principle. The device is equipped with a springloaded
piston inside a cylindrical tube. The flowing medium moves the piston in the direction of the flow corresponding to
flow rate. A reed contact is situated outside the device. This reed contact is infused in a stepless adjustable housing and
thus protected from external influences. When the float reaches along with its integrated magnet the reed switch contact
actuates. If the flow is higher the piston continues to move (maximum up to the stopper that prevents overriding of the
operating range). This ensures a bistable switching action at any time.