Easy to install. Switch is designed for easy removal of control box and assembly from from t-pieces. Pendulum all off stainless steel construction. Switch: can be used as N.O or N.C contact.

The device works according to the paddle principle. The paddle is fixed on a bearing and protrudes into the flow. A magnet is attached to the opposite side. A second, external magnet repels the paddle magnet. This produces a restoring force.

This force may be set by changing the distance between the magnets by means of a screw so that the switching point of the device can be adjusted easily and precisely. A reed switch fixed to the outside is actuated contact­free by means of the magnet on the pendulum.