Float switches are used for the point-based limit level detection of one or several levels. They work independently of foaming, conductivity, dielectric, pressure, vacuum, temperature, vapours, condensation, bubble formation, boiling effects and vibrations and are suitable for almost all liquid media. The switching operation is contact-free, free from wear and needs no power supply. The simple and proven functional principle of the float switches enables a very wide range of applications, from general industrial applications through to use in process plants.