With PROTRAC levels and limit heights are detected contactlessly. Since the measuring facility is mounted on the outside of the vessel, the measuring result is not influenced by physical and chemical properties of the measured product. In addition, measurements on pressurized vessels or on vessels with agitators can be realised without problems. For different vessel forms and sizes, various detector versions are offered which are also cascadable for use on very huge vessels.

Configuration of a radiation-based level measurement: Gamma source and detector (opposite side) form a measurement unit. The damping of the radiation is proportional to the level.