The sensor principle based on a Pelton water wheel is remarkable for its high reliability - proven over more than ten years of service. This flow meter is to be found in applications in a variety of plants, where not only negligible volumetric flow rates of media such as fuels, distilled water, or hot greases are measured, but also high flow rates normally found in power stations. The sensors satisfy almost all industrial requirements with temperature limits of 135 °C and nominal pressures up to 345 bar (higher pressures upon request). Only V4 A Supra St.St. (material no. 1.4571) or titanium is used for metallic parts. Swiss precision bearings ensure long service life and reliability. Sensors with solid sapphire bearings and no metal parts have been developed to measure aggressive liquids such as sulphuric acid and hydrochloric acid.