The optoelectronic level switch is used for level detection for liquids. Due to the variety in designs, the use of optoelectronic sensors is suitable for many industries. The determination of the level with the cone tip is, across wide ranges, independent of physical characteristics such as refractive index, colour, density, dielectric constant and conductivity. The measurement procedure is thus not influenced by the properties of the liquid and offers high media compatibility. They are mostly used in industrial applications, the food and beverage industry or even the pharmaceutical industry.