The simple operating principle is suitable for a wide variety of applications. Suitable for virtually all liquids. Continuous measurement of liquid levels independent of physical or chemical changes of the liquid, e.g. foam, conductivity, pressure, vacuum, temperature, vapor. Display proportional to the height of the level or the contents of the vessel. Programmable loop-powered control units 4 ... 20 mA available. High availability of corrosion resistant materials. Application specific designs available. Explosion-proof designs.