在所有工业过程使用水库、silos or storage tanks, you need to know the level of the stored elements, or at least be able to detect significant levels (i.e. a full or empty tank). This is what level sensors and detectors are used for. Although these two terms might seem like synonyms, the two devices are fundamentally different: while a detector indicates whether the level has reached a certain height, a sensor gives a continuous measurement of the height of the level. Detectors are therefore used to manage alerts or level setpoints. There are several measurement technologies available for sensors and it is important to choose the technology that is the most appropriate for the intended application.