The CD34.. capacitive sensor is designed for detecting water-based (conductive) liquids through a non-metallic container wall, and it automatically adapts to various thicknesses of plastic pipes.
The universal mounting brackets allow the sensor to be fixed on various tubes or containers. The sensing principle in the CD34 detects only the level of the liquids while ignoring foam, film or build-up that would cause standard capacitive sensors to mis-detect.