When the photoelectric fails because the target is not visible, then capacitive proximities come into play.

With a capacitive sensor it is possible to detect level of a liquid, or powder material inside a tank. This allows to avoid the direct contact between the sensor and the material itself.

Datasensing has a very comprehensive product range of capacitive sensors, either with plastic and metal housing.Cylindrical sensors, from M12 to M30 threads, represent an effective solution for several applications, whereas cubic flat housing sensors are recommended where the limited space represents a constraint