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Capacitive point level detection

The technology of capacitive point level measurement is based on the capacity of an electric condenser which is constituted by a liquid medium and the wall of a tank resp. of a tube. Capacitive level sensors from Anderson-Negele have been developed for the detection of the infill level in hygienic environments such as breweries, dairy plants and the pharmaceutical industry. They excel in reliability, economic application and simplicity of use.

Functioning Principle of the Capacitive level measurement

The capacity of a condenser is determined principally by three factors. The distance and the dimension of the electrode surface and the type of dielectric fluid between the electrodes. In case of capacitive level measurement by means of a probe only the type of dielectric fluid is crucial.

Application examples for capacitive level sensors from Anderson-Negele:

While the measuring electrode of the sensors and the vessel wall form the capacitor plates, the liquid becomes the dielectric medium. Due to the superior permittivity (dielectric constant) value of the medium compared to air the capacity increases by growing coverage of the electrode. The alteration of capacity is measured by the electronic devices of the capacitive level sensor and transformed into a switch command.

Capacitive level measurement of foaming and adhesive media

Foaming and adhesive products in food and drink production processes make a real challenge for the level sensor technology.

The solution by Anderson-Negele:
The capacitive operating mode requires a full coverage of the PEEK sensor tip by the medium. This fact guarantees that the sensor doesn’t respond to foam or adhesions but only reacts if the actual infill level of the medium reaches the position of the sensor tip.
Functioning Principle of Capacitive level measurement

(1)Tank / Pipe wall (2) Medium (3) Electric field lines

View Capacitive Level Sensors