A sensitive element for a capacitive level sensor, comprising an electrode housing, the housing comprising a metal section formed by at least two tubes that are connected to each other at least partially along the length of each tube, and further comprising at least one tube-like stiffener distinct from said tubes, the at least one stiffener in contact with at least two adjacent tubes of the metal section, wherein the stiffener extends along the entire length of the housing;
- therewith each tube of the section has a slit aligned axially with a corresponding vent hole in a lateral side and arranged at least partially lengthwise at least in one side adjacent to a measured medium;
- therewith the electrode housing contains electrodes rigidly fixed in each tube of the metal section, and these electrodes are metal tubes having the same unit-length capacitance but differing in their length, and a main electrode is mostly as long as the electrode housing, and each of one or more compensation electrodes is shorter than the main electrode.