measuring device for measuring the pressure of a medium in a container and capacitive druckmesszelle

摘要

It is a measuring device for the measurement of the pressure of a medium in a container is described, with a capacitive pressure measuring cell (10) and a metallic, rotationally symmetrical process connection (3), wherein the pressure measuring cell (10) a deflectable ceramic measuring diaphragm (11), the first side at least partially in contact with the medium, and the second side remote from the medium a measuring electrode (14), and one of the second side of the measuring diaphragm (11) arranged opposite one another and ceramic cylindrical base body (12) with at least one of a measuring capacity to the measuring electrode (14) in the form of the counter electrode (15), wherein the measuring diaphragm (11) by means of an annular joint (13) with the base body (3) is connected with the formation of a measuring chamber, and wherein the pressure measuring cell (10) in the interior of the art (3) is fixed and the measuring diaphragm (11) and an inner wall portion (3) of an annular, via a channel (5) is connected with the container pressure measurement space (6) by means of a sealing element (7) terminate in a pressure-tight manner and for this purpose on the measuring diaphragm (2) and at the inner wall portion of two opposing sealing surfaces (8a, 8b) are provided. According to the invention, the deflectable measuring diaphragm (11) on its first side with an annular projection (11a), with respect to which a stub-like, in the interior projecting extension (5a) of the channel (5) and the sealing surfaces (8a, 8b) are parallel to the axis of symmetry (s) of the art (3) is arranged further of a correspondingly pressure measuring cell described.