Arrangement for connecting a measuring instrument (1) with a container containing the medium to be measured consisting of– a measuring device (1) with an at least in the region of the (100) partially rotationally symmetrical casing,– an adapter (200) with an axially extending through hole and is constructed as a resilient sealing web (210) in the through hole and– a between the measuring device (1) and the adapter (200) arranged sealing element (300),between the measuring device (1) and the adapter (200) of a detachable and tight connection is,with the sealing element (300, 310) between the process connection (100) and the sealing web (210) is arranged andthe measuring apparatus (1) in the region of the (100) a region for the accommodation of the preferably annular sealing element (300, 310) comprises,characterised in that the sealing element (300, 310) of a material having a modulus of elasticity of at least 1000 mpa and in that a maximum pressing of the sealing element (300, 310) exclusively in a quasi linear zone facing the medium is,with the sealing element (300, 310) of a chemically resistant and heat resistant thermoplastic material, in particular of polyether ether ketone (peek).
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