Abstract: A shaft connection is provided between a first shaft and a second shaft, the first shaft having a longitudinal axis about which the first shaft can be rotated. The first shaft has a free end which engages into a coupling part which can be connected in a rotationally fixed manner to the second shaft. The free end of the first shaft is provided with an external profile which engages releasably into an internal profile of the coupling part. The external profile and/or the internal profile are/is configured in each case as a dihedron with two side surfaces which extend substantially parallel to one another. At least one side surface of the external profile and/or one side surface of the internal profile are/is configured in a convex manner in the longitudinal direction of the first shaft and/or the second shaft.

Abstract: A sampling system has a first connecting piece for connecting to a pipe traversed by fluid and a third connecting piece, and a cock which has a basic body with a longitudinal axis, about which the cock can be pivoted between a first end position and a second end position. The sampling system further has a sampling recess. In the first end position, the sampling recess can be connected via the first connecting piece to the pipe traversed by media. In the second end position, the sampling recess can be connected to the third connecting piece, in which the third connecting piece is connected to a first end of an extraction needle which can be pierced with a second end through a membrane of a sampling volume. In the second end position, the sampling recess is connected via the third connecting piece to a first end of a ventilation needle.

Abstract: A shaft connection is provided between a first shaft and a second shaft, the first shaft having a longitudinal axis about which the first shaft can be rotated. The first shaft has a free end which engages into a coupling part which can be connected in a rotationally fixed manner to the second shaft. The free end of the first shaft is provided with an external profile which engages releasably into an internal profile of the coupling part. The external profile and/or the internal profile are/is configured in each case as a dihedron with two side surfaces which extend substantially parallel to one another. At least one side surface of the external profile and/or one side surface of the internal profile are/is configured in a convex manner in the longitudinal direction of the first shaft and/or the second shaft.