Abstract: A coupling element for a sterile flange connection for connecting fluid channels, comprising a fluid-contacting surface, a first opening end and a second opening end of the fluid-contacting surface, a flange part at the first opening end and/or at the second opening end, a connection plane, the connection plane being arranged normal to an axial coupling element axis of the coupling element and occluding the respective opening end of the coupling element in a delimiting manner, and a film, the film closing at least the first opening end of the fluid-contacting surface, with the coupling element comprising at least one film holding element separate from the coupling element and comprising a film-contacting surface to which the film is removably connected.

Abstract: A system for providing a sterile fluid connection between a first fluid channel and a second fluid channel. The system includes first and second coupling elements located at an orifice of each the first and second fluid channels, respectively. The first and second coupling element each include a foil that may be peeled off their respective orifices. The system additionally includes a connecting element configured to accommodate the first and second coupling elements and to press the orifices of the first and second fluid channels against one another. Additionally, this connecting element has a recess arranged essentially in the plane of the orifices of the fluid channels for passing the foils through the connecting element.

Abstract: A measuring device for a container having a process connection for determining the concentration of a constituent in an essentially liquid container content, comprising a concentration sensor, wherein the measuring device comprises a filter, an extraction line and a pump, wherein the filter is arranged within the container and the concentration sensor is arranged outside of the container, and the extraction line runs, starting from the filter, through the process connection to the concentration sensor, with the concentration sensor being connected to the pump, and the pump conveys the container content from the container through the filter across the extraction line to the concentration sensor, with the extraction line having at least one bend located between the filter and the process connection.

Abstract: A measuring device for a container having a process connection for determining the concentration of a constituent in an essentially liquid container content, comprising a concentration sensor, wherein the measuring device comprises a filter, an extraction line and a pump, wherein the filter is arranged within the container and the concentration sensor is arranged outside of the container, and the extraction line runs, starting from the filter, through the process connection to the concentration sensor, with the concentration sensor being connected to the pump, and the pump conveys the container content from the container through the filter across the extraction line to the concentration sensor, with the extraction line having at least one bend located between the filter and the process connection.