Abstract: The invention relates to a device for flow-injection analysis having a reaction loop, one or more pumps, an injection valve, one or more detectors and an evaluating device.

Abstract: The specification describes an interference optical measuring or sensing device, comprising a light source, a beam splitter, two component light paths and a radiation sensor for a multiple hole centrifuge rotor. When the rotor is in motion sample cells and the counter-weight move successively through the component light paths and at a particular position have both light paths extending through them. There is furthermore an arrangement for producing a position signal indicating that a selected hole is in a certain position in which it has both component light paths extending through it. A control arrangement ensures that the measuring device is activated briefly in the predetermined position of the selected hole. The light source continuously supplies light between the periods of activation of the measuring device.

Abstract: The specification describes a double sector cell for ultra-centrifuges. It comprises a tubular housing comprising a lower window holder with a lower window, a cell arrangement and an upper window holder with an upper window. There are radial filling openings, which allow access to one respective cell of the cell arrangement and are closed by sealing plugs. The cell arrangement comprises two sector cell center pieces forming respected pairs of cell chambers. Between the chambers a center window is arranged in a centering ring. The housing has two pairs of filling openings, which when the cell is assembled are flush with the associated filling holes of the center pieces.