Abstract: For dispensing volumes of liquids, a hinged septum has a flap inclined with respect to the longitudinal axis of a liquid channel. A deposition device deposits liquid on the flap, wherein the deposition device is arranged to contact the flap.

Abstract: A tube fitting provides a sealed flow connection between an open-ended duct that extends along the longitudinal axis of a tube and an open-ended duct of a base element, for liquid separation technology. The tube fitting has a ring-shaped thrust piece with a receptacle for the tube and a ring-shaped, spring-elastic compensating element with receptacle for the tube. The tube fitting further comprises a fastening element that can be fastened tightly to the base element. When sealed, the base element, the thrust piece, the compensating element and the tube can be braced by means of the fastening element under elastic deformation of the compensating element. A spring serves as a compensating element, wherein the spring and the connection parts arranged within the spring excursion range are coordinated to each other such that a leaky connection caused by elastic deformaton or material settling of parts braced together is excluded.

Abstract: The invention concerns a tube fitting (20) for providing a sealed flow connection between an open-ended duct (23) that extends along the longitudinal axis (22) of a tube (21) and an open-ended duct (26) of a base element (25), for liquid separation technology, in particular for analytical or preparative HPLC. The tube fitting (20) has a ring-shaped thrust piece (27) with a receptacle (28) for the tube (21) and a ring-shaped, spring-elastic compensating element (30) with a receptacle (31) for the tube (21). The tube fitting (20) further comprises a fastening element (35) that can be fastened tightly to the base element (25). The tube (21) preferably provides a ring flange (36) on its end (24) connected to the base element (25) that protrudes from the longitudinal axis (22) of the tube (21). When sealed, the base element (25), the thrust piece (27), the compensating element (30) and the tube (21) can be braced by means of the fastening element (35) under elastic deformation of the compensating element (30).

Abstract: A connecting capillary for analytical measuring-technology, in particular for high pressure liquid chromatography and for capillary electrophoresis, comprises a glass capillary, in particular a fused silica capillary, which is characterized in that the glass capillary is surrounded at least it its end regions by a sheath of polyetheretherketone (PEEK) or a PEEK-derivative.

Abstract: A diode array spectrophotometer has an entrance slit apparatus, a diffraction grating, a diode array and a casing to define the relative positions of these elements. The casing and the holder for accepting the diffraction grating are made of a ceramic whose coefficient of thermal expansion is adapted to that of the diode array. The grating holder has a cylindrical outer surface and is situated within a conic-frustum-shaped opening of the casing. Between the grating holder and the conic-frustum-shaped opening, there are a plurality of filler elements which are made of ceramic or glass.