Abstract: A method for detecting the type of replaceable piston-cylinder unit mounted in pipetting or dosing apparatus with the help of a code marking on the piston rod head, so as to eliminate the influence of the chain of tolerances piston rod head/piston rod/piston/cylinder bottom/cylinder flange so that, to a certain extent, larger tolerances may be tolerated for the parts of the piston-cylinder units involves generating relative movement between the piston rod head and a detection device, and thereby detecting a reference point on the piston head with the detection device from laterally of the piston head, and generating relative movement between the piston rod head and the detection device and thereby detecting a code marking of the piston rod head in order to determine the type of piston-cylinder unit mounted.

Abstract: A dosing device with which several, preferably two, liquids can be measured and dispensed in precise quantities. In this dosing device, two bottle-top dispensers with integrated suction valves, discharge valves and a bottle-top mechanism are attached in a housing. A liquid-reservoir bottle can be affixed to the bottle-top mechanism of each bottle-top dispenser. In particular, affixing of the respectively associated reservoir bottles is ensured without confusion. Activation of the pistons of the bottle-top dispensers takes place with working strokes which differ depending on the spacing. In addition, the housing comprises a blow-out device by means of which, after each dispensing procedure, the discharge device for the liquids can be blown out and cleared of any liquid residues.

Abstract: A multiple channel pipetting device and pipette shaft, in which each pipette shaft has a circumferential seal receptacle inside, at its upper end in which the circumferential plunger seal is positioned and in which the circumferential plunger seal, at least in the case of a pulled back pipette plunger, definitely remains in the seal receptacle when the pipetted shaft is removed from the shaft carrier.

Abstract: A pipette for the handling of a syringe. The pipette has jaw chucks which are adjustably arranged with respect to the plunger receptacle, being pivotably mounted on a plunger-gripping device. The syringe is insertable with opened jaw chucks with the plunger head only partially contacting the jaw chucks. The jaw chucks are laterally engageable on the plunger head upon insertion of the syringe. The engaging movement of the jaw chucks on the plunger head is regulated according to the invention so that the engaging movement has a substantially tangential component with respect to the surface of the plunger head. As a result, a desired and form-locking connection to the plunger head of the syringe results that requires a small amount of force.

Abstract: A metering device for liquids, especially for viscous liquids, preferably liquids which are to be metered under sterile conditions, with a plurality of metering pumps which can be simultaneously actuated. To achieve an optimized mode of operation, it is provided that the surfaces on the bottom of the pump holding plate and the top of the metering channel plate are made as adjoining sealing surfaces, forming a seal, that, in the pump holding plate, there is a bypass channel with outlet openings in the sealing surface on the bottom of the pump holding plate for each metering pump and that by the relative displacement of the pump holding plate and the metering channel plate with respect to one another, the outlet openings of the bypass channel can be moved into a position in which the bypass channel connects the respective metering channel to the respective supply channel in the metering channel plate.