Abstract: A metering head for a metering machine having a carrier having parallel attachments for picking up pipette tips wherein each attachment has a tube having a supporting protrusion at the bottom end at least one sleeve which surrounds the tube and can be axially shifted on the tube, and at least one elastomer O-ring which surrounds the tube a pressure plate above the sleeves having a plurality of first holes through which the tubes extend, wherein the pressure plate can be shifted along the tubes from a release position into a clamping position where the sleeves are pressed, at the bottom ends, against the adjacent O-rings, and the O-rings are expanded to clamp pipette tips; and a first shifting apparatus connected to the pressure plate moving the pressure plate between the release position and clamping position.

Abstract: A centrifuge, in particular as a laboratory centrifuge, has a centrifuge container in which a centrifuge rotor can be accommodated, a centrifuge motor for driving the centrifuge rotor, and a housing with a base and lateral side walls. The centrifuge container, the centrifuge rotor and the centrifuge motor are accommodated in the housing. A temperature control device for controlling the temperature of the centrifuge rotor has air directing means which are adapted to suck in air into the centrifuge container in a lower region. Such temperature control of the centrifuge operates more effectively than before. At the same time, the cooling of heat-emitting centrifuge components, such as the centrifuge motor and electronic components, takes place. The temperature control also functions if a safety container is arranged around the centrifuge container.

Abstract: The invention relates to a control apparatus for a refrigerator compressor having at least one two-phase AC asynchronous motor (K1, K2), having mains connection means (10) for connection to a preferably public voltage supply network which nominally provides a mains AC voltage of between 85 V and 264 V, in particular between 100 V and 230 V, first voltage converter means (14) which are connected downstream of the mains connection means and are intended to generate an intermediate voltage, in particular an intermediate DC voltage, from the mains AC voltage, second voltage converter means (16-1, 16-2) which are connected downstream of the first voltage converter means and are intended to generate an output signal which is independent of a level and a mains frequency of the mains AC voltage, in particular has a constant voltage and/or frequency in periods, and is intended to control the refrigerator compressor with an AC voltage of a plurality of differently predefinable voltage levels, wherein the mains connecti

Abstract: A refrigerator fan device, comprising: a fan motor (10) which has a fan rotor (12) and which can be provided in an air duct between an air inlet (16), a refrigerator heat exchanger (15), and/or a refrigerator compressor (14) and an air outlet (18) on or in a refrigerator housing (20, 22), said fan motor (10) being connectable to a unit of the refrigerator, via electrical supply and/or control lines, wherein the fan motor (10) is realized as a brushless speed-controllable DC motor whose operating speed is or can be controlled as a function of an operating and/or used cooling space temperature signal of, the assigned or assignable refrigerator compressor.

Abstract: The invention relates to a method for controlling a laboratory system comprising at least partially networked laboratory devices for processing samples by means of laboratory processes performed by the laboratory devices, the method comprising:-a process detection step (S1), in which samples to be processed and/or laboratory processes to be performed with the samples are detected via a detection unit (05);-a status determination step (S3), in which a response of networked laboratory devices regarding the current and/or future status and/or the termination of sample processing is obtained by the laboratory devices;-a task update step (S4), in which a task list, at least for the processing of certain samples by means of a certain laboratory device or a plurality of certain laboratory devices in a certain order, is created or updated by a task generation unit at least from the detected samples and/or laboratory processes and/or on the basis of the status of the laboratory devices, in particular by considering pr

Abstract: A metering head for a metering machine having a carrier having parallel attachments for picking up pipette tips, wherein each attachment has: a tube having a supporting protrusion at the bottom end, at least one sleeve which surrounds the tube and can be axially shifted on the tube, and at least one elastomer O-ring which surrounds the tube, a pressure plate above the sleeves having a plurality of first holes through which the tubes extend, wherein the pressure plate can be shifted along the tubes from a release position into a clamping position where the sleeves are pressed, at the bottom ends, against the adjacent O-rings, and the O-rings are expanded to clamp pipette tips; and a first shifting apparatus connected to the pressure plate moving the pressure plate between the release position and clamping position.

Abstract: A method and a device for monitoring the rotational speed of an element are disclosed. The element may be part of a centrifuge, e.g. a motor, drive shaft, or rotor of a laboratory centrifuge. The rotational speed of the element is not determined directly, but rather clock cycles are counted while the element rotates by a predetermined rotational angle. Exceeding a predetermined rotational speed is determined by comparing a number of counted cycles with a predetermined value. The method and device can be implemented in hardware without requiring a microcontroller with corresponding software, thereby eliminating a need to software certification.

Abstract: A pipetting head comprises a carrier, at least one attachment held on the carrier and configured to secure at least one pipette tip, and two O-rings retained on the at least one attachment and configured to contact the sealing seat of the at least one pipette tip. The inner diameter of the sealing seat of the at least one pipette tip is smaller than an outer diameter of a respective O-ring where the sealing seat contacts a respective O-ring. The respective O-ring is deformed while the pipette tip is slid onto the at least one attachment to securely clamp the at least one pipette tip. The sealing seat of the at least one pipette tip is dimensioned such that the at least one attachment exerts a force on the pipette tip to deform the at least one pipette tip when it is securely clamped on the at least one attachment.

Abstract: A spindle drive comprising a threaded spindle with an external thread, a spindle nut with an internal thread that is in engagement with the external thread of the threaded spindle, characterized in that the external thread of the threaded spindle has multiple threaded areas that are separated from each other by first flattenings on their circumference extending in the longitudinal direction, and the first flattenings have guide areas that abut the core diameter of the internal thread of the spindle nut.

Abstract: A connection construction (10), between a centrifuge rotor (12) and a drive shaft (14) of a laboratory centrifuge (100), allows one-handed operation that does not require any additional tools. The connection construction (10) is designed such that the locking mechanism (16, 48) is constantly guaranteed, preventing the jamming or blocking of the locking elements (16, 48). In addition, the user receives a reliable indication of a locked state (16, 48) by a clearly noticeable click.

Abstract: Art automated laboratory system comprises a work area comprising a plurality of predefined workstations, wherein each of the plurality of predefined workstations occupies a footprint of a standardized microtiter plate. At least one movement device is configured to move tools above the work area and at least one transport tool is configured to be moved by the movement device in order to relocate laboratory items within the work area. At least one pipetting tool is configured to be moved by the movement device in order to pick up and release pipette tips. A holder for pipette tip carriers comprises at least one carrying apparatus defining a rectangular through-opening, and a support apparatus connected to the carrying apparatus. An electronic control apparatus is connected to the movement device and configured to control movements of the transport tool and at least one pipetting tool by the movement device.

Abstract: A centrifuge includes a swing rotor. Rotor arms of the swing rotor have recesses into which hangers of the swing rotor at least partially swing in a swung-out state. As a result, the centrifuge container and thus also the centrifuges are more compact, because the swinging-out requires less space. An inertial mass of the swing rotor is reduced due to the recesses provided therein, whereby energy consumption, primarily when starting the centrifuge, is significantly reduced.

Abstract: A connection construction (100) between a centrifuge rotor (102) and a drive shaft (104) of a laboratory centrifuge (200) allows one-handed operation that does not require any additional tools. The connection construction (100) is designed such that the locking mechanism (118, 132, 134) is constantly guaranteed, preventing the jamming or blocking of the locking elements (118, 134).

Abstract: A pipette comprises a housing extending from a lower end to an upper end and a neck extending from the lower end of the housing and configured to hold a pipette tip. A stroke rod comprising an upper end and a lower end is configured to displace a tip plunger in the pipette tip. A drive apparatus is configured to displace the stroke rod to: (1) aspirate a liquid specimen into the pipette tip held on the neck; and (2) to eject the specimen from the pipette tip by means of a tip plunger positively connected to the stroke rod. At least one locking sleeve is arranged coaxially with the stroke rod and configured to be displaceably guided toward the stroke rod in the housing, The locking sleeve is configured to inhibit release of a tip plunger from the stroke rod.

Abstract: A multichannel pipetting head comprises a plunger actuator comprising at least one groove with an upper border, and a lower border. A plurality of plunger-cylinder units, wherein each plunger-cylinder unit comprises a cylinder and a plunger comprising a plunger head. The plunger head comprises a projecting upper abutment region adjoining the upper border, a projecting lower abutment region adjoining the lower border and laterally offset relative to the projecting upper abutment region, a plurality of guides. Each of the cylinders is coupled to a neck and held on each of the plurality of guides. During lateral movement of the plurality of guides, the plunger head is configured to tilt in the groove and to be held with the upper abutment region abutting the upper border and with the lower abutment region abutting the lower border of the groove due to restoring forces that occur during tilting in the plunger-cylinder units.

Abstract: A pipette for use with a pipette, tip or syringe, including a piston positioned within a cylinder comprises a pipette housing extending between an upper end and a lower end. Two parallel rods are positioned in the pipette housing, wherein one of the two parallel rods is coupled to a lifting rod. An operating element is configured to protrude outwardly from the pipette housing and be displaced relative to the pipette housing. A gear mechanism is arranged in the pipette housing and comprises a drive comprising a moveable input member and configured to be driven by the operating element, and an output comprising at least one moveable output member and configured to drive the two parallel rods. Successive displacements of the input member by the operating element are configured to alternately displace one of the two parallel rods and then another of the two parallel rods by the output member.

Abstract: A pipette with an adjustable volume comprises a housing comprising an outside surface, at least one seat defining an opening, and a displacement apparatus defining a displacement chamber comprising a displacement element configured to be displaced therein. A stroke rod is coupled to the displacement element and configured to be displaced relative to the housing order to displace the displacement element. An adjusting apparatus is configured to adjust a position of an upper stop in the housing, a display apparatus is configured to display a set dosing volume, and a coupling apparatus is positioned between the adjusting apparatus and the display apparatus. The coupling apparatus is configured to couple the adjusting apparatus to the display apparatus in an engaged state and configured to uncouple the adjusting apparatus from the display apparatus i.n a disengaged state.

Abstract: A metering head comprising: a carrier having parallel attachments, a stop plate having first holes through which the attachments extend, each attachment having: a tube with a projecting supporting protrusion, a sleeve with a tapering at the bottom end, an elastomer O-ring that encloses the tube, and the sleeves can be shifted between a release position and a clamping position; in the clamping position, the sleeves with the taperings are pressed into the O-rings and expand them, a first shifting apparatus shifting the sleeves between the release position and the clamping position, a second displacement apparatus shifting the stop plate between a stop position and an ejection position, wherein the second shifting apparatus has rocker arms pivotably mounted on the carrier, transmission shafts that are coupled to the sleeves, and ejection shafts which are securely connected to the stop plate.

Abstract: A method for dosing liquid by using a pipette and a syringe, including releasably connecting the syringe to the pipette. Then displaying the dosing volume corresponding to a set dosing increment by using a display apparatus. Next, sucking liquid into the syringe by actuating a drawing lever. Next, detecting a respective position of a drive element along its path of movement when the drive element is shifted along the path. Finally, determining and displaying by the display apparatus a possible maximum number of dosing steps with the set dosing increment without refilling the syringe after executing a reverse stroke starting from a position of the drive element reached at the end of filling.

Abstract: A multichannel syringe for use with a metering device having a barrel holding apparatus of a syringe barrel and an axially movable holding apparatus of a syringe plunger 5 comprising: a plunger unit having a drive rod comprising the plunger holding apparatus, a crossmember on the lower end of the drive rod, and a plurality of syringe plungers projecting downward and parallel to the drive rod, a barrel unit comprising a support and rows of syringe barrels arranged in a parallel 10 manner, protruding downwards from the support, and having lower and upper syringe openings, and a running region, wherein each syringe plunger engages a syringe barrel through, an upper syringe opening and is sealingly guided in the running region, and the barrel holding apparatus is above the syringe barrel and is connected to the support.