Abstract: This invention relates to plunger operated liquid dispensers, such as hand held pipettors, which are used to portion liquids. Specifically the invention relates to a reliable removal of a liquid from the liquid dispenser. According to the invention the plunger of the liquid dispenser is arranged into a speeded up movement while removing the liquid. This change in speed is preferably sudden.

Abstract: This invention relates to plunger operated liquid dispensers, such as hand held pipettors, which are used to portion liquids. Specifically the invention relates to a reliable removal of a liquid from the liquid dispenser. According to the invention the plunger of the liquid dispenser is arranged into a speeded up movement while removing the liquid. This change in speed is preferably sudden.

Abstract: The object of this invention is a method for attaching a pipette tip and an apparatus for such method. The method comprises the following steps: opening the interlocking which attaches the replaceable part with the help of electronically controlled interlocking mechanism for detaching or receiving the replaceable part; saving the information of the opening of the interlocking mechanism to the control electronics of the pipette; closing the interlocking which attaches the replaceable part with the help of the electronically controlled interlocking mechanism for attaching the replaceable part; saving the information of the closing of the interlocking mechanism to the control electronics of the pipette; providing the dispensing parameters and/or type and/or size of the replaceable part with the help of a keyboard to the control electronics to ensure the attachment of a desired replaceable part and to achieve pipetting readiness.

Abstract: This invention relates to plunger operated liquid dispensers, such as hand held pipettors, which are used to portion liquids. Specifically the invention relates to a reliable removal of a liquid from the liquid dispenser. According to the invention the plunger of the liquid dispenser is arranged into a speeded up movement while removing the liquid. This change in speed is preferably sudden.

Abstract: A multichannel pipette, the suction tube arrangement of which is arranged to be resilient, so that a disposable tip is attached similarly to each suction tube regardless of the shape and elastic characteristics of a tip rack. The pipette comprises a body and a plunger-cylinder system with suction tubes for each channel. Each suction tube is thus adapted to the body, that the suction tube is movable between two extreme positions in its vertical direction with respect to the body.

Abstract: The object of this invention is a method for attaching a pipette tip and an apparatus for such method. The method comprises the following steps: opening the interlocking which attaches the replaceable part with the help of electronically controlled interlocking mechanism for detaching or receiving the replaceable part; saving the information of the opening of the interlocking mechanism to the control electronics of the pipette; closing the interlocking which attaches the replaceable part with the help of the electronically controlled interlocking mechanism for attaching the replaceable part; saving the information of the closing of the interlocking mechanism to the control electronics of the pipette; providing the dispensing parameters and/or type and/or size of the replaceable part with the help of a keyboard to the control electronics to ensure the attachment of a desired replaceable part and to achieve pipetting readiness.

Abstract: A pipette for use with disposable tips and having ejector and actuating devices for detaching the disposable tips from the pipette. The actuating device includes at least one cam element for interacting with the ejector, connected to the pipette body by a pivotal joint. The mechanism makes it possible to vary the torque conversion ratio of the cam element throughout the operation cycle of the actuator. It is particularly well suited for use with a multi-tip device in which the force required for tip ejection is larger than in single tip devices.

Abstract: The object of the invention is a method for adjusting the dispensing volume in a pipette having a spring for returning a plunger to its initial position. The invention is characterized in that when the pipetting volume is adjusted, the spring moves in accordance with the adjustment together with the adjustment members, preserving its length and/or pretension, whereby the tension of the spring does not change when the pipetting volume is adjusted. The object of the invention is also a pipette for implementing the method.

Abstract: A method for removing a replaceable tip used with a suction device for dispensing a liquid removes the tip by bringing a removal device, arranged in an air space formed jointly by a sample space of a replaceable tip and a cylindrical space of an end part of a suction device, movable between its two extreme positions, namely an inner home position and an outer removal position, into cooperation with an inside surface of the replaceable tip mounted on the end part whereby the movement of the removal device into its removal position causes the replaceable tip to be detached from the end part. A suction device is provided for using the method.

Abstract: A pipette, comprising: a cylinder (1) with liquid passage (3), a plunger (4), and a plunger operating assembly (5) for moving the plunger in the cylinder; the operating assembly comprising a body (6), a threaded rod (7), an operating member (8) cooperating by mediation of threads with the threaded rod, and a power unit (9) for rotating the threaded rod and the operating member relative to each other for moving the plunger by mediation of the threaded rod and the operating member when the threaded rod and the operating member are rotated relative to each other with the aid of the power unit; the thread of the threaded rod (7) or alternatively that of the operating member (8) being non-linear locally over a certain transition range.

Abstract: A procedure for filling and emptying a pipette with quantative accuracy, wherein the distance travelled by a plunger (3) is measured as the plunger is being moved and the plunger is arrested when the travel corresponding to the desired quantity of liquid to be transferred has been reached, and a pipette comprising a elements (14, 23, 24) for measuring the travel of the plunger (3) and a elements (13) for controlling the movements of the plunger.

Abstract: The invention concerns a thermostated cuvette set in which samples placed in the cuvettes are measured photometrically. Cuvettes of uniform wall thickness are permanently fixed to the bottom of a basin-shaped frame. The cuvettes are connected by partition walls to each other and to the walls of the basin to form arrays of cuvettes defining a path for flow of the thermostating medium. In a preferred embodiment the path is serpentine. The cuvette set also includes at least one inlet opening and at least one outlet opening in the wall of the basin for circulation of the thermostating medium.

Abstract: A valve including a valve body having a surface with a plurality of orifices with a resilient closure membrane adjacent thereto is disclosed. The membrane is positioned to yield in response to a pressure differential so as to permit flow between respective ports. A male closure member is mounted to selectively urge the membrane into contact with the periphery of an orifice in order to prevent liquid flow therethrough in accordance with a desired flow arrangement. Further refinements include spring biasing of the closure mechanism, which in one construction has a movable carriage provided with a roller.

Abstract: Microcuvette set which comprises several cuvettes (5) in a matrix form, arranged so as to be handled as one whole unit. The frame portion of the microcuvette set (1) consists of a preferably rectangular frame portion (2) designed so that two or more cuvette-set components (3) can be attached to it in the longitudinal or transverse direction one after the other. Each of the said cuvette-set components (3) consists of several cuvettes (5) disposed in a line or matrix form and connected to each other or attached together by means of a support plate (4), and the middle portion of the frame portion (2) is open at least within the area covered by the cuvettes (5) in the cuvette-set components (3). The microcuvette set (1) comprises a rectangular locking frame (6), open at its middle portion at least within the area corresponding to the frame portion (2), which locking frame is arranged so as to be attached to the top face of the frame portion (2), e.g.

Abstract: A photometer with controllable heating plates both above and below the set of sample cuvettes. The photometer is in particular used so that the upper plate is regulated to be warmer.

Abstract: Method for the precise dilution of a liquid sample, in which diluting agent is pumped through a main channel (1) open at its lower tip and, at the same time, sample is pumped through a side channel (2), whose lower tip (11) opens into the main channel. The invention can be used e.g. in photometers.

Abstract: Method and apparatus for the measurement of properties of a liquid present in a vessel (2), for example for the measurement of the absorbance of a liquid, of the properties of an agglutination, precipitate (4) or any other reaction result placed on the bottom of a vessel, by means of radiation and of a detector (3) receiving radiation while the vessel moves along with a rotor revolving around the vertical axis (15) of a centrifuge. Thereby the beam of measurement (5) coming from the source of radiation (1) passes substantially horizontally and the intensity of the radiation passing through, or reflected from, the contents of the vessel is measured.

Abstract: A code system for the identification of a sample group to be measured in a multi-channel photometer or in any other multi-channel analysis equipment, e.g. in a spectrophotometer, fluorometer, luminometer, turbidometer, nefelometer, cell counter, or isotope counter. The samples to be measured have been fitted in the matrix form into cuvette sets, sets of test tubes, or pit plates, and the measurement takes place preferably in the vertical direction. The sample group to be measured is provided with a related code piece, such as a code plate, containing the measurement points to be ready by means of the analysis equipment. According to the invention, the measurement points of the code piece are in the same order and with the same relative distances as compared with the measurement channels of the said multi-channel photometer or any other multi-channel analysis equipment, or with a part of or a multiple of said channels.

Abstract: The invention is a filter device for the filtration of radiation in a device for measuring radiation. The filter device comprises several different filters fitted into one detachable disk. The filter device comprises a magnet which is placed at a vertical plane passing through the center axis of the filter disk, not higher than at the level of the center axis. The filter disk includes a second magnet placed at the center axis of the disk. The opposite poles of these two magnets are arranged as facing towards each other.

Abstract: There is disclosed a micro-cuvette unit comprising a plurality of components in the form of a matrix which is arranged so that the cuvettes may be handled as one unit. The structural body of the micro-cuvette unit comprises a rectangular frame which is designed so that a plurality of cuvette components may be fitted to the frame, one after another. Each cuvette component comprises a plurality of cuvettes arranged in the form of a line or matrix and connected to each other directly or by means of support discs. The frame part of the micro-cuvette unit is open in the middle, at least within the area covered by the cuvettes in the cuvette components. The frame part contains two opposite sides which are provided with connecting means for joining the cuvette components to the frame part.