Abstract: A pipette device comprises a pipette channel filled with compressible working gas, a pipette piston movable along the pipette path, a piston drive, which drives the pipette piston, a control device, a data memory connected to the control device for signal transmission, a pressure sensor which detects the pressure of the working gas and which is connected to the control device, a position sensor which detects a position of the pipette piston and which is connected to the control device. The control device is designed to determine a quality of a dispensing sequence on the basis of a target residual quantity value, which represents the target residual quantity of dosing liquid remaining in the pipette channel, of a working gas pressure and of an end position of the pipette piston, in each case after the end of the dispensing sequence, and to output the determined quality.

Abstract: A pipetting device includes a pipetting channel at least partially filled with working gas, a pipetting tip accessible through a pipetting opening such that the volume of dosing liquid drawn into the receiving chamber can be varied by changing the pressure of the working gas in the receiving chamber, a pipetting piston for changing the pressure of the working gas and accommodated in the pipetting channel to be movable along the pipetting channel, a drive driving the pipetting piston to perform a movement along the pipetting channel, a control device controlling the drive, and a pressure sensor sensing the pressure of the working gas. The control device controls the drive to generate a pressure pulse in the pipetting channel based on the pressure signal output by the pressure sensor whereby the pressure of the working gas during the pulse follows a predefined working gas target pressure pulse curve.

Abstract: A method for assigning a pipette tip to a certain class of pipette tips from a plurality of different pipette tip classes, the method including the following steps: coupling the pipette tip to a gas displacement device such that a device-side volume formed in the gas displacement device and a tip-side volume formed by the pipette tip communicate with each other, and thereby forming a measuring volume including the communicating volumes of the device-side volume and the tip-side volume; operating the gas displacement device and thereby changing the gas pressure in the measuring volume; detecting the gas pressure in the measuring volume over a detection time period; determining at least one absolute value of at least one characteristic variable characterizing the detected gas pressure; comparing the at least one determined absolute value with at least one predetermined calibration value; and, depending on the comparison result, assigning the pipette tip to a pipette tip class and outputting an item of class ass

Abstract: A pipetting device for outputting amounts of a dosing fluid of less than 1 ?l including a fluid volume; a pipetting plunger that can be moved along a plunger path, wherein a displacement of the pipetting plunger brings about a first pressure change in the fluid volume; a movement drive which is force-transmittingly connected to the pipetting plunger in order to drive the pipetting plunger such that it moves along the plunger path; a sound source which is designed to generate at least one sound impulse as a second pressure change in the fluid volume; and a control device which is designed to control the movement drive and the sound source, the pipetting device having a pipetting channel which extends along a channel axis and in which both the pipetting plunger is moveably accommodated along the channel axis as the plunger path and the fluid volume is accommodated, wherein the fluid volume includes a working gas which wets a plunger surface of the pipetting plunger, wherein, in addition, the sound source is des

Abstract: The present application relates to a pipetting device and a pipetting method for pipetting, therefore for aspirating and/or dispensing, a metered liquid using a working gas, independently of the flow- and/or wetting characteristics of the metered liquid, wherein a pipetting channel comprises a first working region, of which the known base temperature is in a lower base temperature range, and a second working region, of which the known working temperature is in a working temperature range that is increased with respect to the base temperature range.

Abstract: A pipetting apparatus and method for pulsed dispensing of small metered-liquid doses of no more than 1 ?l. The apparatus includes a pipetting conduit at least partly filled with working gas, a pressure-modifying apparatus for modifying the pressure of the working gas, and a control apparatus for applying control to the pressure-modifying apparatus. The control apparatus can control the pressure-modifying apparatus so as to generate in the pipetting conduit, with respect to a reference holding pressure in the pipetting conduit which is necessary for immovable holding of the metered-liquid quantity, an overpressure pulse having a pulse duration of no more than 40 ms.

Abstract: A pipette device comprises a pipette channel filled with compressible working gas, a pipette piston movable along the pipette path, a piston drive, which drives the pipette piston, a control device, a data memory connected to the control device for signal transmission, a pressure sensor which detects the pressure of the working gas and which is connected to the control device, a position sensor which detects a position of the pipette piston and which is connected to the control device. The control device is designed to determine a quality of a dispensing sequence on the basis of a target residual quantity value, which represents the target residual quantity of dosing liquid remaining in the pipette channel, of a working gas pressure and of an end position of the pipette piston, in each case after the end of the dispensing sequence, and to output the determined quality.

Abstract: A pipetting device includes a pipetting channel at least partially filled with working gas, a pipetting tip which is accessible through a pipetting opening such that the volume of dosing liquid drawn into the receiving chamber through the pipetting opening can be varied by changing the pressure of the working gas in the receiving chamber, a pipetting piston for changing the pressure of the working gas and accommodated in the pipetting channel so as to be movable along the pipetting channel, a drive for driving the pipetting piston to perform a movement along the pipetting channel, a control device for controlling the drive, and a pressure sensor for sensing the pressure of the working gas. The control device controls the drive to generate a pressure pulse in the pipetting channel based on the pressure signal output by the pressure sensor such that the pressure of the working gas during the pulse follows a predefined working gas target pressure pulse curve.

Abstract: A pipetting apparatus and method for pulsed dispensing of small metered-liquid doses of no more than 1 ?l. The apparatus includes a pipetting conduit at least partly filled with working gas, a pressure-modifying apparatus for modifying the pressure of the working gas, and a control apparatus for applying control to the pressure-modifying apparatus. The control apparatus can control the pressure-modifying apparatus so as to generate in the pipetting conduit, with respect to a reference holding pressure in the pipetting conduit which is necessary for immovable holding of the metered-liquid quantity, an overpressure pulse having a pulse duration of no more than 40 ms.