A pipette for use with a pipette tip includes a chassis. An apparatus is coupled to the chassis and is configured to detachably hold at least one pipette tip. A drive apparatus is coupled to the chassis and is configured to displace a displacement element to suck liquid specimens into the pipette tip and eject the specimens from the pipette tip. A tubular pipette housing is configured to surround and connect to the chassis. The longitudinal direction of the chassis is aligned in the longitudinal direction of the pipette housing. The chassis includes multiple chassis elements which are arranged behind one another and are connected to one another. The apparatus for detachably holding at least one pipette tip and the drive apparatus are connected to one or more of the multiple chassis elements.

A pipetting apparatus for aspirating and dispensing liquids having a pipetting unit with an interchangeable vessel that receives a liquid to be transferred, a holder for the pipetting unit, a positioning device for the pipetting unit, a micrometering unit, and an electronic control device. The micrometering unit is embodied separately from the pipetting unit and has a separate electronic control unit. The pipetting unit has a coupling device and the micrometering unit has a counterpart coupling device that matches the coupling device for the purpose of coupling. Coupling device and/or counterpart coupling device is/are switchable. The holder or the micrometering unit has a contact device with at least one electrical contact element and the micrometering unit or the holder has a counterpart contact device, matching the contact device, with at least one counterpart electrical contact element for making electrical contact with the contact element.

A device for locking a volume adjustment screw for a pipetting system, comprising a control member which rotates as one with a position selector, the member cooperating with a locking wheel such that: when the selector is in the free adjustment position, the member ensures that the wheel is axially spaced from another wheel, such that the teeth of the wheels do not cooperate with each other; when the selector is in the fine adjustment position, the member allows the wheel to move away from and then to move axially towards the other wheel while transitioning from one tooth to another; when the selector is in the locking position, the member axially locks the wheel to prevent the teeth from being disengaged.

A pipette with an adjustable dosing increment, wherein a control apparatus determines a dosing volume by a set dosing increment when a syringe is inserted in the pipette, and determines a maximum possible number of dosing steps following an execution of a reverse stroke without refilling the syringe given the set dosing increment and completely or partially filled syringe by the position of a displacement means on the path, and displays the maximum number of dosing steps on a display apparatus until the reverse stroke is executed. The control apparatus also determines the number of executed dosing steps and displays the number of executed dosing steps and/or the number of dosing steps still possible without refilling the syringe on the display apparatus.

A pipetting device for taking up and dispensing fluid volumes has a displacement device with a displacement mechanism and a displacement housing. The pipetting device has an adjusting device for changing the stroke of the displacement mechanism. The stroke of the displacement mechanism can be adjusted, and the corresponding adjustment value can be displayed by an adjustment indicator. A coupling device, in a use state, couples the adjusting device to a volume indicator and decoupled the adjustment device from the adjustment indicator. In an adjustment state, the adjusting device is coupled to the adjustment indicator and is decoupled from the volume indicator. The adjustment indicator displays an adjustment value for the stroke of the displacement means. The adjustment indicator can be adjusted in an adjustment state, whereas it is fixed in a use state.

A pipette calibration and volume offset mechanism. The calibration and volume offset mechanism is provided to facilitate user selectable calibration or volume offset operations of a pipette to which the calibration and volume offset mechanism is installed, through axial displacement of a threaded element that effectively moves the home position of the pipette. An offset counter of the calibration and volume offset mechanism is rotationally coupled to the threaded element during a volume offset operation to indicate offset magnitude, but decoupled from threaded element during a calibration or recalibration operation.

Multivolume liquid pipettes with nested plunger and vacuum chamber configurations and methods of using such pipettes are disclosed herein. These pipettes typically include a body and a fluid displacement assembly with a small plunger element slideably received within a larger plunger element, each movable within a vacuum chamber for the precise and accurate control of the displacement of fluid, such as air. In turn, this allows for a single device to aspirate and dispense a broad range of liquids in a dynamic, accurate, and precise manner. In addition, the devices disclosed herein may also include a multi-tiered spring-loaded ejection mechanism to allow the user to use and eject pipette tips of different sizes.

A pipette with an adjustable dosing volume comprises a housing connected to at least one seat configured to releasably hold a pipette tip. A displacement device is positioned within the housing and configured to aspirate and discharge liquid from the pipette tip. A stroke rod is coupled to the displacement element and configured to be longitudinally displaced relative to the housing to displace the displacement device. A catch sleeve is rotatably mounted within the housing and is connected to the stroke rod. An adjusting sleeve configured to engage a transducer shaft that is rotatably mounted within the housing and comprises a countershaft of a gearbox that is configured to be shifted between different shift stages. Each shift stage comprises different gear ratios between a rotational speed of the adjusting sleeve and a rotational speed of the catch sleeve. The different gear ratios enable coarse volume adjustment and fine volume adjustment.

Multivolume liquid pipettes with nested plunger and vacuum chamber configurations and methods of using such pipettes are disclosed herein. These pipettes typically include a body and a fluid displacement assembly with a small plunger element slideably received within a larger plunger element, each movable within a vacuum chamber for the precise and accurate control of the displacement of fluid, such as air. In turn, this allows for a single device to aspirate and dispense a broad range of liquids in a dynamic, accurate, and precise manner. In addition, the devices disclosed herein may also include a multi-tiered spring-loaded ejection mechanism to allow the user to use and eject pipette tips of different sizes.

A pipette comprises a pipette housing, a neck configured to clamp on a pipette tip, and a drive apparatus. The drive apparatus comprises a drive element configured to displace a displacement element to draw a liquid sample into the pipette tip and to eject the liquid sample from the pipette tip. A scanning apparatus comprises a scanning element positioned proximate the neck and configured to be displaced relative to the pipette housing by a collar of the pipette tip when clamping the pipette tip onto the neck. A mechanical display apparatus is coupled to the scanning apparatus and comprises a display. When the pipette tip is clamped to the neck the scanning apparatus is configured to adjust the display depending on a height of the collar of the pipette tip relative to the neck, and the neck is configured to accommodate different collar heights.