Abstract: The invention relates to a pipette for transferring liquids, comprising the following: at least one piston-cylinder arrangement (3, 4), in which the cylinder (4) is arranged in such a way that it can be provided with a replaceable tip (8) for containing the liquid to be transferred; a piston actuating device (5) for drawing up and discharging the liquid; and a tip ejector device (6). Said ejector device comprises an ejection mechanism (16, 16′) which can be displaced along the cylinder in order to eject a tip (8) from the end of said 24 cylinder. A device (17) for actuating the ejection mechanism is also provided. The invention is characterized in that the ejector device (6) comprises a device for adjusting position (24, 24′, 33, 33′, 39, 39′), which is arranged in such a way that it is possible to modify the limit position reached by an ejection end (22, 22′) of the ejector device at the end of a stroke.

Abstract: A proportioning device, comprising a manually operable actuating device, a sensor associated with the actuating device for detecting a force manually exerted on the actuating device, an electric driving motor, an electric control connected to the sensor and electric driving motor for controlling the driving motor during the detection by the sensor of a force exerted on the actuating device, an electric voltage supply connected to the sensor, electric driving motor, and electronic control, and a displacement device coupled to the actuating device and electric driving motor for proportioning a liquid.

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: The sampling pipette includes means (6, 12, 38, 5) for adjusting the volume of liquid to be taken. It includes a locking element (8) that is movable between an inactive position in which it makes the adjustment means unsuitable for performing adjustment and an active position in which it makes the adjustment means suitable for performing adjustment.

Abstract: A pipetting device for detachably mountable pipette tips, comprising a moving device, a piston movable by the moving device in a cylinder to displace a column of air, an attachment stem for mounting a pipette tip, with an aperture having a connection to the cylinder at the free end, two stops limiting the movement of the piston during the displacement of the column of air, one of which is dislocatable, a precise adjustment device for dislocating the dislocatable stop in parallel with the piston for a precise adjustment of the piston stroke, a coupling device which puts the precise adjustment device into function, when coupled, and puts it out of function, when uncoupled, a rough adjustment device for dislocating the dislocatable stop when the precise adjustment device is uncoupled, for a rough adjustment of the piston stroke, and a measuring and indicating device coupled to the dislocatable stop for measuring the position set for the dislocatable stop and indicating the proportioning volume that matches the p

Abstract: An ergonomic, manually precisely controllable return springless air displacement pipette relying upon the friction of a piston seal to maintain a plunger unit of the pipette in any axial location established by a user of the pipette.

Abstract: A present micro array manufacturing apparatus includes a substrate placement portion 11 on which a plurality of substrates can be arranged, a tighter plate 12 for storing a solution including a living body sample, a solution storing member 52 for taking in the solution from the tighter plate 12 and storing the solution therein, and a needle 51 which can be inserted into the solution storing member 52 to allow the solution stored in the solution storing member 52 to adhere onto each of the substrates by a given quantity, wherein the solution storing member 52 and needle 51 are moved in directions where they approach and part away from the substrates to thereby form spots on the substrates. And, the individual operations of the solution storing member 52 and needle 51 are carried out by single drive means 32.

Abstract: The accurate determination of the presence of a fluid in a container is determined by assessing the difference in various pressure readings relative to a threshold value. The method distinguishes between actual aspiration of a fluid and aspiration of a film that can otherwise lead one to believe that fluid has been aspirated when it has not. The method is particularly useful in clinical analyzers such as automated enzyme immunoassay devices.

Abstract: A pipetting system including a syringe (2), a working piston (5) connectable with the syringe piston (24) and extending into a working chamber (3), an actuating piston (7) extending into the working chamber, and a storage chamber (4) connected with the working chamber (3) by a valve (12) that provides for flow of the hydraulic liquid, which fills both chambers, from the working chamber (3) into the storage chamber when the working piston (5) is displaced into the working chamber (3), for flow of the hydraulic fluid from the storage chamber (4) into the working chamber (3) when the actuating piston is displaced out of the working chamber, and that separates the storage and working chambers (3, 4) when the actuating piston (7) is advanced into the working chamber.

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 volume adjustable manual pipette having a hand-holdable housing supporting (i) an electronic digital display and associated position sensing and control circuitry, (ii) a plunger unit and (iii) a quick set volume adjustment mechanism for simultaneously controlling the volume setting of the pipette and the electronic display, the quick set volume adjustment mechanism comprising a pipette volume setting member for limiting upward movement of the plunger unit within the housing to define the volume setting for the pipette and the volume setting member being supported for axial movement on the plunger unit and releasably secured relative to the housing by a pipette user operable locking mechanism. When released from the housing, the volume setting member is axially moveable on and with the plunger unit to quickly set the volume for the pipette.

Abstract: Hand-held pipettes are provided which have automatic volume setting and either manual or power assisted piston operation. Power assisted piston operation may be achieved with a fly-by-wire operation wherein movement of a plunger button is detected and used to control a drive for the plunger. A data transfer capability in at least one direction may also be provided for the pipette.

Abstract: An ergonomic, manually precisely controllable return springless air displacement pipette relying upon the friction of a piston seal to maintain a plunger unit of the pipette in any axial location established by a user of the pipette.

Abstract: The invention relates to a pipette comprising a housing, said housing comprising a suction chamber, said suction chamber provided with a movable piston, an adjustable, threaded retainer mechanism for retaining the piston's motion, said retainer mechanism being provided with a range adjustment threading, and a calibration mechanism for the motion of the piston. In addition, the pipette includes another adjustable, threaded retainer mechanism for retaining the motion of the piston, said retainer mechanism being provided with a fine adjustment threading with a pitch that is smaller than that of the range adjustment threading of the first retainer mechanism. According to the invention, the volume is adjusted rapidly and still accurately.

Abstract: A blowout springless manual air displacement pipette including a mechanical assist for generating a mechanical force opposing a return spring force on a plunger unit to aid a pipette user in locating and maintaining the plunger unit at a “home” position within a pipette body and ready for immersion of a pipette tip in a liquid to be drawn into the tip.

Abstract: An ergonomic, manually precisely controllable return springless air displacement pipette relying on the friction of a piston seal to maintain a plunger unit of the pipette in any axial location established by a user of the pipette.

Abstract: Hand-held pipettes are provided which have automatic volume setting and either manual or power assisted piston operation. Power assisted piston operation may be achieved with a fly-by-wire operation wherein movement of a plunger button is detected and used to control a drive for the plunger. A data transfer capability in at least one direction may also be provided for the pipette.

Abstract: A bilaterally symmetrical lightweight hand holdable battery powered microprocessor controlled electronic pipette including an axially elongated hollow housing having a vertically extending longitudinal axis. An upper portion of the housing includes a forward compartment containing a forwardly facing alpha-numeric display, a plurality of columns of forwardly facing control keys and plurality of forwardly facing trigger switches arranged in a vertically spaced pattern such that a user in gripping a lower handle portion of the housing in either his or her right or left hand can easily reach with his thumb the control keys, trigger switches as well as a push button of a pipette tip ejector.

Abstract: An adjustable pipette includes a body containing a plunger assembly including a thumb button that is axially moved in alternating relatively shorter sample aspirating and relatively longer dispensing strokes. Guide slots in a guide sleeve receive a stop pin carried by a plunger shaft, and the slots define two axially and circumferentially spaced lower stops for aspirating and dispensing strokes respectively. The thumb button includes offset lobes that apply a rotational torque to the plunger shaft when pressed by the user. The user presses one lobe for an aspirating stroke to rotate the plunger shaft in one direction and align the stop pin with uppermost lower stops for a relatively short aspirating stroke and the user presses the other lobe for a dispensing stroke to rotate the plunger shaft in the other direction and align the stop pin with lowermost lower stops for a relatively long dispensing stroke.

Abstract: A freely traversable metering head with numerous metering devices, wherein the metering devices are each provided individually or block-by-block with an activating device, and wherein a controller traversable with the metering head is designed for the independent operation of one or more activating devices. Metering devices for such a metering head and procedures for their use are also disclosed.

Abstract: A pipette dispensing block has an improved piston seal and lift plate engagement/disengagement means. In a pipette dispensing block where a piston is used to create a pressure differential to aspirate or extract and dispense or eject fluid material, the maintenance of a vacuum or increased pressure is enhanced by a pair of O-ring seals engaging the piston. A reservoir separates the O-rings and is filled with a low vapor pressure lubricant such as silicone oil or grease. The lubricant is maintained in the reservoir by the O-rings and serves to enhance the vacuum seal while maintaining the O-rings in a pliable and resilient manner. The heads of the pistons are engraved or grooved to leave a circular central pillar surrounded above and below by the piston head and a lower intermediate piston pillar section.

Abstract: A battery powered, microprocessor controlled portable electronic pipette, comprising a hand holdable housing supporting a battery, a linear actuator for driving a plunger lengthwise in a cylinder to aspirate and dispense fluid into and from a pipette tip extending from the housing and a control circuit for the linear actuator. The linear actuator is powered by the battery and comprises a stepper motor with current receiving windings for electromagnetically driving a rotor to impart the lengthwise movement to the plunger.

Abstract: The present invention relates to an electrically monitored mechanical pipette which includes a microswitch in its volume delivery adjustment mechanism which operates to signal the electrical volume monitoring system of the pipette when a fluid volume delivery setting adjustment is being made. In this manner, the pipette operates in a low power mode during normal operation to display the present fluid volume delivery setting, but moves to a high power consumption mode when changes are being made to the fluid volume delivery setting. The microswitch allows the high power consumption elements in the electronic volume monitoring system, such as a Hall-effect transducer assembly, to be inactive and receive no power input until it is needed during adjustment of the fluid volume delivery setting.