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Positive Displacement Pipette

New and Refurbished Positive Displacement Pipettes are Available. 

 

What are postive displament pipettes?

  • Positive-displacement pipettes work like a syringe. The samples come into direct contact with the tip and piston, increasing precision and accuracy and eliminating the air cushion.   The direct contact with samples results in the aspiration force remaining constant.

Positive displacement pipettes are recommended for:

  • Viscous and dense liquids
    • Samples are aspirated and dispensed more slowly than water in a traditional air cushion pipette, which can lead to inaccurate volumes and residue attached to the tip wall.  Syringe/ Piston tips wipe the tip walls clean.
    • Liquid examples: Tween™ 20, sulfuric acid, concentrated DNA / RNA, glycerol
  • Volatile liquids
    • Evaporation can lead to inaccuracy and the pipette dripping in traditional air-cushion pipettes, positive displacement pipettes prevent vapors from moving into air space.
    • Liquid examples: acetone, ethanol, methanol
  • Radioactive, infectious, and corrosive liquids
    • Positive displacement pipettes prevent aerosolization of solutions into an open-air space.
    • Liquid examples:concentrated sulfuric acid, concentrated hydrochloric acid, biological samples, Iodine-125
  • Detergent containing/ foaming liquids
    • Sealing of piston with the tip wall reduces foaming and bubble formation.
    • Liquid examples: serum, SDS, Mucasol™

Additional Informaiton:

Biomaster PCR Positive Displacement Pipette


Contamination-free pipetting with the Biomaster: The Biomaster from Eppendorf is an adjustable pipette for the volume range 1-20 µl. It functions according to the positive-displacement principle in conjunction with the special Mastertip. The formation of aerosols, which is a common cause of contamination (e.g. during amplification of nucleic acids) is thus completely eliminated.
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Transferpettor Positive Displacement Pipette


The Transferpettor Positive Displacement Pipette is the best tool for many liquids that render traditional air-displacement pipettes ineffective. 
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Gilson Microman Pipette


Gilson’s Microman is a fully-adjustable, positive-displacement pipette that, together with its disposable Capillary Pistons (CPs), will assure accuracy and precision—even with problem liquids. Six models cover a wide range of volumes from 1 µL to 1000 µl.
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Rainin Pos-D Positive Displacement Pipette

Rainin Pos-D Positive Displacement Pipette


Pos-D Positive Displacement Pipette is a positive-displacement pipette with ergonomic benefits. Made in USA. Eliminates aerosol contamination. Pre-assembled capillaries & pistons in racks eliminate sample carryover, isolate samples from pipette body. 1 - 1000 uL.
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Socorex Dosys Laboratory Syringes


From the basic unit to the corrosion resistant model, the laboratory dedicated glass and metall syringe line offers precision instruments you can trust. Intended for safe and reliable liquid distribution, the selection includes: Two ring syringes where vertical working position is best suited for repeat dosing in narrow tubes or wells. Pistol grip syringes where hand activation allows longer ...
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Positive Displacement Digital Microdispenser


Microdispenser directs digital set and readout for fractional microliters, positive lock prevents accidental volume changes. Repeat Kit is available for Model 590 and 390.
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Drummond Dialamatic Microdispensers


Adjustable direct reading plunger sets volume with delivery scale engraved on plunger shaft.
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Acura® 841 Capillary Positive Displacement Micropipette

Acura® 841 Capillary Positive Displacement Micropi


Pipette with ETFE tipped plunger provides for positive displacement of the sample in a precision capillary tube. Optimal accuracy and reproducibility when pipeting high density, viscous, foaming or volatile liquids. Five models cover a range from 1 to 200 µL. Features include: Step-wise volume adjustment ; Interchangeable plunger and glass capillary ; Matching colour codes on pipette, ...
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Drummond Fixed Volume Microdispensers

Drummond Fixed Volume Microdispensers


Custom spacers available permitting fractional deliveries on all units with overall volumetric accuracy of ±1% (at full volume). 
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Drummond PCR Pipets


Drummond PCR disposable positive displacement micropipets with stainless steel plungers. 
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Drummond Wiretrol® I & II


Drummond Wiretrol disposable precision bore calibrated micropipet and a stainless steel plunger with fingertip handle, for both high and low viscosity liquids including corrosives. 100 glass micropipets and 1 reusable plunger
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Drummond Microcaps®


Drummond Microcap precision-bore glass capillary tubes are a fast, safe, clean, and accurate way to transfer liquids in micro quantities. 
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