Air Displacement Pipette

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A vacuum is generated by the vertical travel of a metal or ceramic piston within an airtight sleeve.

Air displacement pipette.

Unlike an air displacement pipette which dispenses liquid using an air cushion in the pipette tip the piston in a positive displacement pipette makes direct contact with the sample allowing the aspiration force to remain constant. When using positive displacement pipettes there is no elastic air space to expand or contract so the aspiration force remains constant unaffected by the physical properties of the sample. The liquid s density influences the size of air cushion e g. These pipettes operate by piston driven air displacement.

Getting down to the basics an air displacement pipette is a common laboratory tool used to handle a measured volume of liquid between 1 µl to 1000 µl 1 ml. Zeus is equipped with anti droplet control adc. However conditions such as temperature atmospheric pressure as well as the specific gravity and viscosity of the solution may have an effect on the performance of air displacement pipettes. Air displacement pipette used for standard pipetting applications is highly accurate.

Positive displacement pipettes are a type of pipette that operates via piston driven displacement. In air displacement pipettes a certain volume of air remains between the piston and the liquid. When enabled the pressure is monitored in the tip. Volatile liquids like acetone and methanol can be extremely difficult to pipette using air displacement.

Adjust pipette to liquid becomes fixed volume pipette for adjusted volume. Laboratory pipettes can function either via air displacement or by positive displacement principles. Acids bases and solvents are the worst enemies of any air displacement pipette. Too low too high volume is pipetted.

No air cushion therefore no problem. Both pipette types have a piston that moves in a cylinder or capillary. Due to its high accuracy this laboratory tool is commonly used in standard pipetting applications. In positive displacement pipetting the piston is in direct contact with the liquid.

In an air displacement pipette an air cushion separates the liquid in the plastic tip from the piston inside the pipette.

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