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Pipetting syringes are hand-held devices that combine the functions of volumetric (bulb) pipettes, graduated pipettes, and burettes. They are calibrated to ISO volumetric A grade standards. A glass or plastic pipette tube is used with a thumb-operated piston and PTFE seal which slides within the pipette in a positive displacement operation ...
The corresponding pipette has the same color code, printed on the pipette. For special applications, there are filter-tips available. These tips have a little piece of foam plastic in the upper conus to prevent sample aerosols contaminating the pipette. In general, all tips are stored in 8 × 12 boxes for 96 pieces in an upright position.
A Serological pipette is designed for use as a blow-out pipette. A Serological pipette also has graduation marks, which start nearer the end of the tip. The pipette can be blown out by gravitational force or air pressure. Rubber bulbs attached to the end opposite the tip are commonly used to "blow out" any remaining solution.
(These are for Class A pipettes; Class B pipettes are given a tolerance of twice that for the corresponding Class A.) A specialized example of a volumetric pipette is the microfluid pipette (capable of dispensing as little as 10 μL) designed with a circulating liquid tip that generates a self-confining volume in front of its outlet channels. [3]
Plastic Pasteur pipettes. An eye dropper, also called Pasteur pipette or simply dropper, is a device used to transfer small quantities of liquids. [1] They are used in the laboratory and also to dispense small amounts of liquid medicines.
Move the pipette to the receiving vessel and dispense the liquid by gently pressing the pipette knob to the first stop (#3). Withdraw the tip from the liquid. Some liquid will remain inside the tip. The liquid remaining in the tip can be dispensed back into the original solution (#4) or thrown away. Release the pipette thumb to the ready ...
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Release the pipette knob slowly to the ready position. Do not remove the tip from the solution. Repeat this process (step 3 and 4) to rinse the tip until the interior wall of the tip is clear. Remove the tip from the solution. Press the pipette knob to the second stop, and completely empty the tip. Release the pipette knob to the ready position.
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