Integrated Pipetting Apparatus
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United States of America Patent
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Issued Date -
Jan 14, 2021
app pub date -
Apr 6, 2018
filing date -
Apr 6, 2018
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Abstract
A pipette module 10 has a pipette-module frame 12 attachable to the z-axis frame 120 of a liquid handling system 100. A translatory-motion frame 14 attached to the pipette-module frame 12 is movable with respect thereto by a motor 16. A pneumatic aspirator assembly 18 including a cylinder 20, tube 24, tube tip 26 and pressure sensor 28 is attached to the translatory-motion frame 14. A piston 22 disposed in the cylinder 20 is fixedly attached to the frame 12. A controller 30 for the pipette module 10 has a liquid surface detection mode which enables a pressure feedback control algorithm causing the motor 16 to move the translatory-motion frame 14 in a z-axis translator motion until a change in a pressure in the tip 26 as sensed by the pressure sensor 28 indicates that the tip 26 has made contact with the liquid surface 110.
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