Pipetting device and method therefore
US5499545A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 14, 1994 |
| Grant date | Mar 19, 1996 |
| Priority date | — |
| Expiry date | Jun 14, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2035/1025
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Measurement accuracy is improved by eliminating the influence of changes in the atmospheric and internal pressures on the quantity of a liquid absorbed or discharged. A pipetting device inducts a specified quantity of liquid into a tip portion or discharges a specified quantity of liquid from the tip portion by controlling the pressure inside a cylinder portion including a cylinder and a piston. A control target value for the quantity of the liquid to be absorbed or discharged from a command portion and information from an atmospheric pressure measurement portion and a pressure sensor for detecting the internal pressure of the cylinder are sent to a correction calculation portion which in turn performs correction calculation based on measured data on the atmospheric and internal pressures and data on the shapes of the cylinder and tip portion to obtain the distance to be traveled by the piston so that the control target value form the command portion is met. A control portion controls a motor which drives the piston in accordance with information on the distance to be traveled by the piston from the correction calculation portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.