Method and apparatus for accurate positioning of a pipetting...

Details Method and apparatus for accurate positioning of a pipetting... Method and apparatus for accurate positioning of a pipetting...

G - Physics

01

N

G01N 35/10 (2006.01) B01L 3/14 (2006.01) G01N 35/02 (2006.01)

Patent

CA 2560459

A method for determining a reference position for a pipetting needle which is part of an automatic analytical apparatus. The method comprises the following steps: (i) a first measuring step for measuring a first displacement error (.DELTA.X) in a displacement of the pipetting needle (72) effected by a transport device, (ii) a first correcting step for correcting the first displacement error (.DELTA.X) by means of a corresponding correction of an angular error (.phi.) of the initial angular position of the pipetting needle, (iii) a second measuring step for measuring a second displacement error (.DELTA.Y) in a displacement of the pipetting needle in a second direction (Y-axis) perpendicular to the vertical plane, (iv) a second correcting step for correcting the second displacement error (.DELTA.Y) by means of a corresponding change (.alpha.) of the angular position of the pipetting needle along a circular path, (v) a third measuring step for determining the position of a vertical reference line, and (vi) a fourth measuring step for determining the position of a reference point ((X0, Y0, Z0) along said reference line,

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