Patent ID: 6740295
Filing Date: 2004-05-25
Classification: B01L,G01F,G01N

Abstract:
A method for detecting the type of replaceable piston-cylinder unit mounted in a pipetting or dosing apparatus by sampling of a code marking on a free end of a head of a piston rod of the piston-cylinder unit w1114 a detection device of the apparatus, comprising the steps of:a) inserting the piston-cylinder unit in the apparatus; b) mounting the cylinder of the piston-cylinder unit in the apparatus; c) coupling the piston rod head with the apparatus; d) detecting the presence of the piston-cylinder unit in the apparatus; and, following the above mentioned sequence of steps comprising the steps of:e) generating a relative movement between the piston rod head and the detection device and detecting a reference point on the piston head with the detection device; and f) generating a relative movement between the piston rod head and the detection device and detecting a code marking on the piston rod head to determine the type of piston-cylinder unit mounted in the apparatus; wherein the steps e) and f) occur in any time sequence.