Patent ID: 7585468
Filing Date: 2009-09-08
Classification: B01L

Abstract:
1. Electronic pipette with a displacement device ( 1 ), an electric drive motor ( 5 ) with a drive shaft ( 6 ), a gear mechanism ( 7 to 10 ) coupled on the one hand to the displacement device ( 1 ) and on the other hand to the drive shaft ( 6 ), a magnetic disc ( 11 ) rotationally coupled to the drive shaft ( 6 ) with at least one magnetic pole ( 12 , 13 ) on the circumference, at least one magnetic sensor ( 14 , 15 ) aligned with the circumference of the magnetic disc ( 11 ), at least one additional magnet ( 16 ) aligned with the circumference of the magnetic disc, an electronic control device ( 17 ) electrically connected to the electric drive motor ( 5 ) and the magnetic sensor ( 14 , 15 ) and an electric voltage supply ( 18 ) connected to the electronic control device ( 17 ).