Patent ID: 6281517
Filing Date: 2001-08-28
Classification: G01N

Abstract:
An apparatus for monitoring pipetting of a first liquid from a pipetting needle having a tip immersed in a second liquid, said apparatus comprising:a light source having a light beam to irradiate the second liquid;a light receiver for receiving the light beam emerging from the second liquid wherein said light receiver is adapted for continuously delivering intensity signals (U.sub.n);an output signal emitted by the light receiver corresponding to the received light intensity,first storage means for storing previously determined threshold values (S);second storage means for storing the intensity signals (U.sub.n)delivered by the light receiver and evaluation parameters (B.sub.m and A.sub.m /A.sub.tot) derived therefrom; andat least one logic circuit for comparing said evaluation parameters (B.sub.m and A.sub.m /A.sub.tot) with said threshold values (S) and for delivering a resulting output signal (E and F).