Patent ID: 6906802

Claim:
A system for analyzing sample liquids by evaluating test elements with an analytical unit in which a test element to be analyzed is positioned by a holder in an analytical position relative to the analytical unit, the system comprising, a position control unit to check whether an analytical area of the test element is correctly positioned relative to the analytical unit wherein the position control unit comprises: (a) a light source to irradiate an area of the test element, (b) a detector to detect light reflected from the area, and (c) an evaluation unit, wherein the light source and detector are positioned relative to one another in such a manner that the light intensity of specularly reflected radiation from the test strip at the detector when the test element is correctly positioned is different from the light intensity of reflected radiation from the test element at the detector when it is incorrectly positioned, and the evaluation unit is adapted to recognize any faulty positioning on the basis of the light intensity at the detector.