Patent ID: 7130027

Claim:
An analytical system for reflectometric analysis of an analyte in a sample liquid comprising: a test strip provided with a test field for application of the sample liquid wherein the test field including the applied sample liquid has a target surface; a measuring head arranged at a distance from the target surface, wherein the measuring head comprises a source for radiating the target surface and a detector for measuring radiation reflected by the target surface; an optical triangulation unit for detecting the distance between the measuring head and the target surface, wherein the triangulation unit comprises a light emitter directed towards the target surface in an incidence axis and a light receiver pointing towards the target surface in the direction of a receiving axis and wherein the incidence and receiving axis intercept at a reference point; and a control device for adjusting the distance between the measuring head and the target surface to a predetermined value, thereby permitting accurate analysis of the analyte by the measuring head.