Patent ID: 7790438

Claim:
Analysis apparatus, comprising a) a sensor chamber with a sensor for detecting an analyte in a transport medium, b) an analyte feed chamber for receiving the analyte in the transport medium, c) a distributor in flow communication with the sensor chamber and the analyte feed chamber, and d) a control means for controlling a transport medium flow, wherein the distributor comprises: (c1) an annular channel with four connections arranged spaced apart from one another, characterised in that (c2) the distributor includes in each case a switchable isolating means between two adjacent connections, and the control means is configured to control the distributor in such a way that for the flushing, the transport medium is fed from the distributor to the sensor chamber without first passing through the analyte feed chamber, and for the measurement, the transport medium is fed from the distributor to the sensor chamber after passing through the analyte feed chamber.