The invention relates to a medical device for extracorporeal blood treatment comprising an extracorporeal blood circulation having at least one tube and at least two sensor units measuring on the tube with different operating principles, wherein portions of the tube are adapted to be coupled to the at least two sensor units for measurement. According to the invention, each sensor unit consists of a sensor-specific component and a sensor-neutral component, wherein the sensor-neutral components of the sensor units are formed to be identical whereas the sensor-specific components are different in response to the operating principle and comprise a respective specific sensor system. Furthermore, for each sensor unit a sensor-neutral component is mounted on a sensor-specific component, wherein when being introduced and fixed in a sensor-neutral component a portion of the tube is adapted to be coupled to the sensor system of the sensor-specific component located there beneath so that the sensor system can carry out a measurement at the tube.
