Sensor apparatus and method for detecting the concentration and viscosity of the liquid

(57) Abstract: sensor device for detecting the concentration and viscosity of the liquid have been proposed, this device has a device consisting of at least two of the sensor base element, at least one of the respective sensor base element one can be wetted by the liquid, electrically in the sensor base element for detecting by forming a surface acoustic wave - has an acoustic transducer (6), the surface acoustic wave, the measurement interval from the propagation characteristics along, it is possible to determine the concentration and degree of viscosity of the liquid. At least one region of the sensor base element, parallel to the direction of propagation of surface acoustic waves, which extends within each measurement period, liquid traps for the liquid (17) is provided.