The precise ultrasonic flow sensor SONOFLOW IL.52 detects smallest flow rates of liquids quickly, using bidirectional measurement. Due to its construction and its resistance to temperature, the sensor is particularly suitable for applications in fields with strict hygienic standards. An additional benefit is, that the sensor is wear- and maintenance free. The SONOFLOW IL.52 is constructed as a built-in component for machines and apparatus. The mechanical installation and electrical integration into the control system can be carried out easily. The sensor has two current outputs or pulse outputs respectively. The service interface allows an easy parameterization, calibration and readout of measuring values.