DEVICE FOR DETERMINING AND/OR MONITORING THE VOLUME AND/OR MASS FLOW RATE OF A MEDIUM

摘要

The invention relates to an ultrasonic flow measuring device (1) comprising at least one ultrasonic sensor (5: 6) and a control/evaluation unit (11) which is embodied in such a manner that it sends, receives and evaluates ultrasonic measuring signals at least in a first frequency range and in a second frequency range. The first frequency range is activated or can be activated when said medium (4) is a gaseous medium and the second frequency range is activated or can be activated when said medium is a liquid medium.