FIELD: measuring equipment.SUBSTANCE: invention relates to measuring device for measuring flow rate of fluid flowing in the direction of main flow in circular line. Device comprises inlet for guiding fluid from circular line to measuring device; outlet for directing fluid from meter to circular line; measuring part for connecting input part with output part; at least one ultrasonic device for emitting and / or receiving ultrasonic waves, the ultrasonic device being located on the wall of measuring part; and processing unit for performing measurement of difference in transit time and for determining the flow velocity, while the input part has the first superelliptic transitional form, output part has second superelliptic transitional shape, and measuring part has rectangular shape, in particular, with rounded corners.EFFECT: improving quality of flow measurement.7 cl, 5 dwg
