Ultrasonic measuring device and a method for the ultrasonic measurement on a flowing fluid

An ultrasonic measuring device for the measurement of a fluid flowing in a pipe, comprising:

• a closable housing having a continuous central recess, which has a longitudinal extension defining a flow direction, the housing configured to releasably attach to the pipe such that, in a closed state of the housing, the central recess receives the pipe and fixes the pipe with respect to the housing, so that the fluid is capable of flowing through the central recess in the flow direction;
• and
• at least four ultrasonic transducers disposed in the housing for respective emitting and receiving of ultrasonic signals, at least two first ultrasonic transducers of the at least four ultrasonic transducers are arranged laterally on a first side of the central recess in the closed state of the housing, and at least two second ultrasonic transducers of the at least four ultrasonic transducers are arranged laterally on a second side of the central recess in the closed state of the housing, the second side opposed to the first side so that the recess is disposed between the first two first ultrasonic transducers and the second two first ultrasonic transducers, the ultrasonic transducers arranged and aligned such that in each a first ultrasonic transducer of the first two first ultrasonic transducers is configured to emit a first measuring signal to a second ultrasonic transducer of the second two first ultrasonic transducers obliquely to the flow direction and configured to receive a second measuring signal emitted by the second ultrasonic transducer obliquely to the flow direction, and at least one ultrasonic transducer of the at least four ultrasonic transducers being arranged and aligned to receive a measuring signal progressing perpendicular to the flow direction.