Ultrasonic transducer arrangement for a clamp-on ultrasonic flow measuring point and a clamp-on ultrasonic flow measuring point and method for commissioning the clamp-on ultrasonic flow measuring point

An ultrasonic transducer arrangement for a clamp-on ultrasonic, flow measuring point based on the travel time difference principle, the arrangement comprising:

• a plurality of ultrasonic transducers, each adapted to be arranged on an outside of a measuring tube wall of a measuring tube of the clamp-on flow measuring point, wherein each ultrasonic transducer includes at least one transducer element configured to generate and/or receive ultrasonic signals and a coupling element, wherein the coupling element includes a first contact area and a second contact area, wherein the at least one transducer element is arranged on the first contact area, and wherein each ultrasonic transducer is adapted to contact the measuring tube the respective second contact area,
• wherein each ultrasonic transducer is configured to radiate ultrasonic signals into the measuring tube and/or to receive ultrasonic signals emerging from the measuring tube,
• wherein the second contact areas each have a normal that defines a plane in which ultrasonic signal paths of the ultrasonic signals extend,
• wherein the plurality of ultrasonic transducers include a first group of adjoining first ultrasonic transducers arranged relative to a measuring tube longitudinal section on a first side of the measuring tube, and wherein the plurality of ultrasonic transducers include a second group of adjoining second ultrasonic transducers arranged relative to the measuring tube longitudinal section on a second side of the measuring tube opposite the first side,
• wherein each coupling element of the first ultrasonic transducers and of the second ultrasonic transducers have a longitudinal axis, wherein the longitudinal axis has, in each case, an interior angle at the corresponding second contact area, wherein the ultrasonic signal path extends in the coupling element in the direction of the longitudinal axis,
• wherein at least one first ultrasonic transducer is adapted to receive the ultrasonic signals of at least one second ultrasonic transducer and vice versa,
• wherein the adjoining ultrasonic transducers of the first group each have a first separation, A1, from each other, and wherein the adjoining ultrasonic transducers of the second group each have a second separation, A1, from each other, wherein the first separation and the second separation are unequal,
• wherein:
• 2*A1>=A2>=1.125*A1.