Device for determining or monitoring the volume and / or mass flow of a fluid medium in a pipeline

摘要

The invention relates to a device for determining and / or monitoring the volumetric and / or mass flow of a fluid medium (2), which flows through a pipeline in a flow direction (S), with a measuring tube (3) introduced into the pipeline, with at least two Ultrasonic sensors (4), which are each mounted in an opening in the wall of the measuring tube (3), wherein the ultrasonic sensors alternately transmit and receive ultrasonic measuring signals at a predetermined frequency along a measurement path inside the measuring tube (3) extending, and with a control / evaluation unit (5), the volume and / or the mass flow of the fluid medium (2) in the pipe or in the measuring tube (3) based on the transit time difference of the ultrasonic measuring signals in the flow direction (S) and against Determined flow direction (S), wherein an ultrasonic transducer (4) has a cup-shaped housing (7), the medium (2) facing end face Durc h a membrane (8) is closed, wherein at least one electromechanical ultrasonic waves generating and receiving transducer element (9) on the inner surface of the membrane (8) is arranged. The ultrasonic transducer (4) is arranged by means of a sleeve-shaped adapter (10) in the opening (6) of the wall of the measuring tube (3) and configured and / or fixed in the wall, that the duration of structure-borne sound waves extending between the two Spread ultrasonic transducers (4) over the wall of the measuring tube (3) and / or the pipe, is different from the duration of the sound waves on the measuring path (MP) and / or that the structure-borne sound waves are attenuated in at least one predetermined frequency range.