Abstract: The flow meter for one of a liquid and a gaseous medium comprises a casing and a measuring insert which is insertable into said casing. The measuring insert as a structural unit includes at least one first sound transducer for emitting a first sound signal into a measuring path through which the medium flows during operation and a second sound transducer for receiving the first sound signal after passing through the measuring path, the measuring path through which the medium flows during operation when the measuring insert is inserted, at least one end plate which seals a casing opening of the casing into which the measuring insert is insertable in such a way as to prevent an escape of the medium and which is provided with at least one of the two sound transducers, and at least one outer transducer cover which covers at least one of the two sound transducers on an outside of the end plate remote from the medium. A seal is arranged between the transducer cover and the end plate.

Abstract: The flow meter for one of a liquid and a gaseous medium comprises a casing and a measuring insert which is insertable into said casing. The measuring insert as a structural unit includes at least one first sound transducer for emitting a first sound signal into a measuring path through which the medium flows during operation and a second sound transducer for receiving the first sound signal after passing through the measuring path, and the measuring path through which the medium flows during operation when the measuring insert is inserted. The measuring path has an actual measuring channel comprising a measuring channel inlet opening for the medium, a measuring channel outlet opening for the medium and at least one measuring channel wall, wherein the measuring channel wall at least partly surrounds the measuring path in the direction of flow, and the casing has a casing wall, and a constriction is provided in an intermediate region between the measuring channel wall and the casing wall.