Patent ID: 7523677

Claim:
An apparatus for ascertaining and/or monitoring volume- or mass-flow of a medium flowing through a pipeline directed along the longitudinal axis of the pipeline, comprising: at least one ultrasonic sensor, which includes at least one sound-producing element and an interfacing shoe and which radiates ultrasonic measurement signals into, respectively out of, the pipeline at an incidence/emergence angle; a first adjusting mechanism, which is embodied in such a manner that the incidence/emergence angle of said at least one ultrasonic sensor is adjustable in predetermined limits; and a control/evaluation unit, which ascertains volume- or mass-flow of the medium in the pipeline by one of: the travel-time difference method, the cross-correlation method and the Doppler method, wherein said interfacing shoe comprises a first subcomponent and a second subcomponent; said first subcomponent is an essentially rotationally symmetric element, with which said sound-producing element is connected; said second subcomponent has a corresponding cavity; and said first subcomponent is rotatably seated in said corresponding cavity.