Patent ID: 7373839

Claim:
An apparatus for determining and/or monitoring the volume- and/or mass-flow of a medium flowing through a pipeline and defining a stream direction, the pipeline defining an outer wall, comprising: at least two ultrasonic sensors, which are secured in a defined measuring positional relationship on the outer wall of the pipeline and which alternately emit and receive ultrasonic measuring signals; and a control/evaluation unit connected to said at least two ultrasonic sensors, which determines volume- and/or mass-flow of the medium in the pipeline on the basis of a travel time difference of the ultrasonic measuring signals in the stream direction and opposite to the stream direction, wherein: said at least two ultrasonic sensors are secured on a pliers-like clamping unit, which is embodied in such a manner that said at least two ultrasonic sensors are brought into a measuring positional relationship by clamping onto the outer wall of the pipeline.