Ultrasonic measurement apparatus and method for measuring the flow velocity of a fluid

Use of an ultrasonic measurement apparatus (10) as a gas counter at a gas pipeline, said ultrasonic measurement apparatus (10) having an ultrasonic measurement zone (36) with at least a pair of ultrasonic transducers (38), an evaluation unit for determining the flow velocity from a propagation time difference of ultrasound transmitted and received with and against the flow, as well as a deflection unit, by means of which the fluid from the main flow direction is deflectable and suppliable to the ultrasonic measurement zone (36), wherein the deflection unit (20, 26, 32) forms a loop.

A method for measuring the flow velocity of a fluid which flows in a pipeline in a main flow direction, wherein the flow velocity is determined from a propagation time difference of ultrasound transmitted and received with and against the flow from a pair of ultrasonic transducers (38) in an ultrasonic measurement zone (36), wherein the fluid is deflected from the main flow direction and supplied to the ultrasonic measurement zone (36) for the measurement, wherein the ultrasonic measurement takes place whilst the fluid is deflected such that it flows in a loop.