Importance

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Abstract

An ultrasonic measurement device (10) for determining a flow velocity of a fluid in a conduit comprises

a pipe section (12) having a central longitudinal axis (22) and a cross section (24) with a radius (R), the central longitudinal axis (22) defining a horizontal reference plane (26);at least a first two-path measurement system with a first path (30a) and a second path (30b) defined by a first pair of ultrasonic transducers (32) and a second pair of ultrasonic transducers (32) mounted to the wall of the pipe section (12), the ultrasonic transducers (32) of each path (30a-b) opposing each other at the ends of their path (30a-b), each path (30a-b) oriented parallel to the horizontal reference plane (26) with a distance to the horizontal reference plane (26) while having a component transverse to the central longitudinal axis (22);first evaluation means (38) to determine a first flow velocity value from the first path (30a) by comparing the ultrasonic transit times along the first path (30a) with and against the fluid flow and a second flow velocity value from the second path (30b) by comparing the ultrasonic transit times along the second path (30b) with and against the fluid flow; andfirst integration means (40) to determine the flow velocity from the first flow velocity value and the second flow velocity value.

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First Claim