System and method for improved measurement of a flow of fluid through a channel

A flow measurement system comprising an ultrasonic flowmeter for measuring a flow of fluid through a channel, wherein the channel has an axial extension determining a flow direction of the fluid and a cross section characterizable by at least one characteristic parameter, the ultrasonic flowmeter comprising at least two ultrasonic transducers that are arranged at a distance from each other, when the ultrasonic flowmeter is fixed to the channel, and that are configured to emit ultrasonic pulses into the channel and to receive ultrasonic pulses in the channel, the ultrasonic flowmeter further comprising a processor connected to the two ultrasonic transducers,

• wherein the at least two ultrasonic transducers are arranged to emit and receive ultrasonic pulses, and the processor is configured to measure transit times of the ultrasonic pulses in the channel in such a manner that a flow velocity of the fluid and the one or more characteristic parameter(s) of the channel are determined by using the transit times.