It has been established that ultrasonic flow meters are influenced by thermal conditions. Physical properties of the flowing medium, such as viscosity and density, are influenced by temperature, and temperature gradients will thus influence the flow pattern, the question is exactly how. In order to get a clearer picture of the influence from temperature gradients SFI would like to pose the question of how the meter accuracy is influenced by a radial and longitudinal temperature gradient caused by a temperature difference between the flowing medium and the surroundings. This is a very relevant and important question to answer in this research paper since the specifications allow temperature differences in the range of 200K between the ambient and the flowing medium.
