Ultraflux UF 831 CO/RV enable to measure the flow of free-surface, open channels, sewers, rivers and partially filled pipes. To measure this flow a combination of velocity and level measurements are required. UF 831 CO/RV use transit time ultrasonic principle to measure velocity. UF 831 CO/RV measures the flow rate by integrating the hydraulic profile from 1 to 8 velocity chords which can be dispatched on up to 8 channels (depending on the model you choose) up to 500 m width.