Abstract: A method calculates the boundary layer level between fluids, in particular the boundary layer level between oil and water in connection with the use of a segment-based boundary layer meter. The calculations are based on the use of measurement signals from a number of segments, n, and the boundary layer level, L, of the water is calculated as follows: L = ? _ - ? 0 ? v - ? 0 ? ( L u - L l ) + L l where: Lu Upper water range area Ll Lower water range area ?n Density of segment no. n from the profile meter {circumflex over (?)}n Corrected density for segment no. n ? Calculated mean density ?v Mean density of water from the profile meter ?o Mean density of oil from the profile meter N Total number of segments included.

Abstract: A method for calculating the boundary layer level between fluids, in particular the boundary layer level between oil and water in connection with the use of a segment-based boundary layer meter. The calculations are based on the use of measurement signals from a number of segments, n, and the boundary layer level, L, of the water is calculated as follows: L = ? _ - ? 0 ? v - ? 0 ? ( L u - L l ) + L l where: Lu Upper water range area (*) Ll Lower water range area (*) ?n Density of segment no. n from the profile meter {circumflex over (?)}n Corrected density for segment no.