For successful flow measurement, maintaining accuracy is crucial, especially in pipes with limited space or inlet runs. The unique FlowDC feature reduces the required straight inlet runs for clamp-on systems up to 2 × DN downstream of pipe disturbances such as elbows and contractions. FlowDC, available in Proline Prosonic Flow W 400 and Prosonic Flow P 500, enables non-invasive measurements without pressure loss. This whitepaper discusses the two-step approach of FlowDC technology to compensate for errors introduced by a distorted flow profile.