Rosemount Differential Pressure flow meters, often called DP flow meters, provide accurate and reliable volumetric flow measurements for clean liquids, gases, and steam. Rosemount DP flow meters use an orifice or laminar plate to create an artificial constriction in the flow path. As fluids pass that constriction, the resulting pressure loss is measured which is proportional to flow rate. This time-proven flow measurement technology is ideal for a wide range of flow measurement applications.