Positive Displacement Meters
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P.D. meter (Positive Displacement meter) is a very reliable flow meter type. P.D. flow meters measure the volumetric flow rate of a moving fluid entering a measuring chamber having a fixed and known volume for each meter type. Thanks to their working principle, positive displacement meters can be used even for the measurement of viscous fluids, such as oils, fuels, and solvents that are hardly measured by other meter types