Measurement of Air Velocity by Orifice Plate and Pitot Static Tubes

In order to meet the requirements of calibration of the anemometers,a system combined orifice plate and Pitot static tubes as standards is developed.The components and specialties of the system are described.In the measuring range of 0.20 to 30.00?m/s of air velocity,its measuring expanded uncertainty is 2% with the 95% confidence level.