density and C is a correction constant dependent on the design of the Pitot Static tube. NOTE: This equation is typically valid for incompressible (constant density) flow. High... velocities, use the largest pressure range available to avoid overloading. The Pitot Static tube can then be carefully inserted into the gas flow. It may be necessary to drill holes... is comparable, then simultaneous measurement of target flow density is unnecessary and the temperature and RH sensors can be left out of the test area. Pitot Static tube duct surveys If...