Can the instruments read low velocities?
The velocity specification on the DP-CALCs is from 250 to 15,500 ft/min. A Pitot tube is necessary to make the velocity measurement. Velocity is not measured directly; it is converted from pressure. The conversion provides high resolution at high pressures and low resolution at low pressures, making velocity measurements below 1,000 ft/min inaccurate and impractical. The DP-CALCs read to 250 ft/min for people who want an estimate of the velocity below 1000 ft/min, but do not need an accurate reading.
