Measuring Mass Flow of Air in a Duct with a Multivariable Transmitter
When measuring the mass flow of air flow in a duct or pipe, using the correct flow element is half the battle . After deciding that using a differential pressure device like a Velocity Averaging Pitot is the right way to go, getting the correct instrumentation to measure that differential pressure is not something that every transmitter can do. VAP³ Velocity Averaging Pitot In typical industrial, combustion, and power generation applications , the differential pressure to be measured ranges from a high of 8 to 10 inches of water column down to 0.25 inch of water column or even less. Getting a transmitter that can measure these ranges and have a turndown that can measure the low end accurately usually requires getting a laboratory type of transmitter, rather than an industrial differential pressure transmitter. These are typically not satisfactory for these types of applications, so most users go with an industrial transmitter that has a very large URL (upper ran...