We wind up our series on measurement and valve dynamics with the timely question do we want a large time constant anywhere? A large time constant in the measurement or valve slows down what the controller can see and manipulate, respectively. A large time constant in the process slows down the effect of disturbances at …
Tag Archive: measurement+dynamics process+dynamics sensors system+performance
Jun
23
So Smooth
Is smooth good? We like smooth trend charts but is that what is really going on in the process? Do we want a smooth talking measurement or the straight story? My first clue dates back to a startup of a world class intermediate plant when smooth temperature recordings were traced back to sand in thermowells …
