A reader has a level measurement problem with a differential pressure level transmitter. The transmitter does not track the level properly. Check out the question and the in-depth answer in this contribution from ControlGlobal.com.
This article is the first in a series of web-exclusive items designed to increase your knowledge about the HART Field Communications Protocol. Read here to find out the benefits of using HART Communication.
Author: Ed T. Ladd, Jr., HART Communication Foundation, Austin, Texas
The HART Communication Foundation is an exclusive contributor to ChemicalProcessing.com. The Foundation is an independent, non-profit organization that provides worldwide support for application of the HART Protocol.
Particle segregation is a common problem in many bulk storage systems and its presence creates serious quality control problems. This exclusive contribution from Diamondback Technology discusses the do's and dont's of particle segregation.
Install a flow meter in the recycle, cascade the flow set point with a pressure control loop. With proper tuning, the valve characteristics are lost in the flow control loop, which should be tuned fast with PI.