Water level cascade control / Siti Nor Mashita Mahadi

This paper is a study on water level cascade control and how to control the control system in a chemical process plant in order to maintain its stability and efficient process control by using Foxboro Intelligent Automation DCS at various Proportional Band (PB) and Integral time (I) value. It is very important to keep the condition of process system under specification at certain limit in order to ensure the safety of chemical plant as well as to avoid any changes during the operation so the process maintains at its operating conditions. Accordingly, when the value of PB is high, the process response would be slower and when the I is high, process would take longer time to stabilized and reach set point. However, increasing the PB and I value make the overshoot to be decreased.