Department of Chemical Engineering

Exp-4-Cib.docx - Process Instrumentation Control Experiment...

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Process Instrumentation & Control Experiment 4: Pressure Control Process Name: Wen jian Low Student ID: 14392801 13/09/2013
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Introduction The SOLTEQ Pressure Control Trainer is made of industrial graded instrumentation, specially designed to show a realistic working environment of standard industrial pressure control loop. It is used to demonstrate how a pressure loop can be controlled using a microprocessor based controller. Processes that benefit most from PID control have rapid and large disturbances in which derivative action can respond to the rapidity of the changes, and integral action can respond to the duration of them. Objectives - To demonstrate the characteristic of PB + I + D on a pressure process control loop. - To demonstrate the loop tuning procedures on a pressure process control loop. Procedure Experiment 1: Close loop P plus I and Derivative Control 1. The control loop is put into “Manual Mode”. The output is then adjusted to 50% and pressure is allowed to build up in TN2. HV2 is manipulated to adjust FI1 to 20L/min. 2. A PB value of 200%, I value of 3 sec and D value of 0 sec is enterd. 3. The output is gradually adjusted so that the pressure of the tank matches the set point of 50%. 4. The recordeer is started and the control loop is put on “Auto mode”. 5. A load change is simulated by opening HV2 so that Fi1 shows 40L/min for 5 seconds. HV2 is then restored to its initial position. 6. The measurement is waited until it shows a uniform pattern, and then stopped. 7. The control loop is then put into “Manual mode” and the output is gradually adjusted so that the measurement matches the set point.
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