# Exp-3-17098128.docx - Calvin Tse-Liang Chin 17098128...

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Calvin Tse-Liang Chin 17098128 PROCESS INSTRUMENTATION & CONTROL Experiment 3 Essentials of Process Control Temperature Control Process Name: Calvin Tse-Liang Chin Student ID: 17098128 Date: 12/09/2016 Group: 43

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Calvin Tse-Liang Chin 17098128 1.0 Objectives To demonstrate the effectiveness of an on/off method of controlling heater temperature and compare with the effectiveness of a P only controller, a P+I controller and a P+I+D controller. 2.0 Background and Equipment A PCT52 Temperature Process was used as a means of measuring the temperature of the air. A diagram of this appliance can be seen below as figure 1. This appliance follows the principles used in industrial grade instruments of the same purpose. It shows he different ways in which temperature can be controlled in a realistic environment with the fan in the process acting as a disturbance. A PC with PCT52 software loaded is used to visually show and graph the temperatures obtained from this experiment. Figure 1: PCT52 Temperature Control Apparatus Diagram from Lab Manual
Calvin Tse-Liang Chin 17098128 3.0 The PID Controller The Proportional Integral Derivative Controller calculates the error (offset) between measured values and the set point value. The Integral control eliminates the offset created by the proportional control. This, however, produces an oscillatory response. Derivative control anticipates the future error and stabilizes the system by adjusting the process accordingly. Therefore, it can be observed that PID controllers respond to all aspects mentioned and regulated the process to achieve the perfect system. 4.0 Experimental Procedure 4.1 Experiment 1: On/Off Control of Heater Temperature (Closed loop) 1. Click on the PID box and set the Proportional Band to 0%, Integral time to 0, Derivative time to 0 and the Set Point to 35°C and turn on the fan. Click Apply. 2. Ensure that the mode of operation is Automatic before exiting the PID Controller box. 3. Click the start button to commence the experiment. 4. Observe the graph and once the temperature is stable around the Set Point, change the Set Point to 50°C in the PID Controller box.

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