How processes are controlled is fundamental to a safe, stable, and accurate system. In this section, we closely examine the theory behind control, why you might choose one option over another, and how to go about installing and commissioning control systems.
An introduction to controls
Here we investigate why automatic controls are more reliable than manual options, and look at how controls deal with processes that use steam, water, compressed air, and hot oils.
Basic Control Theory
Put simply, the two basic control options are either on/off or continuous control. This module looks in detail at the implications of each, paying close attention to the three elements of continuous control: proportional, integral, and derivative.
Control loops and dynamics
What is a control loop, what are the differences between control loop options (open, closed, single, multi, cascade), what happens in each control loop, and various process reactions are all answered in this topic.
Choice and Selection of Controls
How to Choose Which Controls to Use? An overview of your options (self-activating, pneumatic, electric, electro-pneumatic), a look at valves and actuators, and choices of controllers. Guided by consideration of safety, stability, and accuracy.
Installation and commissioning of controls
A detailed look at the elements involved in the installation and commissioning of controls, including how the Ziegler-Nicholls method can be used for setting controllers.
Computers in Controls
Looking at the evolution of IT helping improve control, up to the introduction of fieldbus technology in streamlining operations.