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Process Control

Process control is extensively used in industry and enables mass production of continuous processes such as oil refining, paper manufacturing, chemicals, power plants and many other industries. Process control enables automation, with which a small staff of operating personnel can operate a complex process from a central control room.

A commonly used control device called a programmable logic controller (PLC), is used to read a set of digital and analog inputs, apply a set of logic statements, and generate a set of analog and digital outputs.

In practice, process control systems can be characterised as one or more of the following:

  • Discrete – Found in many manufacturing, motion and packaging applications. Robotic assembly, such as that found in automotive production, can be characterized as discrete process control. Most discrete manufacturing involves the production of discrete pieces of product, such as metal stamping.
  • Batch – Some applications require specific quantities of raw materials to be combined in specific ways for particular durations to produce an intermediate or end result. One example is the production of adhesives and glues, which normally require the mixing of raw materials in a heated vessel for a period of time to form a quantity of end product. Other examples include the production of food, beverages and medicine. Batch processes are generally used to produce a relatively low to intermediate quantity of product per year (a few pounds to millions of pounds).
  • Continuous – Often, a physical system is represented through variables that are smooth and uninterrupted in time, for example the control of the water temperature in a heating jacket. Other examples include the production of fuels, chemicals and plastics. Continuous processes in manufacturing are used to produce very large quantities of product per year.

Burnand XH offer a wide range of process control equipment from many leading manufacturers.

 

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PLCs

Programmable Logic Controllers

VSDs Variable Speed Drives & Soft Starters
Temperature sensors Temperature & Pressure Measurement & Control
Valves & Level Controls Flow and Level Measurement & Control