Ideal for classroom use or self-study, this newly updated best-selling book has provided thousands of students, technicians, engineers, and sales people with a practical introduction to the principles, technologies, and strategies used in industrial process control. This fifth edition takes the same proven approach of previous editions. Each chapter begins with basic definitions and concepts that allow readers to become well versed in the principles necessary to understand the variables that affect process control systems. New features in the fifth edition include improved coverage of process control computers and industrial networks and a new chapter on liquid density measurement. Sections were also added on human machine interface (HMI), wireless devices and networks. The book includes solutions to exercises that make it more suitable for self-study.