Video: Tuning the Hot Air Loops

By Cecil Smith, president of Cecil L. Smith, Inc.

This video examines the tuning of the hot air pressure and hot air temperature controllers. The loops will be tuned in the sequence suggested in the previous video but not as part of plant start-up. Instead, the process is operating and each controller has been previously tuned. The objective is to assess how well each loop is tuned, and make adjustments if appropriate.

To access the entire video series from Cecil Smith, visit our video page.

Cecil Smith is president of Cecil L. Smith, Inc., Baton Rouge, La., a firm specializing in automation technology that he founded after leaving the faculty of Louisiana State University. Also cited as one of the 50 most influential people in the field, he teaches courses on control topics and has authored or co-authored 14 books, including "Digital Control of Industrial Processes and more than 100 articles. You can email him at

He is also one of our experts in our Ask the Experts forum. You can pose your instrumentation and control questions to him here.