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Process Control Case Histories by Gregory K. McMillan

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Funny You Should Ask a Process Control Engineer

Have you ever been asked a question on process control that leaves you at a loss for words? Here is your chance to amaze friends and relatives (or at least baffle them) by learning some good concepts and analogies. If you understand the ideas and their significance conveyed in the answers to the following devastating questions, you might just become famous by Friday.

What is loop deadtime? Deadtime is that period of time from the start of a disturbance until the controller makes a correction that arrives at the same point in the loop that the disturbance entered. The controller needs to see the upset, react to it, and send the correction to the right place. To appreciate deadtime, consider when ...

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