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Title: Principles Of Automatic Control
Author: Willard Sutton
Source: 1969 Gulf Coast Measurement Short Course (Now called ASGMT)
Year Published: 1969
Abstract: A regulator is any device that influences the operation, flow or reaction of another piece of equipment or product. This term, regulator, could even apply to a wife in her efforts to control her husband. However, the control isnt complete since he occasionally gets out of her sight and may vary slightly from her instructions. This would be classified as an open loop operation since the wife has no feedback on her husbands action consequently she can not take corrective actions to keep hira on the straight and narrow. If, however, she has enough spies out, she will know his every move. This is complete control or a closed loop operation. Probably most of us fall into this catagory. The controllers used in conjunction with other equipment to regulate gas flows provide the spying and corrective action required to keep these flows at the desired levels.

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