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Title: Principles And Application Of Automatic Control
Author: Roy L. Sharp
Source: 1967 Gulf Coast Measurement Short Course (Now called ASGMT)
Year Published: 1967
Abstract: Gas industry processes and gas gathering systems have progressed to a point where they are complex and, at times, unstable. To obtain the desired results in years past, an operator was required to adjust hand valves continuously and to watch gauges or recorders. Automatic controllers and control systems were devised to obtain better products at lower costs and to free operators to perform several duties. Today, a controller sees a process measurement, compares it to a desired value or set point, and finally, adjusts a valve or other final operator to reduce any difference between measurement and set point to zero.

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