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Title: Fundamentals Of Pneumatic Control
Author: J. Patrick Diciasare
Source: 1995 International School of Hydrocarbon Measurement
Year Published: 1995
Abstract: As a user of automatic controllers, part of your job may include adjusting and maintaining controllers in your plant. In order to do it properly, you need to know the different kinds of controllers and the kinds of output signals they produce. The controller can be identified several different ways. One way is by power source, for example, the pneumatic controller is a controller that is powered by compressed gas, it is rugged, durable, and works well in a variety of adverse conditions. On the other hand, an electronic controller is a controller that is powered by electricity. An electronic controller can send signals over long distances in relatively short periods of time. Another way a controller is identified is by the process variable it controls. For example, a pressure controller is a controller that controls pipeline pressures. In addition to being identified by its power source and by the process variable it controls, a controller is also identified by the kind of controlling action it provides.

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