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Title: Theory And Operation Of Pneumatic Controllers
Author: Robert H. Welker
Source: 1982 Appalachian Gas Measurement Short Course
Year Published: 1982
Abstract: It is important for gas men working with pneumatic controllers on a day to day basis to really understand them. Not to understand the controller can be a continual burden to the operator, In addition to presenting circumstances for an operation of lower quality than generally desired. Therefore, the objective of this paper is to try to help develop an understanding and attitude toward the controller that is absolutely essential to high quality gas control. When we speak of controllers, we want to differentiate them from the pilot type of control. In general terms, a pressure controller is a separate unit from the control valve and it will have some constant bleed to atmosphere. Again, in general terms, we think of pilot controls as being an Integral part of the regulator and having a downstream bleed. What is the difference in these two types of control? One important difference is the fact that the pilot system can never match the efficiency of a pneumatic controller because it is the controller which can utilize reset, the function that keeps our process on set point regardless of changes in upstream pressure or load conditions. Furthermore, it is the controller that has a very wide range of sensitivity adjustments so that it can be tuned to fit every type of load.

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