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Title: Maintenance And Troubleshooting Of Pneumatic Control Loop Instruments
Author: Henry K. Bacon
Source: 1984 Appalachian Gas Measurement Short Course
Year Published: 1984
Abstract: A control loop is comprised of a process (a pipeline for this discussion), a process variable sensing and measuring device, a controller and a final control element (a regulator or control valve). The functions of these parts of the control loop are to determine the present value of the process variable, e.g., static pressure, compare it to a desired value of the process variable and take some corrective action if the process variable is not what an operator or gas dispatcher would like it to be. In Manual operation of thecontrol loop, the operator is the controller through his senses and intelligence. In Automatic operation, the controller is allowed to take over control and the operator is no longer in the control loop.

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