INSTRUMENTATION AND CONTROL Module 7 Process Controls
Department of EnergyFundamentals HandbookINSTRUMENTATION AND CONTROLModule 7Process ControlsblankProcess ControlsTABLE OF CONTENTSTABLE OF CONTENTSLIST OF ivLIST OF OF CONTROL 2Automatic CONTROL 4Functions of Automatic 4Elements of Automatic 4Feedback 6CONTROL LOOP 7Feedback CONTROL System Block 9Process Time 13Stability of Automatic CONTROL 16TWO POSITION CONTROL 17Two Position 18Example of Two Position 19Modes of Automatic 21PROPORTIONAL CONTROL 22Control 22Proportional 22Example of a Proportional Process CONTROL 27Rev. 0Page iIC-07TABLE OF CONTENTSProcess ControlsTABLE OF CONTENTS (Cont.)
Automatic control systems neither replace nor relieve the operator of the responsibility for maintaining the facility. The operation of the control systems is periodically checked to verify proper operation. If a control system fails, the operator must be able to take over and control the process manually.
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