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INSTRUMENTATION AND CONTROL Module 7 Process Controls

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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.)

pump with a variable speed control (Figure 1). The feed rate of chemicals that maintain proper chemistry of a system is determined by an operator, who is not part of the control system. If the chemistry of the system changes, the pump cannot respond by adjusting its feed rate (speed) without operator action. IC-07 Page 2 Rev. 0

  Control, Speed

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