The most common final control element in the process control industries is the control valve.
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A typical application is a PID controller fed by a flow meter and using a control valve as the final control element.
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When all the measuring, comparing, and calculating are done, some type of final control element must implement the strategy selected by the controller.
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The input modules receive information from sensing instruments in the process ( or field ) and the output modules transmit instructions to the final control elements, such as control valves.
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They work on a variety of systems including primary control elements, transmitters, analyzers, sensors, detectors, signal conditioners, recorders, controllers and final control elements ( actuators, valve positioners, etc . ).
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In a chemical process, independent variables that can be adjusted by the controller are often either the setpoints of regulatory PID controllers ( pressure, flow, temperature, etc . ) or the final control element ( valves, dampers, etc . ).
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So if K _ p, the Proportional Gain, is very high, the Proportional Band is very small, which means that the Band of Controller Output, over which the final Control Element, like a Control Valve, will go from minimum to maximum ( or vice versa ) is very small.
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The advanced type of automation that revolutionized manufacturing, aircraft, communications and other industries, is feedback control, which is usually " continuous " and involves taking measurements using a sensor and making calculated adjustments to keep the measured variable within a set range by means of a " final control element ", such as a control valve.
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