Valve actuators provide force to move control valve trim. For precise positioning of a control valve, there…
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All masses require force to accelerate (we can also think of this in terms of the mass generating a reaction…
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Human-machine interfaces, or HMIs, are a critical part of nearly all control systems, complementing the…
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Perhaps the simplest form of solid or liquid level measurement is with a float: a device that rides on the…
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The purpose of a control valve actuator is to provide the motive force to operate a valve mechanism. Both…
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Capacitance Any two electrical conductors separated by an insulating medium possess the characteristic called…
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A pneumatic controller receives a process variable (PV) signal as a variable air pressure, compares that…
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Some of the simplest types of digital communication networks found in industry are defined by the EIA…
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Converting between disparate units of measurement is the bane of many science students. The problem is worse…
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Three-phase AC is the dominant mode of electric power generation and distribution in modern societies.…
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A sliding-stem valve body is one where the moving parts slide with a linear motion. Some examples of…
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Learning how to tune PID controllers is a skill born of much practice. Regardless of how thoroughly you may…
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Coy, John J. et. al. (December 2012) Sampled graphic illustrations from his NASA Reference Publication…
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Every flow-measuring instrument exploits a physical principle to measure the flow rate of fluid stream.…
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(Will be addressed in future versions of this book)
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The disadvantages of pneumatic instruments are painfully evident to anyone familiar with both pneumatic and…
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Developed by the Modicon company (the original manufacturer of the Programmable Logic Controller, or PLC) in…
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Much has been written about the benefits of robust PID control. Increased productivity, decreased equipment…
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A flow switch is one detecting the flow of some fluid through a pipe. Flow switches often use…
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Feedback Control System Components Before we begin our discussion on process control, we must define a few key…
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