Sometimes we encounter a diversity of instrument signal standards in one control system. Such is the case with…
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Control valves are supposed to deliver reliable, repeatable control of process fluid flow rate over a wide…
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A machine in the broad sense of the word is any device designed to translate some form of energy into useful…
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Abdelaziz, Ahmed (June 2014) Identified numerous typographical errors throughout the book, mostly repeated…
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A very common form of on/off valve used for pneumatic and hydraulic systems alike is the solenoid valve. A…
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As we have seen, the concept of integration is finding the accumulation of one variable multiplied by another…
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Most people reading this book have likely had the experience of adjusting water temperature using two hand…
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Some analyzers measure the composition of a process stream by directly immersing the sensing element in that…
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Perhaps the most important rule to obey when using pneumatic instruments is to maintain clean and dry…
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As discussed at the beginning of this chapter, instrumentation safety may be broadly divided into two…
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A limitation inherent to pneumatic valve actuators is the amount of air flow required to or from the actuator…
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A different strategy for controlling the flow of fluid is to insert a rotary element into the flow path.…
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A vertical column of fluid generates a pressure at the bottom of the column owing to the action of gravity on…
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Current is the name we give to the motion of electric charges from a point of high potential to a point of low…
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Pipe is a hollow structure designed to provide an enclosed pathway for fluids to flow, usually manufactured…
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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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Perhaps the most important rule of controller tuning is to know the process before attempting to adjust the…
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There are many process control applications in the industry where it is desirable to have multiple control…
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Some problem-solving techniques are unique to quantitative problems, involving mathematical calculations. In…
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An important design parameter of a control valve is the position it will “fail” to if it loses…
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This section does not describe a particular type of flowmeter, but rather a design that may be implemented for…
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Learning from reading printed text is a kind of problem-solving activity it is own right. The problem is how…
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(Will be addressed in future versions of this book)
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Shown here is a partial listing of principles applied in the subject matter of this chapter, given for the…
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The reason why a pneumatic control valve’s stem position corresponds linearly to the amount of air…
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To better understand the design and operation of self-balancing pneumatic mechanisms, it is helpful to examine…
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Those familiar with industrial instrumentation will find much within the electric power industry remarkably…
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Lipták, Béla G. et al., Instrument Engineers’ Handbook – Process Measurement and Analysis Volume I,…
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Disturbances in the liquid tend to complicate liquid level measurement. These disturbances may result from…
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“As to methods there may be a million and then some, but principles are few. The man who grasps…
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Steam boilers are very common in industry, principally because steam power is so useful. Common uses for steam…
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AC induction motors are based on the principle of a rotating magnetic field produced by a set of stationary…
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A machine in the broad sense of the word is any device designed to translate some form of energy into useful…
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Many liquid substances undergo a process whereby their constituent molecules split into positively and…
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Few areas of mathematics are as powerfully useful in describing and analyzing the physical world as calculus:…
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When a high-energy photon strikes an atom, it may eject one of the lower-level electrons from its shell,…
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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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A unique form of technical diagram for describing the abstract functions comprising a control system (e.g. PID…
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An extremely important topic in engineering is that of transfer functions. Simply defined, a transfer function…
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A limit switch detects the physical motion of an object by direct contact with that object. An example of a…
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