As we have seen, feedforward control is a way to improve the stability of a feedback control system in the…
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A Safety Instrumented Function, or SIF, is one or more components designed to execute a specific…
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Most of these formulae appear in molecular chemical form rather than structural form. For example, ethanol…
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The three “elementary” particles of matter comprising all atoms are electrons, protons, and…
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Process analyzers measure the concentration of specific substances for the purpose of measuring and/or…
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A great many chemical composition measurements may be made indirectly by means of electricity, if those…
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Sometimes we encounter a diversity of instrument signal standards in one control system. Such is the case with…
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The final step in treating wastewater before releasing it into the natural environment is to kill any harmful…
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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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pH is the measurement of the hydrogen ion activity in a liquid solution. It is one of the most common forms of…
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A chemical reaction resulting in a net release of energy is called exothermic. Conversely, a chemical reaction…
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PID control can be a confusing concept to understand. Here, a brief summary of each term within PID (P. I, and…
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There is much to be said for neatness of assembly in electrical signal wiring. Even though the electrons…
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A fundamental principle in instrumentation system troubleshooting is that every instrument has at least one…
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It is possible to convey electrical power and communicate analog information over the same two wires using 4…
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At the root of successful system diagnosis is a rigorous adherence to scientific reasoning. There exists no…
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Any power grid large enough to meet the demand of an entire nation must have multiple generators drawing from…
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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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Abdelaziz, Ahmed (June 2014) Identified numerous typographical errors throughout the book, mostly repeated…
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As discussed at the beginning of this chapter, instrumentation safety may be broadly divided into two…
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What is Calibration? To calibrate an instrument means to check and adjust (if necessary) its response so the…
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A great many precision instruments use the principle of balance to measure some quantity. Perhaps the simplest…
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Feedback obtained from industrial users of FF reveal a common pattern: Fieldbus is a powerful and reliable…
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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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Coy, John J. et. al. (December 2012) Sampled graphic illustrations from his NASA Reference Publication…
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Most of these formulae appear in molecular chemical form rather than structural form. For example, ethanol…
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As described earlier in this chapter, calibration refers to the adjustment of an instrument so its output…
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Those familiar with industrial instrumentation will find much within the electric power industry remarkably…
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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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A level switch is one detecting the level of liquid or solid (granules or powder) in a vessel. Level switches…
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Three-phase AC is the dominant mode of electric power generation and distribution in modern societies.…
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The advent of “smart” field instruments containing microprocessors has been a great advance for…
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“Radio” systems use electromagnetic fields to communicate information over long distances through…
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A technological advance introduced in the late 1980’s was HART, an acronym standing for Highway…
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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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Although analog electronic process controllers are considered a newer technology than pneumatic process…
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This section shows some of the many instrument symbols found in different types of technical diagrams used to…
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Capacitive level instruments measure electrical capacitance of a conductive rod inserted vertically into a…
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There is much to be said for neatness of assembly in electrical signal wiring. Even though the electrons…
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Area refers to the size of two-dimensional surface. Volume refers to the size of a three-dimensional space. To…
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The final element of PID control is the “D” term, which stands for derivative. This is a calculus…
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A variety of problem-solving techniques have been presented for students over the years which are all helpful…
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The efficient identification and correction of instrument calibration errors is an important function for…
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Regardless of valve type, all stem-actuated control valves require some form of seal allowing motion of the…
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The majority of flowmeter technologies operate on the principle of interpreting fluid flow based on the…
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Earlier in this chapter you were shown a model of a nitrogen atom with a dense nucleus (comprised of protons…
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Some self-powered (4-wire) analog electronic transmitters are designed to behave as electrical loads rather…
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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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Like so many other industrial data networks, FOUNDATION Fieldbus is an “unswitched” or…
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A great many precision instruments use the principle of balance to measure some quantity. Perhaps the simplest…
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One of the most important accessories for any temperature-sensing element is a pressure-tight sheath known as…
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