A Safety Instrumented Function, or SIF, is one or more components designed to execute a specific…
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Any physical location in an industrial facility harboring the potential of explosion due to the presence of…
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Process analyzers measure the concentration of specific substances for the purpose of measuring and/or…
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Valve actuators provide force to move control valve trim. For precise positioning of a control valve, there…
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Flow, by definition, is the passage of material from one location to another over time. So far this chapter…
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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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(Will be addressed in future versions of this book)
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An variable-area flowmeter is one where the fluid must pass through a restriction whose area increases with…
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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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What is Calibration? To calibrate an instrument means to check and adjust (if necessary) its response so the…
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Since we often use electricity to convey energy from one location to another, it is important to be able to…
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An important legacy technology for all kinds of continuous measurement is the self-balancing system. A…
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A unique form of differential pressure-based flow measurement deserves its own section in this flow…
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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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Given the ability of pressurized fluids to transmit force over long distances, it is not surprising that many…
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In November of 2007 a new computer virus was submitted to a virus scanning service. The purpose of this new…
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Like so many other industrial data networks, FOUNDATION Fieldbus is an “unswitched” or…
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As previously defined, calibration refers to the checking and adjustment of an instrument so that its output…
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The term “grid” refers to the conductors and equipment interconnecting power sources to power…
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A great many chemical composition measurements may be made indirectly by means of electricity, if those…
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“Polyphase” means “many phases,” describing a form of AC electrical system where…
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Circuit breakers used in residential, commercial, and light industrial service are self-tripping devices: they…
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A fluid is any substance having the ability to flow: to freely change shape and move under the influence of a…
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