Regulating the electric power sent to an electric motor is a task performed by high-speed switching…
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Human-machine interfaces, or HMIs, are a critical part of nearly all control systems, complementing the…
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A laser is a light source emitting waves of light that not only share the exact same frequency (color)…
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In our first signal characterization example, we tackle the problem of measuring fluid flow through a pipe. To…
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The following animation shows how the “rotating” magnetic field of a three-phase AC induction…
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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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The majority of flowmeter technologies operate on the principle of interpreting fluid flow based on the…
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The following collection of photographs chronicles the complete disassembly of a Fisher E-body globe valve…
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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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The transformer is one of the most important components in all of AC circuitry. Principally used to…
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Modern DC and AC motor drives provide features useful when using electric motors as final control elements.…
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Modern analog-to-digital converters are phenomenally accurate, dependable, repeatable, and surprisingly…
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Lipták, Béla G. et al., Instrument Engineers’ Handbook – Process Measurement and Analysis Volume I,…
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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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Using filter cells to eliminate wavelengths associated with interfering gases is called positive filtering in…
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Filled-bulb systems exploit the principle of fluid expansion to measure temperature. If a fluid is enclosed 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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A temperature switch is one detecting the temperature of some substance. Temperature switches often use…
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Level gauges are perhaps the simplest indicating instrument for liquid level in a vessel. They are often found…
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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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