Disconnect Switches Disconnects are switches designed to isolate sections of a power system in case of damage…
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An electromechanical relay is an electrical switch actuated by an electromagnet coil. As switching devices,…
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The vast majority of PID controllers in service today are digital in nature. Microprocessors executing PID…
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Some self-powered (4-wire) analog electronic transmitters are designed to behave as electrical loads rather…
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To show a practical process example, let’s examine three diagrams for a compressor control system,…
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(Will be addressed in future versions of this book)
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Regulating the electric power sent to an electric motor is a task performed by high-speed switching…
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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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This section does not describe a particular type of flowmeter, but rather a design that may be implemented for…
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The advent of “smart” field instruments containing microprocessors has been a great advance for…
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A much simpler alternative to continuous vibration sensors (displacement or acceleration) and monitoring…
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A pneumatic controller receives a process variable (PV) signal as a variable air pressure, compares that…
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A technological advance introduced in the late 1980’s was HART, an acronym standing for Highway…
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As a general rule, high achievement only takes place in an atmosphere of high expectations. Sometimes these…
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The following collection of photographs chronicles the complete disassembly of a Fisher E-body globe valve…
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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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Two extremely important principles in electric circuits were codified by Gustav Robert Kirchhoff in the year…
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Classical mechanics (often called Newtonian mechanics in honor of Isaac Newton) deal with forces and motions…
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A hand switch is exactly what the name implies: an electrical switch actuated by a person’s hand motion.…
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A unique form of differential pressure-based flow measurement deserves its own section in this flow…
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