Like so many other industrial data networks, FOUNDATION Fieldbus is an “unswitched” or…
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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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A bridge circuit is basically a pair of voltage dividers where the circuit output is taken as the difference…
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Another category of control strategies involves the use of signal relays or function blocks with the ability…
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Learning is not merely a process of information transfer. It is first and foremost a transformation of…
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One of the most common, and most useful, pressure measuring instruments in industry is the differential…
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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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“Polyphase” means “many phases,” describing a form of AC electrical system where…
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Perhaps the most valuable skill an instrument technician can possess is the ability to efficiently diagnose…
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Most pneumatic instruments use a simple but highly sensitive mechanism for converting mechanical motion into…
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Disconnect Switches Disconnects are switches designed to isolate sections of a power system in case of damage…
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Programmable logic controllers are essentially nothing more than special-purpose, industrial computers. As…
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A simple control system drawn in block diagram form looks like this: Information from the measuring device…
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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 very purpose of physics is to quantitatively describe and explain the physical world in as few terms as…
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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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A very common method for directly controlling low flow rates of fluids is to use a device known as a metering…
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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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The following collection of photographs chronicles the complete disassembly of a Fisher E-body globe valve…
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An electromechanical relay is an electrical switch actuated by an electromagnet coil. As switching devices,…
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