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Basic Components Common to all Radio Systems

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“Radio” systems use electromagnetic fields to communicate…

Practical PID Controller Features

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In order for any PID controller to be practical, it must be able to do…

Relay Circuits and Ladder Diagrams

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Electromechanical relays may be connected together to perform logic…

Gas Filter Correlation (GFC) Spectroscopy

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Using filter cells to eliminate wavelengths associated with…

Derivative (Rate) Control

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The final element of PID control is the “D” term, which…

Introduction to Calculus

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Few areas of mathematics are as powerfully useful in describing and…

Mechanical Pressure Elements

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Mechanical pressure-sensing elements include the bellows, the…

Introduction to Inductors and Inductance

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Any conductor possesses a characteristic called inductance: the…

Understanding Area, Volume and Common Geometry

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Area refers to the size of two-dimensional surface. Volume refers to…

References

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Lipták, Béla G. et al., Instrument Engineers’ Handbook – Process…

Relating 4 to 20 mA Signals to Instrument Variables

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A 4 to 20 mA current signal represents some signal along a 0 to 100…

Ethernet networks: Repeaters, Cabling and Switching Hubs

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An engineer named Bob Metcalfe conceived the idea of Ethernet in 1973,…

Safety Instrumented Functions and Systems

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A Safety Instrumented Function, or SIF, is one or more components…

Loop Diagrams (Loop Sheets)

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Finally, we arrive at the loop diagram (sometimes called a loop sheet)…

Flow Measurement from Differential Pressure

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Take for instance the problem of measuring fluid flow through a pipe.…

Teaching Diagnostic Principles and Practices

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Diagnostic ability is arguably the most difficult skill to develop…

Numerical Integration

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As we have seen, the concept of integration is finding the…

Ladder Diagram (LD) Structure Commands

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The simple PLC ladder diagram (LD) commands consist of contacts and…

Different PID Equations

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For better or worse, there are no fewer than three different forms of…

Motives for Compromising the Security of an Industrial Control System

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There are multiple motives for compromising the security of an…

Principles, not Procedures

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One of the marks of a successful problem-solver is a habit of applying…