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Creative Commons Attribution 4.0 International Public License By…

Practical Measures of Reliability

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In reliability engineering, it is important to be able to quantity the…

Phasors, Phase Shift and Phasor Algebra

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Phasors are to AC circuit quantities as polarity is to DC circuit…

Problem-solving by Simplification

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A whole class of problem-solving techniques focuses on altering the…

Thermocouple Types, Junctions, Connector and Tip Styles

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RTDs are completely passive sensing elements, requiring the…

The s Variable: Euler’s Relation and Phasor Expressions of Waveforms

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A powerful mathematical concept useful for analyzing practically any…

Transmitter Damping Adjustments

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The vast majority of modern process transmitters (both analog and…

Analog Electronic PID Controllers

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Constructing PID control systems using discrete components is a…

Transfer Function Analysis

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An extremely important topic in engineering is that of transfer…

Control Valve Actuators

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The purpose of a control valve actuator is to provide the motive force…

Different PID Equations

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

Ladder Diagram (LD) Structure Commands

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

Boiler Water Level Control System Example

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Steam boilers are very common in industry, principally because steam…

Fundamental Principles of Industrial Instrumentation

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Shown here is a partial listing of principles applied in the subject…

Valve Positioners

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The reason why a pneumatic control valve’s stem position…

Change-of-quantity Flow Measurement

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Flow, by definition, is the passage of material from one location to…

Limit Switches

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A limit switch detects the physical motion of an object by direct…

Numerical Differentiation

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

Valve Failure Modes

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An important design parameter of a control valve is the position it…

Proper Care and Feeding of Pneumatic Instruments

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Perhaps the most important rule to obey when using pneumatic…

Introduction to Protective Relaying

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Circuit breakers used in residential, commercial, and light industrial…

Proportional-only Offset

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A fundamental limitation of proportional control has to do with its…

On/off Electric Motor Control Circuits

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An electric motor is often used as a discrete control element in a…

Atomic Theory and Chemical Symbols

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The three “elementary” particles of matter comprising all…

Electrical Resistance and Ohm’s Law

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To review, voltage is the measure of potential energy available to…

Non-contact Temperature Sensors

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Virtually any mass above absolute zero temperature emits…

Periodic Table of the Elements

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All substances are comprised of various elements in various…

Zero and Span Adjustments (Analog Instruments)

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Linearity of Measurement Instruments The purpose of calibration is to…

Dimensional Analysis

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An interesting parallel to the “unity fraction” unit…