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Molecular Quantities

Textbook

Sample sizes of chemical substances are often measured in moles. One…

On/off Control (Bang-bang Control)

Textbook

Once while working as an instrument technician in an aluminum foundry,…

Elementary Thermodynamics

Textbook

Thermodynamics is the study of heat, temperature, and their related…

Control Valve Actuators

Textbook

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

Comparison of Op-Amp Circuits With Analogous Pneumatic Mechanisms

Textbook

Self-balancing pneumatic instrument mechanisms are very similar to…

Concepts and Laws of Probability

Textbook

While the term “probability” may evoke images of…

Rotating Magnetic Fields in Three-phase AC Induction Motors

Textbook

The following animation shows how the “rotating” magnetic…

References

Textbook

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

Antennas and Resonant Circuits (Tank Circuits)

Textbook

Capacitors store energy in electric fields, proportional to the square…

Transformer Basics and Principles of Operation

Textbook

The transformer is one of the most important components in all of AC…

VSD and VFD Motor Drive Features

Textbook

Modern DC and AC motor drives provide features useful when using…

FOUNDATION Fieldbus Design Philosophy

Textbook

To understand just how different FOUNDATION Fieldbus is from other…

Instrument and Process Equipment Symbols

Textbook

This section shows some of the many instrument symbols found in…

Human-Machine Interfaces (HMIs)

Textbook

Human-machine interfaces, or HMIs, are a critical part of nearly all…

Numerical Integration

Textbook

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

Troubleshooting Current Loops

Textbook

A fundamental principle in instrumentation system troubleshooting is…

Pneumatic Sensing Elements

Textbook

Most pneumatic instruments use a simple but highly sensitive mechanism…

Pneumatic Actuator Response

Textbook

A limitation inherent to pneumatic valve actuators is the amount of…

4-wire “Passive” Versus “Active” Output Transmitters

Textbook

Some self-powered (4-wire) analog electronic transmitters are designed…

Numerical Differentiation

Textbook

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