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Analysis of Practical Pneumatic Instruments

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To better understand the design and operation of self-balancing…

VSD and VFD Motor Drive Features

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

Valve Positioners

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

High-reliability Control Systems

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As discussed at the beginning of this chapter, instrumentation safety…

Cascade Control

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A simple control system drawn in block diagram form looks like this:…

AC Motor Braking

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There are several different methods useful for causing an AC induction…

Control Valve Actuators

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

Ladder Diagram (LD) Programming Contacts and Coils

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In the United States, the most common language used to program PLCs is…

Self-regulating, Integrating, and Runaway Process Characteristics

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Perhaps the most important rule of controller tuning is to know the…

Integral (Reset) Control

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Imagine a liquid-level control system for a vessel, where the position…

Limit Switches

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

Basics of Bridge Circuits

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A bridge circuit is basically a pair of voltage dividers where the…

Ladder Diagram (LD) Structure Commands

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

AC Motor Speed Control

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AC induction motors are based on the principle of a rotating magnetic…

Diagnosing Feedback Control Problems

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Negative feedback systems, in general, tend to cause confusion for…

Non-contact Temperature Sensors

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Virtually any mass above absolute zero temperature emits…

Phasors, Phase Shift and Phasor Algebra

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

Digital PID Controllers

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The vast majority of PID controllers in service today are digital in…

On/off Electric Motor Control Circuits

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

Practical PID Controller Features

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

Sequential Function Chart (SFC) Programming

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(Will be addressed in future versions of this book)

Temperature Switches

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A temperature switch is one detecting the temperature of some…

Circuit Failure Analysis

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Perhaps the most valuable skill an instrument technician can possess…

Periodic Table of the Ions

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Phasor Analysis of Transformer Circuits

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Three-phase AC is the dominant mode of electric power generation and…

Dampers and Louvres

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A damper (otherwise known as a louvre) is a multi-element flow control…

Tube and Tube Fittings

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Tube, like pipe, is a hollow structure designed to provide an enclosed…

P, I, and D Responses Graphed

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Visualizing the actions of P, I, and D tuning parameters using graphs…

General Problem-solving Techniques

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A variety of problem-solving techniques have been presented for…

Continuous Float Level Transmitters

Textbook

Perhaps the simplest form of solid or liquid level measurement is with…

Chemical Reactor Temperature Control Example

Textbook

Sometimes we encounter a diversity of instrument signal standards in…

Digital Multimeter (DMM) Tips and Tricks

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The digital multimeter (DMM) is quite possibly the most useful tool in…

Solenoid Valves

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A very common form of on/off valve used for pneumatic and hydraulic…

Proportional-only Offset

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

Fluorescence Measurement

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When a high-energy photon strikes an atom, it may eject one of the…

Dispersive Spectroscopy

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The dispersion of visible light into its constituent colors goes all…

Basic Components Common to all Radio Systems

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“Radio” systems use electromagnetic fields to communicate…

Laminar Flowmeters

Textbook

A unique form of differential pressure-based flow measurement deserves…

On/off Shut-off Valves

Textbook

An on/off valve is the fluid equivalent of an electrical switch: a…

Motives for Compromising the Security of an Industrial Control System

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There are multiple motives for compromising the security of an…