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Instantaneous and Time-overcurrent (50/51) Protection

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Perhaps the most basic and necessary protective relay function is…

DC Motor Speed Control

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DC electric motors generate torque by a reaction between two magnetic…

Basics of Bridge Circuits

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

Logic Programming in PLCs

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Although it seems each model of PLC has its own idiosyncratic standard…

Controller Output Current Loops

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The simplest form of 4-20 mA current loop is the type used to…

Cascade Control

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

High-reliability Control Systems

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

Analysis of Practical Pneumatic Instruments

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

Basic Feedback Control Principles

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Feedback Control System Components Before we begin our discussion on…

Non-dispersive Luft Detector Spectroscopy

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Non-dispersive analysis, while newer in discovery than dispersive…

Valve Positioners

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

VSD and VFD Motor Drive Features

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

AC Motor Speed Control

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

Integral (Reset) Control

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

On/off Electric Motor Control Circuits

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

Ladder Diagram (LD) Structure Commands

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

Limit Switches

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

Digital Representation of Numerical Data

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Process measurements are often of an analog nature: the temperature of…

Practical PID Controller Features

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

AC Motor Braking

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

Quantitative PID Tuning Procedures

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A quantitative PID tuning procedure is a step-by-step approach leading…

Analog Signal Conditioning and Referencing

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Modern analog-to-digital converters are phenomenally accurate,…

Understanding the Calculus Concepts of Differentiation and Integration

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The following animation shows the calculus concepts of differentiation…

Basics of Electrical Current

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Current is the name we give to the motion of electric charges from a…

The HART Digital/Analog Hybrid Standard

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A technological advance introduced in the late 1980’s was HART,…

4-wire (“self-powered”) Transmitter Current Loops

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DC electric current signals may also be used to communicate process…

Proportional-only Offset

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

4 to 20 mA Analog Current Signals

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The most popular form of signal transmission used in modern industrial…

Standardized Volumetric Flow

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The majority of flowmeter technologies operate on the principle of…

Non-contact Temperature Sensors

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Virtually any mass above absolute zero temperature emits…

Fiber Optic Data Communication

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Light has long been used as a long-range signaling medium. While…

Heuristic PID Tuning Procedures

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In contrast to quantitative tuning procedures where definite numerical…

Electromagnetism Basics

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The fundamental principle of electromagnetism is that an electric…

Single-line Electrical Diagrams

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Electrical power grids primarily consist of three-phase AC circuits.…

Basic Operation of a Gas Chromatograph

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This animation shows the basic operation of a gas chromatograph,…

Calibration Standards to Produce and Measure Physical Quantities

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As previously defined, calibration refers to the checking and…

Chromatography: Methods, Detectors and Species

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Imagine a major marathon race, where hundreds of runners gather in one…

Atomic Theory and Chemical Symbols

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The three “elementary” particles of matter comprising all…

Dispersive Spectroscopy

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

Basics of Bridge Circuits

Textbook

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