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Cascade Control

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

Basics of Bridge Circuits

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

Limit Switches

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

Diagnosing Feedback Control Problems

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

Analysis of Practical Pneumatic Instruments

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

DC Motor Speed Control

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

Self-regulating, Integrating, and Runaway Process Characteristics

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

High-reliability Control Systems

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

Logic Programming in PLCs

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

Basic Feedback Control Principles

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Feedback Control System Components Before we begin our discussion on…

Instantaneous and Time-overcurrent (50/51) Protection

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Perhaps the most basic and necessary protective relay function is…

Interposing Relays in PLCs

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In addition to directly performing logic functions, electromechanical…

Phasors, Phase Shift and Phasor Algebra

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

AC Motor Speed Control

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

Controller Output Current Loops

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

Non-dispersive Luft Detector Spectroscopy

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

Control Valve Actuators

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

Valve Positioners

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

AC Motor Braking

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

VSD and VFD Motor Drive Features

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

Vibration Sensors

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Sensors used to measure vibration come in three basic types:…

Physics and Chemistry Terminology and Definitions

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Atom: the smallest unit of matter that may be isolated by chemical…

DC Motor Speed Control

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

Tube and Tube Fittings

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

Flow Measurement from Differential Pressure

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

Analog to Digital Conversion and ADCs

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In order to provide an interface between the internal (digital) world…

Elementary Thermodynamics

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

Velocity-based Flowmeters

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The Law of Continuity for fluids states that the product of mass…

Derivative (Rate) Control

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

Resistance, Reactance and Impedance

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Electrical Resistance Resistance (\(R\)) is the dissipative opposition…

Weighfeeders

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A special type flowmeter suited for powdered or granular solids is the…

Transmitter Damping Adjustments

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

Directional Overcurrent (67) Protection

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While 50 and 51 (instantaneous and time overcurrent) relay functions…

Pneumatic PID Controllers

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A pneumatic controller receives a process variable (PV) signal as a…

Supervisory Control

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In a manually-controlled process, a human operator directly actuates…

What is Electrical Power?

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Since we often use electricity to convey energy from one location to…

What is Hydrostatic Pressure?

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A vertical column of fluid generates a pressure at the bottom of the…

Electromagnetism Basics

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The fundamental principle of electromagnetism is that an electric…

A Comparison of PID Controller Tuning Techniques

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In this section I will show screenshots from a process loop simulation…

Transfer Function Analysis

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An extremely important topic in engineering is that of transfer…