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Boiler Water Level Control System Example

Textbook

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

Bi-metal Temperature Sensors

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Solids tend to expand when heated. The amount that a solid sample will…

AC Motor Speed Control

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

Overpressure Protection Devices

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Fluid pressure exerts force on any surface area it contacts, as…

Pressure Switches

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A pressure switch is one detecting the presence of fluid pressure.…

Understanding the Calculus Concepts of Differentiation and Integration

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The following animation shows the calculus concepts of differentiation…

Capacitive Level Measurement

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Capacitive level instruments measure electrical capacitance of a…

Pipe and Pipe Fittings

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Pipe is a hollow structure designed to provide an enclosed pathway for…

Using Manometers for Measuring Pressure

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A very simple device used to measure pressure is the manometer: a…

Process and Instrument Diagrams

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The next level of detail is the Process and Instrument Diagram, or…

Proportional-only Offset

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

Thermistors and Resistance Temperature Detectors (RTDs)

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One of the simplest classes of temperature sensor is one where…

Proximity Switches

Textbook

A proximity switch is one detecting the proximity (closeness) of some…

Standardized Volumetric Flow

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The majority of flowmeter technologies operate on the principle of…

Metering Pumps

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A very common method for directly controlling low flow rates of fluids…

Use of Line Reactors

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Regulating the electric power sent to an electric motor is a task…

Self-balancing Pneumatic Instruments Principles

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A great many precision instruments use the principle of balance to…

P, I, and D Responses Graphed

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A very helpful method for understanding the operation of proportional,…

Heuristic PID Tuning Procedures

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In contrast to quantitative tuning procedures where definite numerical…

Feedforward Control

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“Feedforward” is a rather under-used control strategy…

Pneumatic PID Controllers

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

Periodic Table of the Ions

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Analysis of Practical Pneumatic Instruments

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

Using Manometers for Measuring Pressure

Textbook

A very simple device used to measure pressure is the manometer: a…

Phasor Analysis of Transformer Circuits

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

Teaching Technical Theory

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Learning is not merely a process of information transfer. It is first…

Fluid Power Systems

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Given the ability of pressurized fluids to transmit force over long…

Antennas and Resonant Circuits (Tank Circuits)

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

Limit, Selector, and Override Controls

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Another category of control strategies involves the use of signal…

Instrument and Process Equipment Symbols

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

Cascade Control

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

Relay Circuits and Ladder Diagrams

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Electromechanical relays may be connected together to perform logic…

Split-range Control

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There are many process control applications in the industry where it…

What is Internet Protocol (IP)?

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I remember first learning about the world-wide Internet, and wondering…

Active Reading and Outlining Documentation

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Learning from reading printed text is a kind of problem-solving…

Proximity Switches

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A proximity switch is one detecting the proximity (closeness) of some…

Understanding Electrical Power Grids

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The term “grid” refers to the conductors and equipment…

Electrical Resistance and Ohm’s Law

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

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

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

Dampers and Louvres

Textbook

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