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Atomic Theory and Chemical Symbols

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The three “elementary” particles of matter comprising all…

On/off Electric Motor Control Circuits

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

Industrial Instrumentation Summary for Teachers

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To summarize some of the key points and concepts for teaching: Do not…

Displacement and Displacer Level Instrumentation

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Displacer level instruments exploit Archimedes’ Principle to…

Cascade Control

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

Pneumatic Sensing Elements

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Most pneumatic instruments use a simple but highly sensitive mechanism…

Ultrasonic (Sound) Echo Level Measurement

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A completely different way of measuring liquid level in vessels is to…

FOUNDATION Fieldbus H1 Protocol Device Configuration and Commissioning

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Fieldbus devices require far more attention in their initial setup and…

Differential (87) Current Protection

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One of the fundamental laws of electric circuits is Kirchhoff’s…

Limit, Selector, and Override Controls

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Another category of control strategies involves the use of signal…

Glossary of Cyber-security Terms

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Cyber-security seems to have its own vocabulary, ranging from unwieldy…

Variable-area Flowmeters

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An variable-area flowmeter is one where the fluid must pass through a…

Measuring Electrical Conductivity

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The electrical conductivity of liquids is an important analytical…

Auxiliary and Lockout (86) Relays

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An important type of “accessory” relay, especially for…

Functional Diagrams: the Flow of Information within a Control System

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A unique form of technical diagram for describing the abstract…

Fiber Optic Data Communication

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

Self-regulating, Integrating, and Runaway Process Characteristics

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

Kirchhoff’s Current and Voltage Laws

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Two extremely important principles in electric circuits were codified…

Level Sensor Accessories

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Disturbances in the liquid tend to complicate liquid level…

Process Flow Diagrams

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To show a practical process example, let’s examine three…