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The International System of Units

Textbook

The very purpose of physics is to quantitatively describe and explain…

Periodic Table of the Elements

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All substances are comprised of various elements in various…

Flow Measurement from Differential Pressure

Textbook

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

Limit, Selector, and Override Controls

Textbook

Another category of control strategies involves the use of signal…

Vibration Physics

Textbook

One very convenient feature of waves is that their properties are…

Digital Representation of Numerical Data

Textbook

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

Mechanical Vibration Switches

Textbook

A much simpler alternative to continuous vibration sensors…

Valve Seat Leakage

Textbook

In some process applications, it is important that the control valve…

What is Internet Protocol (IP)?

Textbook

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

Calibration Standards to Produce and Measure Physical Quantities

Textbook

As previously defined, calibration refers to the checking and…

Difference Between Calibration and Re-ranging

Textbook

What is Calibration? To calibrate an instrument means to check and…

Tuning PID Controllers

Textbook

Learning how to tune PID controllers is a skill born of much practice.…

Numerical Differentiation

Textbook

As we have seen, the concept of differentiation is finding the…

Conservation Laws

Textbook

The Law of Mass Conservation states that matter can neither be created…

Actuator Bench-set

Textbook

Valve actuators provide force to move control valve trim. For precise…

Principles, not Procedures

Textbook

One of the marks of a successful problem-solver is a habit of applying…

Safety Instrumented Functions and Systems

Textbook

A Safety Instrumented Function, or SIF, is one or more components…

Transformer Basics and Principles of Operation

Textbook

The transformer is one of the most important components in all of AC…

Cascade Control

Textbook

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

Classified Areas and Electrical Safety Measures

Textbook

Any physical location in an industrial facility harboring the…