Some of the simplest types of digital communication networks found in industry are defined by the EIA…
Textbook
pH is the measurement of the hydrogen ion activity in a liquid solution. It is one of the most common forms of…
Textbook
“Polyphase” means “many phases,” describing a form of AC electrical system where…
Textbook
Imagine a liquid-level control system for a vessel, where the position of a level-sensing float directly sets…
Textbook
Any physical location in an industrial facility harboring the potential of explosion due to the presence of…
Textbook
A unique form of technical diagram for describing the abstract functions comprising a control system (e.g. PID…
Textbook
Displacer level instruments exploit Archimedes’ Principle to detect liquid level by continuously…
Textbook
By definition, a source is a device delivering energy into a system, while a load is a device extracting…
Textbook
Sample sizes of chemical substances are often measured in moles. One mole of a substance is defined as a…
Textbook
Process analyzers measure the concentration of specific substances for the purpose of measuring and/or…
Textbook
It is possible to convey electrical power and communicate analog information over the same two wires using 4…
Textbook
A 4 to 20 mA current signal represents some signal along a 0 to 100 percent scale. Usually, this scale is…
Textbook
Circuit breakers used in residential, commercial, and light industrial service are self-tripping devices: they…
Textbook
The transformer is one of the most important components in all of AC circuitry. Principally used to…
Textbook
There are many process control applications in the industry where it is desirable to have multiple control…
Textbook
An important performance parameter for transmitter instruments is something often referred to as turndown or…
Textbook
In contrast to quantitative tuning procedures where definite numerical values for P, I, and D controller…
Textbook
A very simple device used to measure pressure is the manometer: a fluid-filled tube where an applied gas…
Textbook
The reason why a pneumatic control valve’s stem position corresponds linearly to the amount of air…
Textbook
As described earlier in this chapter, calibration refers to the adjustment of an instrument so its output…
Textbook
Facebook
Google
GitHub
Linkedin