Using filter cells to eliminate wavelengths associated with…
There are multiple motives for compromising the security of an…
A much simpler alternative to continuous vibration sensors…
Nearly every technical course teaches and tests students on…
A variety of problem-solving techniques have been presented for…
The efficient identification and correction of instrument calibration…
A control strategy similar to ratio control is relation control. This…
Two extremely important principles in electric circuits were codified…
Three-phase AC is the dominant mode of electric power generation and…
A 4 to 20 mA current signal represents some signal along a 0 to 100…
Certain types of nuclear radiation easily penetrates the walls of…
This section does not describe a particular type of flowmeter, but…
A limit switch detects the physical motion of an object by direct…
Sensors used to measure vibration come in three basic types:…
A pneumatic controller receives a process variable (PV) signal as a…
There is much to be said for neatness of assembly in electrical signal…
The three “elementary” particles of matter comprising all…
Take for instance the problem of measuring fluid flow through a pipe.…
Imagine a liquid-level control system for a vessel, where the position…
A special type flowmeter suited for powdered or granular solids is the…
Displacer level instruments exploit Archimedes’ Principle to…
Any conductor possesses a characteristic called inductance: the…
A completely different way of measuring liquid level in vessels is to…
Before we begin our discussion on process control, we must define a…
Instrument technicians should not have to concern themselves over the…
Volumes could be written about poor diagnostic technique. The…
Labwork is an essential part of any science-based curriculum. Here,…
Modern analog-to-digital converters are phenomenally accurate,…
To summarize some of the key points and concepts for teaching: Do not…
The next level of detail is the Process and Instrument Diagram, or…
A proximity switch is one detecting the proximity (closeness) of some…
As we have seen, feedforward control is a way to improve the stability…
Classical mechanics (often called Newtonian mechanics in honor of…
“Feedforward” is a rather under-used control strategy…
An important legacy technology for all kinds of continuous measurement…
A vertical column of fluid generates a pressure at the bottom of the…
Another category of control strategies involves the use of signal…
Some analyzers measure the composition of a process stream by directly…
Imagine a liquid-level control system for a vessel, where the position…
Although it seems each model of PLC has its own idiosyncratic standard…
This section does not describe a particular type of flowmeter, but…
