Flow, by definition, is the passage of material from one location to…
An on/off valve is the fluid equivalent of an electrical switch: a…
One of the fundamental laws of electric circuits is Kirchhoff’s…
This section does not describe a particular type of flowmeter, but…
Sometimes we encounter a diversity of instrument signal standards in…
Diagnostic ability is arguably the most difficult skill to develop…
A completely different way of measuring liquid level in vessels is to…
The key to understanding how three-phase electric motors work is to…
In addition to Ohm’s Law, we have a set of rules describing how…
It is possible to convey electrical power and communicate analog…
An important design parameter of a control valve is the position it…
Solids tend to expand when heated. The amount that a solid sample will…
A limit switch detects the physical motion of an object by direct…
The electrical conductivity of liquids is an important analytical…
A technological advance introduced in the late 1980’s was HART,…
Regulating the electric power sent to an electric motor is a task…
Impedance in a series circuit is the orthogonal sum of resistance and…
In the United States, the most common language used to program PLCs is…
This animation shows the basic operation of a gas chromatograph,…
Weight-based level instruments sense process level in a vessel by…
