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Pressure Transmitter Basics: DP Transmitters

By Roberto Zucchi and Bill Simpson ABB Measurement Products |

Pressure transmitters are widely used throughout the chemical process industries (CPI). Although pressure in and of itself is an important process parameter, differential pressure (DP) measurements enable the inference of other important parameters as well. This article presents a concise overview of how DP transmitters can be put to work in CPI plants.   Definitions Here are some important common terms and their definitions. Atmospheric (barometric) pressure.This is the pressure that is exerted by the atmosphere surrounding the earth. Atmospheric pressure at sea level equals 14.695 psia. This value decreases with increasing altitude. Hydrostatic pressure. Hydrostatic pressure is encountered in liquid level applications. It is the pressure below the liquid surface exerted by the liquid above. Line, static or working pressure.Static pressure is the force per unit area exerted on a surface by the flow parallel to a pipe wall. Absolute pressure.Absolute pressure is a measurement referenced to a full, or perfect vacuum. Zero absolute pressure (0 psia) represents a total lack of pressure, such as occurs in outer space. Gage pressure.Gage pressure is a measurement referenced to atmospheric pressure.…
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