The American School of Gas Measurement Technology (ASGMT) has been at the forefront of Flow Measurement training since its inception in 1966. Over the years, ASGMT has evolved to encompass comprehensive training in both gas and liquids measurement. With a commitment to excellence, ASGMT now offers an extensive curriculum comprising over 115 lecture classes, complemented by 48 Hands-On Product Training sessions led by industry experts.

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INTRODUCTION TO DIFFERENTIAL PRESSURE PRODUCING PRIMARY FLOW ELEMENTS

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May 19, 2017

Flow is one of the four major physical measurements in processes. Flow meters may be classified in four categories: differential pressure, velocity, mass and positive displacement or volumetric. Each category has advantages and disadvantages; however, the focus of this paper will be the differential pressure flow meters.
Differential pressure (dP) flow meters include flow elements such as the orifice plate, venturi, flow nozzle, wedge meter, cone meter and proprietary devices. The elbow flow meter, pitot and annubar are also differential type flow meters, but have a different operating principle than the others and are outside of the scope of this paper. These meters may be referred to as flow elements (FE) or primary flow elements. These flow elements are called primary because an additional or secondary device must be attached to indicate the measured differential pressure. This secondary device may be an electronic transmitter, manometer, standpipe or gage.

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