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Comment Automation & Control

Flowmeter Selection

By Chemical Engineering |

When a flowmeter is needed, the selection process should include studying the characteristics of respective measurement technologies and analyzing the advantages/disadvantages for different plant environments. This effort will help ensure that a meter with the right performance and reliability, for a particular installation, is selected. Some of the most common industrial flowmeter designs are described here. Differential Pressure A differential pressure meter operates by measuring the pressure differential across the meter and extracting the square root. These meters have a primary element that causes a change in kinetic energy, which in turn creates differential pressure in the pipe. A secondary element measures the differential pressure and provides a signal or readout, which is converted to the actual flow value. Two basic types of primary elements rely on this measurement: orifice plates and Venturi tubes. Both element types rely on the law of conservation of energy and Bernoulli’s energy equation to determine volumetric flowrates. Electromagnetic Electromagnetic meters (commonly referred to as “mag” meters), employ Faraday’s law of electromagnetic induction, which states that voltage will be induced when…
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