Primary element flow meter for gas, steam and liquid

In fluid mechanics, a flow primary element is a device used to restrict the flow of a fluid while measuring the pressure difference. The main application is is flow measurement using a pressure transmitter differential pressure transducer. This measures the pressure on both sides of the orifice to calculate the flow rate. Orifice plates, nozzles, venturis, and V-cones are flow primary element. The conditions for their installation are described in ISO 5167 norms.

Differential pressure flow measurement is one of the most widely used measurement principles in the industry.

The main field of application is the measurement of water in heating and cooling circuits and the measurement of steam and condensates at very high temperatures in secondary circuits.

Features

• Suitable for liquids, gas et steam measurement
• Robust : only mechanical without moving parts
• Economic
• Easy maintenance : Associated electronics are out of the installation. No need to stop flow for equipment maintenance.
• Devices complying with International Standards
• Suitable for continuous flow monitoring
• Suitable for flow regulation

Measurement principle

The aim is to create a localized restriction of the section (or constriction), within the pipeline, which will generate a differential static pressure. Its measurement will allow the flow deduction.

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