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Differential pressure measurement

Primary elements for flow measurement

Organes déprimogènsDifferential 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.


  • Suitable for liquids, gas et steam measurement
  • Robust : only mechanical without moving parts
  • Economical
  • 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.

Fuji Electric France helps you to choose the most suitable technology for your application

Primary elements
 Orifice plateIntegrated orifice plateVenturis and NozzlesPitot tubesV-ConeTM flowmeter

orifice plate




Pitot tubesV-ConeTM flowmeter
Diameter mini.DN501/2 NPTDN50DN50DN15
Diameter max.DN10001/2 NPTDN800DN1500DN3000
Static pressure max.500 bar160 barToute50 bar689 bar
Temperature max.200°C120°CToute500°C450°C
Reynolds numbers>2 500>2 500>20 000>12 000>4 000
Straight length
Accuracy± 1,5 %± 2 %± 1%± 1%± 0,5%
Load lossAverageAverageAverageLowLow
ApplicationsGas, steam, corrosive and non corrosive fluids