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Primaries / Differential pressure devices


  •  Mounting between flanges
  •  with welded connections
Orifice with annular chamber or single tappings 
Metering pipe with orifice plate, annular chamber or single tappings 

Flanged orifice plate with flange tappings 
Venturi nozzle 
Classical venturi


 Nominal Sizes From DN 10 to DN 1000 
From ½ inch to 40 inches
 Temperature Range From -60 to 570 °C 
From -76 to 1058 °F
 Operating Pressure Max. 315 bar 
Max. 4570 psi
 Process Connections Thread G½ and ½-14 NPT 
cutting ring 
 Orifice Material 1.7335, 1.4404. 1.4571, 1.4576 and further materials on request



  • Differentiall pressure measurement is a universal flow measurement for liquids, gases and vapors. Differential pressure flow meter always provide accurate results even with large bores, high temperature and extreme pressure.
  • Primary differential pressure devices, like SITRANS F O orifice, are standardized mechanical flow sensors according DIN EN ISO 5167 which are used for volume and mass flow measurement. The SITRANS F O orifice are suitable for non-corrosive and corrosive gases, vapors and liquids; permissible operating temperature -60 to +570 °C. The created differential pressue will be converted with the help of adifferential pressure transmitter SITRANS Pdelta P into a proportional flow signal. For calculation of the SITRANS F O orifice to DIN EN ISO 5167 is an completed filled out questionnaire necessary.

Differntial pressure flow meter application examples: Power stations, Petrochemical industry, Chemical industry


  • Orifice flowmeters are very robust and can be used in a wide range of nominal diameters
  • Suitable for wide ranges of temperature and pressure
  • No calibration required as the process is standardized
  • The electronics required in addition can be used over a long distance from the measuring location
  • The differential pressuremeasurement is well known and has a large installed base