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Ellipse AS Annular Steam Flow Meter

Ellipse AS Annular Steam Flow Meter

The Ellipse Model AS annular flow device is a steam flow meter designed to produce a differential pressure that is proportional to flow. Its innovative elliptical shape provides the lowest permanent pressure loss in the industry. The Ellipse flow meter is designed with a series of ports facing the upstream velocity pressures and flow sensing ports strategically located ahead of the trailing edge flow separation.


  • Patented elliptical design outperforms traditional devices
  • Turndown Ratio: 17:1; no vacuum effects
  • No moving parts equals long, trouble-free service life
  • True static pressure measurement rather than a calculated value
  • Overcomes loss of accuracy caused by fluid separation at the sensor body


  • Single point pipe entry for DP, temperature and static pressure
  • No dampening software required
  • Lowest pressure loss in industry (typically 3% of DP in a 12" line) due to its patented aerodynamic profile
  • NIST traceable calibration: Optional independent labs



2…48 in.
Temperature Range
Up to 480 °F
Flow Range
2.6…21,130 gpm
Pressure Range
Up to 600 PSI
±0.75 %

Additional Specifications

Application Examples


Chemical, Refining & Petrochemical
Oil & Gas
Process or Industrial
Water & Wastewater Treatment

Product Resources

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