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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.


  • 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


  • Saturated or Superheated Steam
  • T-Type head, 316 SS 1/2" FNPT connection
  • CS compression fitting with SS ferrule
  • CS 3000 lb weld fitting - ASTM A105
  • 316 SS Ellipse sensor
  • 316 SS ID tag with wire
  • Optional: Double support, CS or 316 SS
  • Optional: Compression fitting - 316 SS
  • Optional: Temperature port with RTD output
  • Optional: Static pressure port with SS plug
  • Optional: 1/2" gate valves, OS & Y, 316 SS



2…72 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


Building Automation / HVAC
Chemical, Refining & Petrochemical
Oil & Gas
Process or Industrial
Water & Wastewater Treatment

Product Resources

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