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Ellipse® AHF Annular Flanged, Hot Tap Flow Meter
Ellipse® AHF Annular Flanged, Hot Tap Flow Meter
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Ellipse® AHF Annular Flanged, Hot Tap Flow Meter

Ellipse® AHF Annular Flanged, Hot Tap Flow Meter

The Ellipse® Model AHF annular flanged flow device is a hot tap 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


  • T-Type head, 316 SS 1/4 inch or 1/2 inch FNPT connection
  • CS 3000 lb weld fitting - ASTM A105
  • 316/316L SS Ellipse sensor
  • Instrument valves (2 per sensor) 1/4 inch or 1/2 inch, CS
  • 316 SS ID tag with wire
  • 150 lb 316/316L SS sensor flange
  • CS packing chamber with molythane or graphite packing gland
  • CS packing chamber flange, 150 lb with SS cap
  • 316 SS isolation ball valve, NPT threaded
  • CS threaded nuts and bolts
  • CS nipples, schedule 40
  • Available in 7/8, 1 ¼ & 2 ¼ inch diameters
  • Optional: 316 SS rods, bolts and nuts
  • Optional: 316 SS packing chamber and flange
  • Optional: Spiral wound gasket, 316 SS
  • Optional: 300 lb, 600 lb, and higher flange rating, CS or 316 SS ANSI B16.5
  • Optional: Temperature port with RTD output
  • Optional: Static pressure port with SS plug



2…48 in.
Temperature Range
Up to 800 °F
Flow Range
5.3…21,130 gpm
Pressure Range
Pressure and temperature depend on flange ratings PSI
±0.75 %

Additional Specifications

Application Examples


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

Product Resources

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