2
Product Summary
Ellipse® Pitot Tube
AR – Annular Regular
This rugged general purpose flow meter
can be utilized to measure air, gas, and liquid.
Pipe Sizes: 2 to 115 inches (50 to 2921 mm)
Pressure: 800 PSI (5515 kPa) maximum
Temperature: 800 °F (426 °C) maximum
Integral manifold
valve option available
AF – Annular Flanged
The AF flow meter offers flanged connections
suitable to measure air, gas, and liquid.
Pipe Sizes: 2 to 115 inches (50 to 2921 mm)
Pressure: Vary per flange rating
Temperature: Vary per flange rating
Integral manifold
valve option available
ASF – Annular Steam Flanged
Similar in design to the AF Ellipse; the ASF
flow meter is used exclusively for steam applications.
Pipe Sizes: 2 to 115 inches (50 to 2921 mm)
Pressure: Vary per flange rating
Temperature: Vary per flange rating
Integral manifold
valve option available
AHF – Annular Flanged Hot Tap
The AHF flow meter offers flanged
connections suitable to measure air,
gas, and liquid and can be installed
without system shutdown.
Pipe Sizes: 2 to 72 inches (50 to 1829 mm)
Pressure: Vary per flange rating
Temperature: Vary per flange rating
Gear drive option available
Integral manifold
valve option available
AHR – Annular Low Pressure Wet Tap
Pipe Sizes: 2 to 72 inches (50 to 1829 mm)
Insertion Pressure: 75 PSI (517 kPa) maximum
Insertion Temperature: 120 °F (49 °C) maximum
Pressure: 150 PSI (1034 kPa) maximum
Temperature: 200 °F (49 °C) maximum
Integral manifold
valve option available
AS – Annular Steam
Similar in design to the AR Ellipse;
the AS flow meter is used exclusively
for steam applications.
Pipe Sizes: 2 to 115 inches (50 to 2921 mm)
Pressure: 600 PSI (4100 kPa) maximum
Temperature: 480 °F (250 °C) maximum
Integral manifold
valve option available
AHL – Annular Hot Tap
Hot tap model used on air, gas, and liquid
and can be installed without system shutdown.
Pipe Sizes: 2 to 72 inches (50 to 1829 mm)
Pressure: 800 PSI (5515 kPa) maximum
Temperature: 800 °F (426 °C) maximum
Gear drive option available
Integral manifold
valve option available
The Ellipse annular flow device is a primary flow meter designed to
produce a differential pressure that is proportional to flow. Its patented
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. As a result of this
innovative design, the Ellipse provides a true static pressure measurement
rather than a calculated value producing accuracies of ±0.75% of
reading, repeatability of ±0.1% of reading, and a 17:1 turndown ratio
with no vacuum effect. All Preso Differential Pressure Flow Meters can
be customized and built to meet the highest pressure and temperature
specifications. All models can also be supplied with RTDs and
transmitters to provide an economical mass flow
measurement solution.
