AR - Regular
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Ellipse® Pitot Tube Meter
AR Annular Regular Meter
FLOW METERS
DEBITMETERS
MEDIDOR DE FLUJO
PTT-UM-00521-EN-02 (April 2014)
User Manual
Ellipse® Pitot Tube Meter, AR Annular Regular Meter
CONTENTS
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Specications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pipe Orientation and Sensor Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Installation Instructions, Single Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Installation Instructions, Double Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Location Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Flow Curve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Page ii April 2014
INTRODUCTION
The Preso elliptical design outperforms and provides greater accuracy than
traditional differential pressure flow measurement devices. This differential
pressure flow meter is designed with a series of ports facing the upstream
velocity pressures, as well as flow sensing ports strategically located ahead of
the trailing edge flow separation.
The multi-ported, self-averaging flow element consists of an elliptical shape
with two independent flow sensing chambers. The impact velocity sensing
holes (high pressure) are located along the leading edge and the true static
sensing holes (low pressure) are on the exterior probe side. Model AR comes
with instrument shutoff valves with provisions to accept a transmitter or direct
indicating meter.
User Manual
True static
sensing holes
Impact velocity
sensing holes
Figure 1: AR pressure sensing holes
SPECIFICATIONS
Applications Liquids and gases
Pipe Sizes 2…72 inches (50…1820 mm)
Pressure 800 psi (5515 kPa) maximum
Temperature 800° F (426° C) maximum
Accuracy ±0.75% of reading
Turndown Ratio 17:1 with no vacuum effect
Standard Components T-type head, 316 SS 1/4" or 1/2" FNPT connection
CS compression fitting with SS ferrule
CS 3000 lb weld fitting, ASTM A105
316/316L SS Ellipse sensor
Instrument valves (2 per sensor), 1/4", CS
316 SS ID tag with wire
Reynolds Number Greater than 75,000 maintains most accurate flow measurements
Less than 75,000 consult factory for estimated results
Resonance If greater than 0.8, use double support
Table 1: Specifications
Page 3 April 2014
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