Badger Meter BAR User Manual
Ellipse® Pitot Tube Meter
BAR Annular Commercial Meter
PTT-UM-00324-EN-02 (April 2014)
User Manual
Ellipse® Pitot Tube Meter, BAR Annular Commercial Meter
CONTENTS
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Specications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pipe Orientation and Sensor Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Installation Instructions, Single Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Installation Instructions, Double Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Preso Ellipse Location Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Flow Curve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Page ii April 2014
INTRODUCTION
Impact velocity
The Preso patented 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.
The BAR Ellipse comes with instrument shutoff valves with provisions to
accept a transmitter or direct indicating meter.
SPECIFICATIONS
Applications Liquids and gases
Pipe Sizes 2…24 in. (50…610 mm)
Pressure 400 psi (2760 kPa) maximum
Temperature 250° F (120° C) maximum
Accuracy ±0.75% of reading
Turndown Ratio 17:1 with no vacuum effect
Y-type head, brass 1/8 in. FNPT connection
Sensor connection:
2…5 in., Ellipse 1/2 in.; 1/2 in. brass compression fitting with SS ferrule
6…12 in., Ellipse 7/8 in.; 1 in. CS compression fitting with SS ferrule
Standard Components
Reynolds Number
Resonance If greater than 0.8, use double support
14…24 in., Ellipse 1-1/4 in.; 1-1/4 in. brass compression fitting with SS ferrule
CS 3000 lb thread fitting, ASTM A105
316/316L SS Ellipse sensor
Instrument valves (2 per sensor), 1/4 in. SAE flare brass ball type
Polycarbonate ID tag with wire
Greater than 75,000 maintains most accurate flow measurements
Less than 75,000 consult factory for estimated results
User Manual
sensing holes
True static
sensing holes
Figure 1: BAR Ellipse pressure sensing holes
Table 1: Specifications
Page 3 April 2014
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