Badger Meter Model BAR - Manual (Page 3)

User Manual
Page 3 April 2014
INTRODUCTION
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 .
Impact velocity
sensing holes
True static
sensing holes
Figure 1: BAR Ellipse pressure sensing holes
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
Standard Components
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
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
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