Badger Meter AR - Regular (2 to 72")" - Manual (Page 3)

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 .
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
User Manual
Page 3 April 2014