Badger Meter Model BHR - Manual (Page 3)

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 . Model BHR comes
with instrument shutoff valves that can be plumbed to a transmitter or direct
indicating gauge .
True static
sensing holes
Impact velocity
sensing holes
Figure 1: BHR pressure sensing holes
SPECIFICATIONS
Applications Liquids and gases
Pipe Sizes 2…24 inches (50…610 mm)
Pressure 75 psi (517 kPa) maximum
Temperature 120° F (49° C) maximum
Accuracy ±0 .75% of reading
Turndown Ratio 17:1 with no vacuum effect
Standard Components Y-type head, brass 1/8" FNPT connection
Sensor connection:
2"…5", Ellipse 1/2"; 3/4" Brass compression fitting with SS ferrule
6"…12", Ellipse 7/8"; 1" Brass compression fitting with SS ferrule
14"…24", Ellipse 1-1/4"; 1-1/4" 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" SAE flare brass ball type
Polycarbonate ID tag with wire
Bronze isolation ball valve
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