Badger Meter BHL User Manual
Ellipse® Pitot Tube Meter
BHL Annular Hot Tap Dual Rod Meter
PTT-UM-00516-EN-02 (April 2014)
User Manual
Ellipse® Pitot Tube Meter, BHL Annular Hot Tap Dual Rod Meter
CONTENTS
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Specications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pipe Orientation and Sensor Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Installation Instruction, Single Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Installation Instructions, Double Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Location Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Flow Curve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Page ii 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. Model BHL comes
with instrument shutoff valves that can be plumbed to a transmitter or direct
indicating gauge.
User Manual
True static
sensing holes
Impact velocity
sensing holes
Figure 1: BHL pressure sensing holes
SPECIFICATIONS
Applications Liquids and gases
Pipe Sizes 2…24 inches (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" FNPT connection
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
CS packing chamber with molythane packing gland
CS threaded rods, nuts and bolts
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
Page 3 April 2014
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