Badger Meter AHR - Wet Tap, Low Pressure User Manual

Ellipse® Pitot Tube Meter

AHR Annular Low Pressure Wet Tap Meter

PTT-UM-00375-EN-03 (June 2014)

User Manual

Ellipse® Pitot Tube Meter, AHR Annular Low Pressure Wet Tap Meter

CONTENTS

Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Specications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Pipe Orientation and Sensor Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Installation Instructions, Single Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Installation Instructions, Double Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Location Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Flow Curve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

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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 AHR comes
with instrument shutoff valves with provisions to accept a transmitter or
direct indicating meter.

User Manual

True Static
Sensing Holes

Impact Velocity
Sensing Holes

Figure 1: AHR pressure sensing holes

SPECIFICATIONS

Applications Liquid (without system shutdown), air, gas

Pipe Sizes

Pressure

Temperature

Accuracy

Turndown Ratio

Standard Components

Reynolds Number

Resonance

2…48 inches (50…1220 mm)

150 psi (1034 kPa) maximum

150° F (66° C) maximum

±0.75% of reading

17:1 with no vacuum effect

T-type head, 316 SS 1/4" or 1/2" FNPT connection
CS compression fitting with SS ferrule
316 SS isolation ball valve, NPT
CD reducer coupling
CS 3000 lb weld fitting, ASTM A105
CS nipples, schedule 40
316 SS Ellipse sensor
316 SS ID tag with wire
Instrument valves (2 per sensor) 1/4" or 1/2", CS

Greater than 75,000 maintains most accurate flow measurements
Less than 75,000 consult factory for estimated results

If greater than 0.8, use double support.

Table 1: Specifications

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