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
Specications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pipe Orientation and Sensor Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Installation Instructions, Single Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Installation Instructions, Double Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Location Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Flow Curve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
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 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
Page 3 April 2014
Ellipse® Pitot Tube Meter, AHR Annular Low Pressure Wet Tap Meter
PIPE ORIENTATION AND SENSOR MOUNTING
Figure 2: Orientation and mounting
INSTALLATION INSTRUCTIONS, SINGLE SUPPORT
1. Choose the proper location to install the AHR Ellipse using AGA/ASME standards (or equivalent). See “Location Instructions”
on page 6.
2. Grind the surface of the pipe where the AHR Ellipse is to be inserted to provide a clean area for welding.
3. Weld the supplied weld-o-let to the pipe using standard codes for your application. Protect the threads during the
welding process.
4. Thread the close (short) nipple into the weld connector. Install the supplied 3-piece isolating ball valve.
5. Open the isolating ball valve. Mount the high-pressure drilling machine onto the ball valve. Drill a hole through the pipe
wall according to the following table.
Model / Sensor Weld Connector Drill Bit
AHR (7/8") 1-1/4" 1-1/8"
AHR1 (1-1/4") 1-1/2" 1-3/8"
OTE:N There is no need for a drilling machine if it is not a hot tap installation or if the system is not pressurized.
6. Withdraw the drill bit through the isolating ball valve. CLOSE the ball valve and dismantle the drilling machine. Make sure
there is no leakage at the valve and close nipple connections. The ball valve is to remain completely closed until step 10.
7. Thread the supplied cage (long) nipple into the isolating ball valve. Install the supplied reducer (1-1/4" x 1" coupling) on
the cage nipple.
8. Thread the supplied packing gland onto the reducer.
9. Install the instrument valves (optional) at the pressure connections on the AHR head. Make sure the valves are FULLY
CLOSED before proceeding.
10. Insert the Ellipse AHR through the packing gland and cage nipple until it reaches the isolating ball valve. Slightly tighten
the compression nut of the packing gland and attach the safety chain to the AHR. Open the isolating ball valve and push
the sensor down by hand until it reaches the opposite side of the pipe.
Page 4 April 2014
User Manual
THE ELLIPSE AHR MUST BE MANUALLY HELD IN ITS FULLY INSERTED POSITION UNTIL THE COMPRESSION NUT HAS
BEEN COMPLETELY TIGHTENED IN STEP 11 AND THE SAFETY CHAIN HAS BEEN PROPERLY ATTACHED.
11. While holding the Ellipse AHR in its fully inserted position, align the arrow on the sensor head with the ow direction.
Figure 3: Sensor alignment
12. Completely tighten the packing gland to prevent leakage.
13. Connect the instrument lines to the sensor head valves, then connect the lines to a gage or transmitter.
INSTALLATION INSTRUCTIONS, DOUBLE SUPPORT
OTE:N For non-hot tap installations only.
1. Follow steps 1 through 10 under “Installation Instructions, Single Support” on page 4. Size the hole used for the double
support according to the following table.
Model / Sensor Weld Connector Drill Bit
AHR (7/8") 1/2" 1/2"
AHR1 (1-1/4") 1" 7/8"
2. Weld the double support weld-o-let making sure that it is centered with the drilled hole.
3. Install the Ellipse AHR sensor through the two holes. Make sure that the double support pin passes through the guide ring.
See Figure 4.
Ellipse Sensor
Double Support Pin
Guide Ring
Figure 4: Double support pin
4. Align the arrow on the sensor head with the direction of ow as in step 11, “Installation Instructions, Single Support” on
page 4.
5. Check that the AHR Ellipse is in the correct orientation and spans the inside of the pipe. Tighten the compression nut
manually. Using a wrench, tighten the compression nut an additional 1-1/4 turns.
6. Install the plug into the end of the double support weld-o-let. Tighten the plug to prevent leakage.
Page 5 April 2014
TYPICAL INSTALLATION ORIENTATION
Ellipse® Pitot Tube Meter, AHR Annular Low Pressure Wet Tap Meter
LOCATION INSTRUCTIONS
Straight pipe requirements: Accuracy is affected by the piping configurations due to the disturbances of the flow profile. A
fully developed symmetrical flow profile is achieved with the minimum upstream and downstream recommended lengths.
DISTANCES ARE EXPRESSED IN
NUMBER OF NOMINAL PIPE DIAMETERS
THROTTLED VALVE OR REGULATOR TWO ELBOWS IN DIFFERENT PLANES
CHANGE IN PIPE SIZETWO ELBOWS IN THE SAME PLANE
A SINGLE ELBOW
Figure 5: Location instructions
Page 6 April 2014
FLOW CURVE
ANNULAR ELLIPS
1
.9
.6
.5
12" 16" 20"
User Manual
2 3 4 5 6 7 8 9 1
0
0
0
0
WATER 60° F
2 3 4 5 6 7 8 9 1
0
0
0
0
0
E
2" 2.5" 3.5"3" 4" 5" 6" 8" 10" 14" 18" 24" 30"
100
90
80
70
60
50
40
30
20
O
2
10
9
8
7
6
5
4
3
2
Figure 6: Flow curve
2 3 4 5 6 7 8 9 1
0
0
0
USGPM
2 3 4 5 6 7 8 9 1
0
0
0
∆P – INCHES OF H
.4
.3
.2
.8
.7
2 3 4 5 6 7 8 9 1
NOTE:
2" THRU 10" CURVES ARE FOR SCH. 40 PIPE
12" AND ABOVE ARE FOR SCH. STD. PIPE
1
Page 7 April 2014
Control. Manage. Optimize.
PRESO and ELLIPSE are registered trademarks of Badger Meter, Inc. Other trademarks appearing in this document are the property of their respective entities. Due to continuous
research, product improvements and enhancements, Badger Meter reserves the right to change product or system specications without notice, except to the extent an
outstanding contractual obligation exists. © 2014 Badger Meter, Inc. All rights reserved.
www.badgermeter.com
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