Ellipse® Pitot Tube Meter AHL-GD Differential Pressure Flow Meter ERS MET FLOW W/O L WAL /β MOD ID DIA/ CAP SCH/ DP TAG PTT-UM-00327-EN-02 (April 2014) User Manual
Ellipse® Pitot Tube Meter, AHL-GD Differential Pressure Flow Meter CONTENTS Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
User Manual 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.
Ellipse® Pitot Tube Meter, AHL-GD Differential Pressure Flow Meter PIPE ORIENTATION AND SENSOR MOUNTING H FLOW L FLOW METERS W/O MOD/β DIA/ID CAP DP TAG FLOW METERS W/O MOD/β DIA/ID CAP DP TAG SCH/WALL SCH/WALL 10° 10° Field Weld Lock Nuts Field Weld 10° 10° FLOW METERS W/O MOD/β DIA/ID CAP DP TAG H FLOW FLOW METERS W/O MOD/β DIA/ID CAP DP TAG SCH/WALL Air, Gas, or Liquid with Proper Bleeding SCH/WALL L Liquid Figure 2: Horizontal pipe installation FLOW FLOW or 5° Max. 5° Max.
User Manual INSTALLATION INSTRUCTIONS, SINGLE SUPPORT 1. Choose the proper location to install the AHL-GD Differential Pressure Flow Meter using AGA/ASME standards (or equivalent). Refer to the location diagrams Figure 2, Figure 5 and Figure 6. 2. Grind the surface of the pipe where the AHL-GD Differential Pressure Flow Meter is to be inserted to provide a clean area for welding. 3. Weld the supplied thread-o-let to the pipe using standard codes for your application (1/16 in. weld gap recommended).
Ellipse® Pitot Tube Meter, AHL-GD Differential Pressure Flow Meter INSTALLATION INSTRUCTIONS, DOUBLE SUPPORT 1. Follow steps 1 through 6 in the single support section. At 180° from and on the same plane as the previously drilled hole, grind the surface of the pipe to provide a clean area for welding. Drill a hole and de-burr, especially on the inside of the pipe. The hole used for the double support should be sized according to Table 3. Model/Sensor Weld Connector Drill Bit AHL-GD (7⁄8 in.) 1/8 in.
User Manual LOCATION INSTRUCTIONS 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.
FLOW CURVE 4 3 2 12" 16" 20" 14" 18" 24" 30" WATER 60 °F 5 6 789 100000 5" 6" 2 3 8" 4 10" 5 6 789 10000 USGPM 2" 2 2.5" 3 4 3" 3.5" 4" 5 6 789 1000 5 6 789 1 .2 .3 .4 2 1 .9 .8 .7 .6 .5 3 2 4 3 4 5 6 10 9 8 7 NOTE: 2…10 in. CURVES ARE FOR SCHEDULE 40 PIPE 12 in. AND ABOVE ARE FOR SCHEDULE STANDARD PIPE 2 20 – ES O 40 30 ∆P INC H 2 ANNULAR ELLIPSE ® 10 OF H 100 90 80 70 60 50 3 4 5 6 789 100 Figure 7: Pressure drops Control. Manage. Optimize.
