User Manual

Ellipse® Pitot Tube Meter, AHL-GD Dierential Pressure Flow Meter
Page 6 April 2014
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. 3/8 in.
AHL-GD(1-1/4 in.) 1 in. 7⁄8 in.
Table 3: Double support drill bit size
2. Weld the double support thread-o-let making sure that it is centered with the drilled hole (1/16 in. weld
gap recommended).
3. Install the AHL-GD Dierential Pressure Flow Meter sensor through the two holes. Make sure that the double support pin
passes through the guide ring. See Figure 5.
Ellipse Sensor
Double Support Pin
Guide Ring
Figure 5: Double support installation
4. Align the arrow located on the sensor head in the direction of ow as shown in Figure 4.
5. Ensure that the AHL-GD Dierential Pressure Flow Meter is in the correct orientation and spans the inside of the pipe.
Tighten the threaded insertion rods until the sensor reaches the other end of the pipe.
6. Install the plug into the end of the double support thread-o-let. Tighten the plug to prevent leakage.