Owner's manual

9. Install the instrument valves (optional) at the AF Ellipse head connections. Make sure the valves are FULLY CLOSED to
prevent them from leaking during startup.
INSTALLATION INSTRUCTIONS, DOUBLE SUPPORT
1. Follow steps 1 through 5 in “Installation Instructions, Single Support”. 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 deburr, 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
AF (7/8") 1/2" 1/2"
AF1 (1-1/4") 1" 7/8"
AF2 (2-1/4") 3" 2-3/4"
Table 3: Double support drill bit size
2. Weld the double support weld-o-let or thread-o-let making sure that it is centered with the drilled hole and the low point
on the bottom of the weld-o-let or thread-o-let is in line with the pipe centerline (1/16" weld gap recommended).
3. Install the AF Ellipse sensor through the two holes. Make sure that the double support pin passes through the guide ring.
See Figure 6.
Models AF & AF1
Ellipse Sensor
Thread-o-let
Double Support
Pin
Guide
Ring
Plug
Weld-o-let
Ellipse Sensor
Double Support
Pin
Guide
Ring
Cap
Model AF2
Figure 6: Double support pin
4. Align the arrow located on the sensor head in the direction of ow as in step 7, “Installation Instructions, Single Support” on
page 5.
5. Install and tighten all nuts and bolts (provided). Bolt torques should be in accordance with applicable standards.
6. Install the plug into the end of the double support thread-o-let* (weld on cap for AF2). Tighten the plug to
prevent leakage.
OTE:N * Use a thread sealant suitable for the process when making this connection.
Ellipse® Pitot Tube Meter, AF Annular Flanged Meter
Page 6 April 2014