Manual

INSTALLATION INSTRUCTIONS, SINGLE SUPPORT
1. Choose the proper location to install the AHS Ellipse using AGA/ASME standards (or equivalent). See “Preso Ellipse Location
Instructions” on page 7.
2. Grind the surface of the pipe where the AHS 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 (1/16" weld gap recommended). Take
care to protect the threads during the welding process.
4. Thread the close nipple into the weld connector. Install the supplied three-piece isolating ball valve.
5. Mount the high pressure drilling machine onto the ball valve. Open the ball valve. Drill a hole through the pipe wall
according to Table 2 on page 5.
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.
Model / Sensor Weld Connector Drill Bit
AHS (7/8") 1-1/4" 1-1/8"
AHS1 (1-1/4") 1-1/2" 1-3/8"
Table 2: Single support drill bit size
6. Withdraw the drill bit through the isolating valve, close the valve and dismantle the drilling machine. Make sure there is no
leakage at the valve and close nipple connections. The valve is to remain completely closed until step 9.
7. Install the cage nipple, cage nipple assembly and packing gland with the threaded rods assembly by threading it into the
isolating valve. Align the arrow on the sensor head with the direction of ow. See Figure 4.
Field Weld
FLOW
Figure 4: Sensor alignment
8. Install the instrument valves at the AHS Ellipse head connections. Make sure the valves are fully closed to prevent them
from leaking upon startup. Install the cross tees.
9. Open the isolating ball valve. Insert the AHS Ellipse sensor into the pipe until it reaches the opposite pipe wall. This should
be done by turning the threaded insertion rods clockwise using a wrench.
10. Connect the instrument lines to the sensor head valves. In turn, connect these lines to a gage or transmitter.
11. Verify that the instrument valves are FULLY CLOSED. Remove the1/2" plugs from the top and side ports of the two (2)
forged cross tees.
12. Slowly pour water into the top ports of each forged cross tee until the system is full. Water will ow out of the side ports of
both crosses.
13. Reinstall the 1/2" plugs into the top and side ports. Ensure that they are secure. Then fully open the two (2) gate valves.
14. Allow condensation levels to stabilize 1/2 hour before taking instrument reading.
User Manual
Page 5 April 2014