Leak Testing - Dielectric TLP-8 Instruction Manual

4. Repeat for the remaining section(s).
5. Clamp the saddle mount to the power divider and mount on the tower central to
the antenna array.
6. Release the pressure and remove the gas cap from the section and the
corresponding cap on the power divider. Then connect the feed line matched marked
for that section.
Note: To ensure antenna performance the correct feed line must be connected
to the correct section and power divider output port. Observe the match
marking on sections, feed lines and power divider.
7. Repeat step 5 until all the feed lines are installed.
8. Remove the gas cap from the input section of the power divider and connect the
transmission line.
9. After the feed lines have been connected, fasten the rest of the line within the
supporting structure to eliminate damage. Use the "wrap-lock" clamps to fasten the
lines to the tower legs, diagonals, and horizontals or support mast.
C. Leak Testing
After the antenna is installed and all transmission lines are connected, check the
system for leaks.
1. Pressure the system using dry nitrogen or air from a compressor-dehydrator.
CAUTION
Using an air supply other than specified for transmission line, may contaminate
the transmission line system.
Note: Make sure a good quality gauge is used which read accurately in the 1-
20 psig (140 KPa) range, do not depend on the cylinder regulator gauge.
2. Pressurize the system to 6 psig.
3. Close the shutoff valve.
4. Give the system approximately one half hour to stabilize, and then record the
pressure and the temperature.
5. Wait twenty-four hours, and then read the pressure and the temperature again.
Use the following formula to obtain a corrected pressure for comparison:
PC=(PR+14.7)(T1+460)/(T2+460)-14.7
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