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Sensor Installation and Connection 3-47
5. Secure the sensor cables along the downstream edge of the long
end of the band according to the instructions in
Securing the
Cables to the Band on page 3-51.
6. Make sure two pre-drilled holes are visible above the flow
surface on the short end of the band. Maneuver the band so
that the lowest hole is almost at the flow surface.
7. Mark the pipe wall through the lowest hole with a drill, and
install a ¼-inch x 2 ¼-inch (M6 x 55-mm) anchor bolt with a
pneumatic drill.
8. Secure the band to the anchor bolt with a washer and nut.
9. Conform the band to the pipe wall around to the long end of the
band so that it is flush with the pipe wall.
10. Install a ¼-inch x 2 ¼-inch (M6 x 55-mm) anchor bolt through
the pre-drilled hole closest to the flow surface on the long end
of the band, and secure the band with a washer and nut.
11. Make sure the band and sensors are flush against the pipe wall
with no gaps, and conform the rest of the band to the pipe wall.
12. Install ¼-inch x 2 ¼-inch (M6 x 55-mm) anchor bolts, nuts and
washers at the pre-drilled hole at the short end of the band and
at the pre-drilled holes along the long end of the band (above
the flow surface) approximately every 12 to 24 inches (305 to
610 mm) to the top end of the band.
13. Measure the physical offset for the sensor by manually
measuring the depth of the flow from the bottom of the pipe to
the flow surface and then measuring the distance from the
nose
(i.e., front end at the pipe surface) of the sensor to the flow
surface. Subtract the second measurement from the initial
depth of flow to determine the physical offset.
14. Run the sensor cables from the sensor location in the pipe to
the monitor location in the manhole according to the
instructions in
Securing the Sensor Cables in the Pipe and
Manhole on page 3-64.