ADS Environmental Services FlowAlert QR 775011 A2 - Manual (Page 56)

Pressure Depth Sensor and Float Switch Installation 3-33
Desired orientation of pressure depth sensor and strap on wall
5. Remove the strap, and drill a ¼-inch hole 2 ½ inches deep at
the mark.
6. Install a ¼-inch x 2 ½-inch anchor bolt in the hole.
7. Place the strap on the anchor bolt, and then mark the wall
through the bottom hole of the strap.
8. Remove the strap, drill a ¼-inch hole 2 ½ inches deep at the
lower mark, and install a second anchor bolt.
9. Secure the pressure depth sensor to the strap with two 4-40 x
5/16-inch countersink screws. The sensor mounts
perpendicular to the strap.
Attaching the pressure depth sensor to the pressure mounting strap
10. Place the strap onto the anchor bolts in the wall, and secure the
strap to the bolts using the corresponding nuts and washers
until snug.
11. Measure and record the pressure depth sensor’s physical offset
for entry later into the Profile software. The physical offset is
the distance from the manhole invert (or bottom of wet well) to
the nose of the sensor.