Sensor Installation and Connection 5-35
7. Fully tighten the ring until it fits securely and completely flush
against the pipe wall.
Warning: Avoid over-tightening the ring. This could
bend the crank assembly.
8. Install an anchor bolt in the manhole wall just above the pipe
crown. Using an anchor cable tie, secure the Surface Combo
sensor cable.
9. Restore any silt moved to its previous level and confirm that
the Peak Combo sensor is still above the silt level.
10. Measure the physical offsets for the sensors in the following
way.
AV|Gated Sensor Since the AV|Gated sensor is always
installed as close to 0 degrees rotation as possible, there
should be no Physical Offset for this sensor unless a Silt
Mount Adapter is being used.
AV|Max/Peak Combo Sensor Physical Offset
Manually measure the depth of the flow from the bottom
of the pipe to the flow surface, and then measure the
distance from the nose (i.e., front end) of the
AV|Max/Peak Combo sensor to the flow surface. Subtract
the second measurement from the initial depth of flow to
determine the physical offset.
Physical Offset Measurement with Silt Mount
Adapter Manually measure the depth of the flow from
the bottom of the pipe to the flow surface, and then slowly
move the measuring device along the left-side of the ring
until it reaches the edge of the Silt Mount Adapter.
Measure the depth of flow at this point. Subtract the
second measurement from the initial depth of flow to
determine the physical offset.
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