ADS Environmental Services FlowShark QR 775003 A2 - Manual (Page 80)

Sensor Installation and Connection 3-23
Keep the following in mind:

Make sure the ultrasonic depth sensor is at the top (crown)
of the pipe, the Doppler velocity sensor is at the bottom of
the pipe above any silt present and below the flow surface
(during minimum flows), and the pressure depth sensor is
near the bottom.
Proper orientation of the ring with the sensors in the pipe with and without
silt present
 If necessary, temporarily clear away silt to install the ring.
Restore the silt after fully securing the ring (step 7).
 Make sure the ring is flat (flush) against the inside wall of
the pipe to avoid obstructing the flow or catching debris.
4. Expand the ring by turning the spreader mechanism nut
counter-clockwise with the crank handle or socket. However,
do not tighten the ring against the pipe completely at this
point.
5. Using the 24-inch carpenter’s level, orient the ultrasonic depth
sensor at the top of the pipe so that the sensor face is parallel
and level (from side to side) with the flow surface and pipe
crown.