ADS Environmental Services FlowShark QR 775002 A4 - Manual (Page 51)

Sensor Installation and Connection 3-17
Although the spreader mechanism fits snugly against the inside of
the ring, the spreader mechanism may seem loose on the hex nuts.
Do not be concerned. The spreader mechanism will tighten once the
ring is installed and tightened inside the pipe. The following picture
displays how a properly assembled ring should look.
Properly attached spreader mechanism
Mounting the Sensors to the Ring
The following sections provide instructions on mounting the
ultrasonic depth, velocity, and pressure depth sensors to the ring. To
ensure the most accurate flow data, standard pipe installations
require proper positioning of the sensors on the ring as well as in
the pipe. When facing the downstream edge of the ring, the sensors
should be mounted on the ring in the following locations:
 Ultrasonic Depth Sensor Twelve o'clock position (top of
the pipe) when the spreader mechanism is in the one o'clock
position
 Doppler Velocity Sensor As close as possible to the six
o'clock position (bottom), provided it is mounted above the
level of any silt present at the bottom of the pipe. (Any silt
covering the sensor could interfere with the sensor signals,
potentially producing inaccurate or erroneous readings.)