ADS Environmental Services FlowShark QR 775003 A2 - Manual (Page 74)

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 IS
ultrasonic depth, IS velocity, and IS 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.)