Mounting the sensors to the ring – ADS Environmental Services FlowShark QR 775003 A2 User Manual

Page 74

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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.)

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