ADS Environmental Services IETG FlowHawk QR 775012 A4 - Manual (Page 84)

Sensor Installation and Connection 3-25
4. Use the diagonal cutters to cut off the excess portion of the
cable ties.
Mounting the Surface Combo Sensor or
Ultrasonic Depth Sensor
The Surface Combo Sensor/Ultrasonic Depth Sensor is not
mounted prior to installation of the ring. The ring mechanism and
sensor mounting plate are assembled as detailed in Assembling the
Ring on page 3-11. After the ring is installed at the monitoring site,
the sensor is inserted into the mounting plate and leveled
(described in the following section).
Installing the Ring in the Pipe
The ring must fit securely in the pipe with the sensors properly
positioned to ensure the most accurate monitoring results. Install
the ring in the pipe in the following way:
1. Examine the pipe for possible obstructions to the flow or
inhibitors to ring installation.
2. Adjust the ring size to slightly less than the pipe diameter
before placing the ring in the pipe by turning the spreader
mechanism adjustment nut clockwise to contract it.
3. Place the ring in the input pipe at least 305 mm upstream from
the manhole or edge of the pipe with the sensors facing
upstream toward the oncoming flow. It must be located far
enough upstream from the manhole to minimize the effect of
the draw-down caused by a possible drop in the manhole
invert.