ADS Environmental Services Model 4000 530017 A0 - Manual (Page 40)

Monitor and Sensor Installation 3-17
cable ties
Dryer
Tube
Properly securing the dryer tube to the monitor
4. Secure the sensor cable to the ring. Refer to Securing the
Cables to the Ring (or Band) on page 3-42 for instructions on
properly securing the cable.
Installing the Ring in the Manhole
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.
3. Place the ring in the input pipe at least 12 inches (30 cm)
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.