ADS Environmental Services Model 4000 530017 A0 - Manual (Page 24)

3-1
C H A P T E R 3
Monitor and Sensor Installation
The ADS Model 4000  flow monitor and sensors are primarily
designed for monitoring flow in sanitary and storm sewers. The
monitor mounts to the manhole rim or wall slightly below the
manhole cover.
A sewer system’s hydraulics are much more stable and uniform in
the incoming pipe than in the manhole invert or outgoing pipe.
Therefore, the sensors mount to a stainless steel expandable ring or
stainless steel bands installed in the sewer pipe a short distance
upstream from the manhole invert. Installing the sensors upstream
minimizes the hydraulic effects and erroneous data readings caused
by foamy waters, waves in the flow, sewer noise, non-laminar flow,
and obstructions in the manhole.
The process of installing the sensors in the incoming pipe is
patented by ADS
 .