ADS Environmental Services IETG FlowHawk QR 775012 A4 - Manual (Page 60)

3-1
C H A P T E R 3
Sensor Installation and
Connection
The IETG FlowHawk ™ flow monitor and sensors are primarily
designed for monitoring flow in sanitary, storm, and combined
sewers. The monitor mounts to the manhole wall or rim slightly
below the manhole cover or to a rung in the manhole.
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.
Following is the basic procedure for installing the FlowHawk
monitor and sensors at a location:
 Investigate the Site Characteristics These
characteristics include pipe size and shape, silt level, flow
depth, and hydraulic conditions.
 Prepare the Equipment for Installation The monitor,
communication module, and sensors must be prepped and
tested for installation (See Chapters 4, 5, and 6 for
communication and initial monitor setup).