ADS Environmental Services Portable FlowShark Pulse QR 775006 A2 - Manual (Page 40)

Installation 3-3
Sensor Installation
Please observe all regulations regarding safety at work and
dangers due to explosive gases prior to the beginning of
installation activities. Take the appropriate security measures as
required.
Choosing a Suitable Location for Sensor Installation
Clear and stable hydraulic conditions are essential for obtaining accurate sensor
measurements. Therefore, consider the following when inspecting the physical and
hydraulic conditions at all potential installation locations:
 Strictly avoid locations experiencing or near falls, draw-downs, steps, curves,
obstructions, pipe joints, or changes in profile or immediately upstream or
downstream of inlet or lateral connections.
 Choose a location where sedimentation (e.g., sand, grit, or sludge) does not
develop under normal flow conditions. Sedimentation can accumulate due to
friction in pipes at locations exhibiting minimal or negative slope or structural
deficiencies that create obstructions or pockets. Typically, channels that
regularly exhibit flow velocities of more than 2 feet per second will not
experience a build-up of sediment.
 Avoid measuring flow depth in closed pipes that remain at least 80 percent
full under normal flow conditions. These sites can fill up completely during
elevated or peak flows, potentially resulting in backup or surcharge
conditions.
 Avoid locations that exhibit significant changes in slope.
 In general, make sure the distance of the upstream approach to the sensor is
equal to at least 5 times the approximate diameter of the pipe and the distance
downstream from the sensor is equal to at least 2 times the approximate
diameter of the pipe. Consider longer sections when turbulent hydraulic
conditions generate irregular flow profiles.
The following figures provide examples of appropriate and problematic sensor
installations. Please contact your ADS representative for assistance in selecting an
appropriate location or in assessing potential locations for installing sensors to ensure
accurate flow measurements. Forward any applicable drawings and/or photos.
The following examples apply only to wedge and pipe insertion
sensors.