ADS Environmental Services FlowShark Pulse QR 775004 A1 - Manual (Page 53)

6-8 ADS FlowShark Pulse O&M Manual
= Error! Changes in slope = changes in flow profile
= Distance depending on slope and flow velocity reading
l = min. 20 x diameter
Figure 6-7 Error caused by changes in slope
= Error! Installed in draw-down
Depth measurement may fail + velocity and depth measurement may be erroneous
? = Critical measurement point, not recommended! Flow begins to fall (or sink)
= Distance l = min. 5 x h
max
at place of installation
Figure 6-8 Error caused by changes in flow profile in front of slope fluctuation or fall
(1) = Fixtures such as samplers or similar
(2) = Obstruction
= Error! Caused by vorticity, tangential, and/or asymmetric flow
= Distance l
1
(upstream of obstruction) = minimum 5 x h
max
Distance l
2
(downstream of obstruction) = minimum 10 x h
max
in case of flow velocities >1 m/s
Figure 6-9 Errors caused by equipment or obstructions