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Installation
3.2 Mechanical installation
3.2.1 Site location guidelines
For best accuracy, install the sensor where the flow is not turbulent. An ideal location is in
a long, straight channel or pipe. Outfalls, vertical drops, baffles, curves or junctions cause
the velocity profile to become distorted.
Where there are outfalls, vertical drops, baffles, curves or junctions, install the sensor
upstream or downstream as shown in Figure 3 and Figure 4. For upstream locations,
install the sensor at a distance that is at least five times the pipe diameter or maximum
fluid level. For downstream locations, install the sensor at a distance that is at least ten
times the pipe diameter or maximum fluid level.
If the location contains a junction and the flow in one pipe is much higher, install the
sensor on the wall near the lower flow pipe.
Figure 3 Sensor location near an outfall, vertical drop or baffle
1 Acceptable upstream sensor location 5 Distance downstream: 10 x pipe diameter
2 Outfall 6 Vertical drop
3 Distance upstream: 5 x maximum level 7 Baffle
4 Acceptable downstream sensor location
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