Hach Flo-Dar Sensor Basic User Manual page 23

Figure 18 Sensor offset
1 Distance from interior crown of pipe to top of frame
2 Pipe diameter
5.1.4 Measure the pipe diameter
The correct diameter of the pipe or channel is necessary for accurate flow calculations.
1. Measure the inside pipe diameter (ID) at three locations. Refer to
measurements are accurate.
2. Calculate the average of the three measurements. Record this number for use during the
software setup for the site.
3 Sensor offset
Figure 19. Make sure that the
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