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Selection of the Measuring Point
 
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Distances between Measuring Point and Disturbance Source
In the following examples, recommended straight inlet and outlet pipe lengths are given for different types of flow disturbance sources to assist in selecting the correct measuring point.
D = Nominal pipe diameter at measuring point
L = Recommended distance
Disturbance source: 90 °-elbow
Inlet L>=10D
Outlet L>=5D
Disturbance source: 2 x 90 °-elbows in one plane
Inlet L>=25D
Outlet L>=5D
Disturbance source: 2 x 90 °-elbows in different planes
Inlet L>=40D
Outlet L>=5D
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