28 UMFLUXUS_G6V4-2EN, 2011-03-29
FLUXUS G60x 5 Selection of the Measuring Point
5.4 Selection of the Measuring Point Taking into Account the
Flow Profile and the Influence of Noise
• Select an area on the pipe where the flow profile is fully developed (see section 5.2).
• In this area, select the measuring point in such way that the influence of noise can be
neglected (see 5.3).
In consideration of the flow profile and the influence of noise, the measuring point can be
selected in the area 3...(7.5 - 2) D on the right side of pipe segment 2 (with max. distance
from the elbow). In the example, a distance of 36 D from the elbow was selected.
Tabelle 5.4
example:medium: natural gas
pipe material: stainless steel
length of pipe segment 1: 20 D
length of pipe segment 2: 20 D
number of sound paths: 2
• area with developed flow profile:
disturbance source: 90° elbow
recommended area for the measuring point: l 20 D (complete pipe segment 2) (see
Tab. 5.2)
• area with low influence of noise:
reflection point: flange
recommended area for the measuring point: l 3 D and outside of l = (7.5 ± 2) D on pipe
segment 2 (see Tab. 5.2)
Fig. 5.1: Area for the measuring point with a favorable flow profile and low influence of noise
20 D 20 D
36 D
(7.5 - 2) D
3 D
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