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Instructions for Use SS 20.260
Page 7
EF
A
w
V
w
PF
w
D
A
N
N
N
N
2
4
Table 2 lists profile factors and volume flow measuring ranges (with cer-
tain sensor measuring ranges) for standard pipe diameters.
Table 2
Inner
Min. @
DN
[inch]
[mm]
PF
0,2 m/s
2,5 m/s
20 m/s
50 m/s
25
25
1
26.0
0.796
0.30
3.80
30.4
76.1
32
32,8
0.796
0.48
6.05
48.4
121
1 1/4
36,3
0.770
0.57
7.17
57.4
143
40
40
1 1/2
39,3
0.748
0.65
8.17
65.3
163
43,1
0.757
0.80
9.94
79.5
199
45,8
0.763
0.91
11.3
90.5
226
50
50
2
51,2
0.772
1.14
14.3
114
286
57,5
0.777
1.45
18.2
145
363
65
65
2 1/2
70,3
0.786
2.20
27.5
220
549
76,1
0.792
2.59
32.4
259
648
80
80
3
82,5
0.797
3.07
38.3
307
767
100
100
4
100,8
0.804
4.62
57.7
462
1.155
125
125
5
125,0
0.812
7.17
89.7
717
1.794
150
150
6
150,0
0.817
10.4
130
1.040
2.599
180
182,5
0.825
15.5
194
1.554
3.885
200
200
8
206,5
0.829
20.0
250
1.999
4.998
250
10
260,4
0.835
32.0
400
3.202
8.004
300
300
12
309,7
0.840
45.6
570
4.556
11.390
350
14
339,6
0.842
54.9
686
5.491
13.728
400
400
16
389
0.845
72.2
903
7.223
18.058
450
450
18
437
0.847
91.5
1.143
9.147
22.867
500
500
20
486
0.850
114
1.419
11.353
28.383
600
600
24
585
0.854
165
2.066
16.527
41.317
700
700
28
684
0.857
227
2.834
22.673
56.683
800
800
32
783
0.859
298
3.723
29.781
74.452
900
900
36
882
0.862
379
4.740
37.920
94.800
1000
1000
40
980
0.864
469
5.865
46.923
117.308
Nominal
size
Diameter of measuring pipe
Profile
faktor
Measuring range of volumetric flow [m
3
/h]
Norm value
@ sensor measuring range [m/s]
D
Inner diameter of pipe [m]
A
Cross-section area of pipe [m
2
]
N
w
Flow velocity in the middle of the pipe [m/s]
N
w
Average flow velocity in the pipe [m/s]
PF
Profile factor (for pipes with circular cross-sections)
EF
Measuring unit factor (conversion to non-SI units)
N
V
Standard volumetric flow [m³/s]