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To select the meter size: See Figure 9.2 and find meter sizes within the velocity of 0.1 to 10 m/s for a specified
full-scale (measuring range high limit) flow. Select one that has its full-scale velocity
between 1 and 3 m/s.
Make sure the full-scale flow rate used for the final planning stage stays
within 10 m/s in terms of flow velocity.
10
-2
10
-1
110
1
10
2
10
3
10
4
15 25
40
50
65
80
100
150
200
250
300 350
400
450
mm10
1
0.3
0.1
流
速
(m/s)
流量〔 m
3
/h〕
Figure 9.2 Flow volume
Flow volume
Flow velocity range
Meter size
0.1m/s 0.3m/s 1m/s 10m/s
15mm
1/2”
0.06361(m
3
/h) 0.1908(m
3
/h) 0.6361(m
3
/h) 6.361(m
3
/h)
25mm
1”
0.1767 0.5301 1.767 17.67
32mm
1
1/4”
0.2895 0.8686 2.895 28.95
40mm
1
1/2”
0.4523 1.357 4.523 45.23
50mm
2”
0.7067 2.120 7.067 70.67
65mm
2
1/2”
1.195 3.583 11.95 119.5
80mm
3”
1.809 5.428 18.09 180.9
100mm
4”
2.827 8.482 28.27 282.7
125mm
5”
4.417 13.25 44.17 441.7
150mm
6”
6.361 19.08 63.61 636.1
200mm
8”
11.31 33.93 113.1 1131
250mm
10”
17.67 53.01 176.7 1767
300mm
12”
25.45 76.34 254.5 2545
350mm
14”
34.64 103.9 346.4 3464
400mm
16”
45.23 135.7 452.3 4523
450mm
18”
57.25 171.7 572.5 5725
500mm 20” － 212.1 706.9 7069
600mm 24” － 305.4 1018 10180
Flow volume (m
3
/h)
Flow velocity (m/s)
32
SI Uni
t