IM-P736-02 EMM Issue 3
147
VLM30 In-Line Vortex Flowmeter
Flow measurement of gases and steam
Nominal
diameter
Flange
Minimum
Reynolds number
QmaxDN³ Frequency for Qmax⁴
Re1¹ Re2² [m³/h] [Usgpm] [Hz, ±5%]
DN25 (1")
DIN 6600 10000 150 88 2040
ASME 130 76 2960
DN40 (1½")
DIN 6750 10000 390 230 1580
ASME 390 230 2240
DN50 (2")
DIN 9950 20000 630 371 1310
ASME 630 371 1720
DN80 (3")
DIN 1300 20000 1380 812 820
ASME 1380 812 1120
DN100 (4")
DIN 16800 20000 2400 1413 640
ASME 2400 1413 850
DN150 (6")
DIN 26500 27000 5400 3178 430
ASME 5400 3178 540
DN200 (8")
DIN 27600 28000 9600 5650 350
ASME 9600 5650 420
DN250 (10")
DIN 41000 41000 16300 9594 290
ASME 16300 9594 320
DN300 (12")
DIN 48000 48000 23500 13832 260
ASME 23500 13832 270
1 Minimum Reynolds number from which the function takes effect. For accurate dimensioning of the
flowmeter, please use the Spirax Sarco sizing software.
2 Minimum Reynolds number from which the specified accuracy is achieved. Below this value, the
measuring error is 0.5% of Qmax.
3 Medium velocity approx. 90 m/s (295 ft/s).
4 For information only, precise values can be found in the test log delivered with the device.
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