2 3
SITRANS F M
3. Project guidance
3. Project guidance
3.1.1.
Sizing table
(DN 2 to DN 2000)
The table shows the relationship between flow velocity v, flow quantity Q and sensor dimension DN.
Guidelines for selection of sensor
Min. measuring range: 0 ... 0.25 m/s
Max. measuring range: 0 ... 10 m/s
Normally the sensor size is selected so that the nominal flow velocity v lies within the measuring
range 1 ... 3 m/s.
Flow velocity calculation formula:
V =
1273.24 x Q [l/s]
[m/s] or
DN
2
[mm]
Flow velocity calculation formula:
V =
0.408 x Q [GPM]
[ft/s] or
(Pipe ID)
2
[inch]
V =
283.67 x Q [MGD]
[ft/s]
(Pipe ID)
2
[inch]
V =
353.68 x Q [m
3
/h]
[m/s]
DN
2
[mm]
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