EF200W-C
9
Q
[m /h] =
Re = 5000
³
5000
[Pa
· · D [m] ·
· s]
i
π
μ
· 3600 [s/h]
4
[kg/m ]
·
³
ρ
Q
[ /h] =
Re = 5000
³
5000
[lbf
· · D [ft] ·
· s/ft ]
i
²
π
μ
· 60 [s/min]
4
[lbm/ ]
·
³
ρ
A0034302
Q
Re = 5000
Flow rate is dependent on the Reynolds number
D
i
Internal diameter of measuring tube (corresponds to dimension K→ See page 34)
µ
Dynamic viscosity
ρ
Density
The measuring signal must have a certain minimum signal amplitude so that the signals can be
evaluated without any errors. Using the nominal diameter, the corresponding flow can also be
derived from this amplitude. The minimum signal amplitude depends on the setting for the
sensitivity of the DSC sensor (s), the steam quality (x) and the force of the vibrations present (a). The
value mf corresponds to the lowest measurable flow velocity without vibration (no wet steam) at a
density of 1 kg/m
3
(0.0624 lbm/ft^3). The value mf can be set in the range from
6 to 20 m/s (1.8 to 6 ft/s) (factory setting 12 m/s (3.7 ft/s)) with the Sensitivity parameter (value
range 1 to 9, factory setting 5).
v
[m/s] = max
AmpMin
mf [m/s]
x²
AmpMin
x²
ρ
³
m ]
/
g
k
[
1
ρ
³
m ]
/
g
k
[
A0034303
v
AmpMin
Minimum measurable flow velocity based on signal amplitude
mf
Sensitivity
x
Steam quality
ρ
Density
Q
[m /h] =
AmpMin
³
v
[m/s]
AmpMin
· · D [m]
i
²
π
· 3600 [s/h]
4 ·
³]
m
/
g
k
[
ρ
³]
m
/
g
k
[
1
Q
[ /min] =
AmpMin
³
v
[ /s]
AmpMin
· · D [ft]
i
²
π
· 60 [s/min]
4 ·
0.0624 [lbm/ ]
³
A0034304
Q
AmpMin
Minimum measurable flow rate based on signal amplitude
v
AmpMin
Minimum measurable flow velocity based on signal amplitude
D
i
Internal diameter of measuring tube (corresponds to dimension K→ See page 34)
ρ
Density
