EF200W-C
11
Ma
Mach number
v
Flow velocity
c
Sound velocity
The corresponding flow rate can be derived using the nominal diameter.
Q
[m /h] =
Ma = 0.3
³
0.3 · c [m/s] · · D [m]
i
²
π
4
· 3600 [s/h]
Q
[ /min] =
Ma = 0.3
³
0.3 · c [ft/s] · · D [ft]
i
²
π
4
· 60 [s/min]
A0034337
Q
Ma = 0.3
Restricted upper range value is dependent on Mach number
c
Sound velocity
D
i
Internal diameter of measuring tube (corresponds to dimension K→ See page 34)
ρ
Density
The effective upper range value Q
High
is determined using the smallest of the three values
Q
maxʼ
Q
AmpMax
and Q
Ma=0.3
.
Q
[m /h] = min
High
³
Q
[m /h]
max
³
Q
[m /h]
AmpMax
³
Q
[m /h]
Ma = 0.3
³
High
³
Q
[ /min]
max
Q
[ /min]
AmpMax
Q
[ /min]
Ma = 0.3
A0034338
Q
High
Effective upper range value
Q
max
Maximum measurable flow rate
Q
AmpMax
Maximum measurable flow rate based on signal amplitude
Q
Ma = 0.3
Restricted upper range value is dependent on Mach number
For liquids, the occurrence of cavitation may also restrict the upper range value.
Operable flow range
The value, which is typically up to 49: 1, may vary depending on the operating conditions (ratio
between upper range value and lower range value)
