Endress+Hauser Proline Prowirl F 200, Operating Instructions Manual

Page: 193 / 224

Proline Prowirl F 200 PROFIBUS PA Technical data
Hauser 193
Q
Re = 5000
Flow rate is dependent on the Reynolds number
Q
AmpMin
Minimum measurable flow rate based on signal amplitude
The Applicator is available for calculation purposes.
Upper range value
The measuring signal amplitude must be below a certain limit value to ensure that the
signals can be evaluated without error. This results in a maximum permitted flow rate
Q
AmpMax
:
Q [m /h] =
AmpMax
³
350 [m/s] · · D [m]
i
² π
· 3600 [s/h]
4 ·
ρ [kg/m ] ³
1 [kg/m ] ³
Q [ /min] =
AmpMax
!
³
1148 [
!
/s] · · D [ft]
i
² π
· 60 [s/min]
4 ·
ρ [lbm/ ] #³
0.0624 [lbm/ ]
!
³
A0034316
Q
AmpMax
Maximum measurable flow rate based on signal amplitude
D
i
Internal diameter of measuring tube (corresponds to dimension K)
ρ Density
For gas applications, an additional restriction applies to the upper range value with regard
to the Mach number in the measuring device, which must be less than 0.3. The Mach
number Ma describes the ratio of the flow velocity v to the sound velocity c in the fluid.
Ma =
v [m/s]
c [m/s]
Ma =
v [!/s]
c [!/s]
A0034321
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