Proline Prowirl R 200 HART Technical data
Endress+Hauser 175
DN Liquids Gas/steam
[in] [ft³/min] [ft³/min]
3R, 4S 0.77 to 36 3.8 to 480
4R, 6S 1.7 to 81 8.6 to 1 100
6R, 8S 3 to 140 15 to 1 900
8R, 10S 6.8 to 320 34 to 4 300
Flow velocity
A0033468
D
i
Internal diameter of measuring tube (corresponds to dimension K)
v Velocity in measuring tube
Q Flow
The internal diameter of measuring tube D
i
is denoted in the dimensions as
dimension K.
For detailed information, see the Technical Information.→ 204
Calculation of flow velocity:
v [m/s] =
4 · Q [m /h]³
π · D [m]
i
²
·
1
3600 [s/h]
v [!/s] =
4 · Q [ /min]ft³
π · D [ft]
i
²
·
1
60 [s/min]
A0034301
Lower range value
A restriction applies to the lower range value due to the turbulent flow profile, which
increases only in the case of Reynolds 5 000numbers. The Reynolds number is
dimensionless and indicates the ratio of the inertia force of a fluid to its viscous force when
flowing and is used as a characteristic variable for pipe flows. In the case of pipe flows with
Reynolds numbers less than 5 000, periodic vortices are no longer generated and flow rate
measurement is no longer possible.
The Reynolds number is calculated as follows:
Re
=
4 · Q [m³/s] · [kg/m³]ρ
· D [m] · µ [Pa · s]π
i
Re
=
4 · Q [ft³/s] · [lbm/ft³]ρ
· D [ft] · µ [lbf · s/ft ]π
i
²
A0034291
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