Proline Prowirl 72F, 72W, 73F, 73W
Endress+Hauser 5
Measuring system The measuring system comprises a sensor and a transmitter.
Two versions are available:
• Compact version: sensor and transmitter form a mechanical unit.
• Remote version: sensor is mounted separate from the transmitter.
Sensor
• Prowirl F (flanged version)
• Prowirl W (wafer version)
Transmitter
• Prowirl 72
• Prowirl 73
Input
Measured variable Prowirl 72
• Volumetric flow (volume flow) is proportional to the frequency of vortex shedding after the bluff body.
• The volume flow or, if process conditions are constant, the mass flow or corrected volume flow can be output
as the output variables.
Prowirl 73
• Volumetric flow (volume flow) is proportional to the frequency of vortex shedding after the bluff body.
• The temperature can be output directly and is used to calculate the mass flow for example.
• The measured process variables volume flow, temperature or the calculated process variables mass flow, heat
flow or corrected volume flow can be output as the output variables.
Measuring range The measuring range depends on the fluid and the nominal diameter.
Start of measuring range
Depends on the density and the Reynolds number (Re
min
= 4,000, Re
linear
= 20,000).
The Reynolds number is dimensionless and is the ratio of inertial forces to viscous forces of the fluid. It is used
for characterizing the flow. The Reynolds number is calculated as follows:
A0003794
Re = Reynolds number; Q = flow; di = internal diameter; m = dynamic viscosity, r = density
A0003239
Full scale value
• Gas/steam: v
max
= 75 m/s (DN 15: v
max
= 46 m/s)
• Liquids: v
max
= 9 m/s
Note!
By using the selection and planning program "Applicator", you can determine the exact values for the fluid you
use. You can obtain the Applicator from your Endress+Hauser sales center or on the Internet under
www.endress.com.
Re
=
4·Q · m³[m³/s] [kg/ ]
di [m] · µ · [Pa·s]
v
DN 15...25
=
min.
6
[kg/m³]
v
DN 40...300
=
min.
7
[kg/m³]
[m/s] [m/s]
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