Proline Prowirl 73 F, W
Endress+Hauser 3
Temperature measurement In addition to the volume flow the instrument measures the temperature. This measurement is performed
by a resistance thermometer Pt 1000 located close to the process in the DSC sensor's paddle (s. fig. Pt 1000
→ Page 2 ).
Flow computer The electronics of the measuring device is equipped with a flow computer. By means of this computer using
the primary measurands (volume flow and temperature) a variety of other process variables can be calculated,
e.g.:
• the mass and heat flow of saturated steam and water
• the mass and heat flow of superheated steam (at constant pressure)
• the mass and corrected volume flow of other gases (at constant pressure)
• the mass flow of any liquid
Diagnostics The device offers a wide variety of diagnostics, e.g. tracking of the temperature of media and ambient, as well
as extreme flow events etc.
Measuring system The measuring system consists of 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 (Flange version)
• Prowirl W (Wafer version)
Transmitter
• Prowirl 73
Input
Measured variable • Volumetric flow (volume flow)
is proportional to the frequency of vortex shedding after the bluff body.
• Temperature
can be available and used for the calculation of mass flow e.g..
The measured process variables volume flow and temperature or the calculated process variables mass flow,
heat flow or corrected volume flow can be configured as an output.
Measuring range The measuring range is dependant on the fluid and 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 indicates the ratio of a fluid's inertial forces to its viscous forces.
It is used to characterise the flow. The Reynolds number is calculated as follows:
F06-7xxxxxxx-19-xx-06-xx-000
Re = Reynolds number; Q = Flow; di = Internal diameter; m = Dynamic viscosity; r = Density
A0003239
Re
=
4Q·
pdi[m]·· m [Pa·s]
[m³/s] [kg/ ]·m³
r
v
DN 15...25
®
=
min.
6
r [kg/m³]
v
DN 40...300
® =
min.
7
r [kg/m³]
[m/s] [m/s]
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