10 Basic measurement FLUXUS F808, F809
UMFLUXUS_F808_8091V1-2-1EN, 2019-08-23 105
If Other Medium is selected or no data set for the selected fluid is stored in the transmitter, the fluid parameters have to
be entered first:
• average sound speed of the fluid
• range around the average sound speed of the fluid
• kinematic viscosity
• density
10.2.1 Sound speed
The sound speed of the fluid is used for the calculation of the transducer distance at the beginning of the measurement.
However, the sound speed has no direct influence on the measuring result. Often, the exact value of the sound speed for
a fluid is unknown. Therefore, a range of possible values for the sound speed has to be entered.
10.2.2 Kinematic viscosity
The kinematic viscosity has an effect on the flow profile of the fluid. The entered value and other parameters are used for
the profile correction.
10.2.3 Density
The density is used to calculate the mass flow (product of the volumetric flow rate and the density).
10.2.4 Fluid temperature
At the beginning of the measurement, the fluid temperature is used for the interpolation of the sound speed and thus, for
the calculation of the recommended transducer distance.
During the measurement, the fluid temperature is used for the interpolation of the density and the viscosity of the fluid.
10.2.5 Fluid pressure
The fluid pressure is used for the interpolation of the sound speed and the gas compressibility coefficient.
Enter the average sound speed of the fluid. Press ENTER.
This display will only be indicated if Other Medium is selected.
Select auto or user. Press ENTER.
auto: The area around the average sound speed is defined by the transmitter.
user: The area around the average sound speed has to be entered.
Enter the area around the average sound speed of the fluid. Press ENTER.
This display will only be indicated if user is selected.
Enter the kinematic viscosity of the fluid. Press ENTER.
This display will only be indicated if
Other Medium is selected.
Note! If the mass flow is not measured, press ENTER. The other measuring results will not be affected.
Enter the operating density of the fluid. Press ENTER.
This display will only be indicated if
Other Medium is selected.
Enter the fluid temperature. The value has to be within the operating temperature range of
the transducers. Press ENTER.
Enter the fluid pressure. Press ENTER.
This display will only be indicated if Special Funct.\SYSTEM settings\Dialogs/
Menus\Fluid pressure is activated.
c-Medium
1500.0 m/s
c-Medium range
auto >USER<
c-Medium=1500m/s
range +-150m/s
Kinem.Viscosity
1.00 mm2/s
Density
1.00 g/cm3
Medium Temperat.
20.0 C
Fluid pressure
1.00 bar
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