15 Libraries
108
UMFLUXUS_G8V4-6-1EN, 2018-10-10
15.3
Extended Library
15.3.1
Introduction
If the extended library is activated, it is possible to enter material and fluid properties as a function of the temperature or of
the pressure directly into the transmitter or by means of the program FluxKoef.
Enter only the properties needed for the measuring task.
The dependence of the material/fluid parameters on the temperature and pressure can be described
• as constants
• as linear function
• with polynomials of grade 1 to 4 or
• with customized interpolation functions.
In most cases, constants or a linear function are sufficient.
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 range 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.
Enter the density of the fluid. Press ENTER.
Tab. 15.2: Material and fluid parameters that can be stored
parameter
parameters necessary for...
material parameter
transversal sound speed
flow measurement
longitudinal sound speed
flow measurement
type of sound wave
flow measurement
typical roughness
profile correction of the flow velocity
fluid parameter
sound speed
start of the measurement
viscosity
profile correction of the flow velocity
density
mass flow rate calculation
gas compressibility coefficient
standard volumetric flow rate
Example:
The density of a fluid is unknown. If the mass flow rate is not measured, any constant value can be en-
tered as the density.
The measurement of the flow velocity and the volumetric flow rate will not be affected. However, the val-
ue of the mass flow rate will be wrong.
c-Medium range
auto
>USER<
c-Medium=400m/s
range +-150m/s
Kinem.Viscosity
1.01
mm2/s
Density
60.00 kg/m3
