Flow-X─ Function Reference
4-231
Flow-X General functions - fxISO5167_Venturi
1: Upstream
Input 'Density' represents the
density at the upstream pressure
tapping (
1
).
2: Downstream
Input 'Density' represents the
density at the downstream tapping
(
2
).
3: Recovered
Input 'Density' represents the
density downstream at a location
Where the pressure has fully
recovered (
3
).
Density Exponent.
This factor is used when density correction
is enabled. The formula 1/
will be used
when the input value is set to 0, else the
input value will be used.
For more details refer to section 'Density
correction'.
-
0
Fluid
The type of fluid being measured
1: Gas
2: Liquid
-
1
Pressure Loss Mode
The method for determining the pressure
loss
1: Absolute value in mbar
The value of input 'Pressure Loss
Value' is taken as a value in mbar
2: Percentage of differential pressure
The value of input 'Pressure Loss
Value' is taken as a percentage
from input 'Differential Pressure'
-
1
Pressure Loss Value
Value in mbar or %, depending on the
'Pressure Loss Mode'.
The pressure loss over the Venturi is used
to calculate the downstream fully
recovered pressure. The pressure loss
equals the difference between the
upstream pressure (p
1
) and the fully
recovered downstream pressure (p
3
)
The standard prescribes that only the
pressure loss that is caused by the venturi
tube should be included (so it should not
include the pressure loss that occurred
between the two pressure tappings before
the venturi tube was installed).
mbar
%
0
Discharge
coefficient
This value will used instead of the
discharge coefficient as specified in the
standard.
Only used when input 'Configuration' is
set to 'User-defined'.
-
0
Summary of Contents for flow-x
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