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Flow-X─ Function Reference
Flow-X General functions - fxISO5167_ISA1932Nozzle
fxISO5167_ISA1932Nozzle
The function calculates the mass flow rate for ISA1932 Nozzle pressure differential flow devices
according to the ISO-5167 standard.
Compliance
ISO-5167 - 1991 Measurement of fluid flow by means of pressure differential devices, 1st edition, 1991
ISO-5167 Amd.1 : 1998(E)
ISO-5167 - 2003 Measurement of fluid flow by means of pressure differential devices inserted in
circular cross-section conduits running full, 2nd edition, 2003
Function inputs
Remark
EU
Range
Default
Name
Optional tag name, tag description and tag
group
Differential
Pressure
Differential pressure over the primary flow
device measured at the up- and
downstream pressure tappings, which
need to be in the positions as specified in
the standard
mbar
0
Pressure
Upstream pressure value of the fluid at
metering conditions
bar(a)
0
Temperature
Down- or upstream temperature of the
fluid at metering conditions
°C
0
Density
Down or upstream density of the fluid at
metering conditions
kg/m3
0
Dynamic Viscosity
Dynamic viscosity of the fluid
Pa.s
0
Isentropic
Exponent
Also referred to as
(kappa). For an ideal
gas this coefficient is equal to the ratio of
the specific heat capacity at constant
pressure to the specific heat at constant
volume. According to the ISO standard this
ratio may be used, when the real value is
unknown.
0
Pipe Diameter
Internal diameter of the pipe at reference
temperature
mm
0
Pipe Expansion
factor
The thermal expansion coefficient of the
pipe material
1/°C
0.0000108
Pipe Reference
temperature
The reference temperature that
corresponds to the 'Pipe diameter' input
value
°C
20
ISA1932 Nozzle
Diameter
ISA1932 Nozzle diameter at reference
temperature
mm
0
ISA1932 Nozzle
Expansion factor
The thermal expansion coefficient of the
ISA1932 Nozzle material
1/°C
0.0000163
ISA1932 Nozzle
Reference
Temperature
The reference temperature that
corresponds to the 'ISA1932 Nozzle
diameter' input value
°C
20
Pressure Location
1: Upstream
Input 'Pressure' represents the
pressure at the upstream pressure
tapping (p
1
).
Since the absolute pressure is
usually measured at the upstream
tapping this is the most common
setting.
2: Downstream
Input 'Pressure' represents the
-
1
Содержание flow-x
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