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1/99 SMV 3000 Transmitter User’s Manual xi
Parameters
A’
d
................................................................................................................................... Area of orifice
A’
u
......................................................................................................................................Area of pipe
C .................................................................................. Flow coefficient or orifice discharge coefficient
d
1
......................................................................................................................Inside diameter of pipe
d
2
........................................................................... Orifice plate bore diameter at flowing temperature
d
o
................................................................................................................... Inside diameter of orifice
E
v
................................................................................................................Velocity of approach factor
F
pv
............................................................................................................ Super compressibility factor
g .........................................................................................................................Acceleration of gravity
K
q
........................................................................... Scaling factor for volumetric flow in PV4 algorithm
K
w
.................................................................................. Scaling factor for mass flow in PV4 algorithm
N
c
......................................................................................................................Units conversion factor
P..............................................................................................................................................Pressure
P
a
.......................................................................................Measured static pressure in PV4 algorithm
P
c
..................................................................................................Absolute critical pressure of the gas
P
d
.................................................................................................Static pressure at downstream point
P
dp
........................................................... Measured differential pressure in Pascals in PV4 algorithm
P
f
....................................................................................................... Absolute pressure of flowing gas
P
r
.............................................................................................................................Reduced pressure
P
u
......................................................................................................Static pressure at upstream point
Q
h
.......................................................................................... Volumetric rate of flow in PV4 algorithm
Qs ...................................................................................................................................... Rate of flow
R ...................................................................................................................................... Gas constant
T..........................................................................................................................Absolute temperature
T
a
...............................................................................Measure process temperature in PV4 algorithm
T
c
............................................................................................ Absolute critical temperature of the gas
T
f
..................................................................................................Absolute temperature of flowing gas
T
r
.........................................................................................................................Reduced temperature
T
ref
...............................................................Absolute temperature of reference flow in PV4 algorithm
v ................................................................................................................................... Specific volume
V
d
.................................................................................................... Fluid velocity at downstream point
V
u
.........................................................................................................Fluid velocity at upstream point
W
h
...................................................................................................Mass rate of flow in PV4 algorithm
Y..................................................................................................................................Expansion factor
Z..........................................................................................................................Compressibility factor
γ (gamma)........................................................................................................................... Fluid density
ρ ..............................................................................................................................................................Density
ρ
act
..................................................................................................................Actual density in PV4 algorithm
ρ
des
............................................................................................................... Design density in PV4 algorithm
ρ
r
........................................................................................ Density of fluid under reference conditions