KROHNE ALTOSONIC V EN User Manual
Page 55
ALTOSONIC V
Operating Manual rev02 E
7.30850.34.00
Page 55 of 106
Type of product
Low limit
ρ
ρ
ρ
ρ
15
[kg/m3]
High limit
ρ
ρ
ρ
ρ
15
[kg/m3]
K
0
K
1
K
2
Crude
610.5
1075.0
613.9723
0
0
Gasoline
653.0
770.0
346.4228
0.4388
0
Trans.area
770.5
787.5
2680.3206
0
-0.00336312
Jet group
788.0
838.5
594.5418
0
0
Fuel oil
839.0
1075.0
186.9696
0.4862
0
Free fill in
500.0
2000.0
0
0
0
Practical rule: The correction per °C is approximately 0.05% - 0.15% depending on conditions and type
of product.
Standard temperature different from 15°C:
The method is based on a reference standard of 15°C. For example if the proces temperature is 65°C.
15
65→
=
tl
tl
C
C
If the required standard temperature is different from 15°C the correction for the difference is
introduced. For example if the standard temperature is 20°C,
15
20
15
65
→
→
=
tl
tl
tl
C
C
C
Note: If the standard temperature is different from 15°C the density limits per product type also
change. The UFP-V calculates the limitations for the installed standard temperature. A density can not
be filled in beyond limitations. The Free Fill product type is for uncommon products, K0, K1 K2 are
adjustable.
5.1.2
Calculation of correction pressure dependency C
pl
The basic mathematical model, used to develop this standard, relates the compressibility factor
exponentially to temperature and the square of the molecular volume. That is:
]
10
0042092
.
0
10
87096
.
0
00021592
.
0
62080
.
1
[
6
2
15
6
2
15
−
−
⋅
⋅
+
⋅
+
⋅
+
−
=
ρ
ρ
process
process
T
T
EXP
F
F
: Compressibility factor, [1/kPa]
T
proces
: Temperature proces [°C]
ρ
15
: Density at 15 °C [kg/m
3
]
The compressibility factor F is used in the normal manner of volume correction to make the correction
for the pressure effect:
4
10
1
1
−
⋅
⋅
−
=
process
pl
P
F
C
C
pl
: Pressure correction factor
F
: Compressibility factor
P
proces
: Pressure proces [bar]
Practical rule: The correction per bar is approximately 0.005% - 0.015% depending on conditions and
product.