KROHNE CORIMASS MFC 85 EN - Manual (Page 14)

14
Enter the raw data (bold) into the table below then for each temperature calculate
ρ
c
and
ρ
s
using the above equations.
Temp. /°C Conc. by Mass /% Density
/g/cm
3
ρ
c
ρ
s
10 5.52 1.040473 1.002565 2.9473856
14.9 1.112023
20 5.52 1.037835 1.0006212 2.8540898
14.9 1.107953
30 5.52 1.034454 0.9977574 2.7906384
14.9 1.103516
Transfer the
ρ
c
and
ρ
s
into the table below and calculate the
ρ
20
, K1 and K2 values for each
using the equations of Case 2:
Density Temp. K
2
K
1
ρ
20
Liquid ρ
1
= 1.002565 10 -0.0000046 -0.0002404 1.000621
ρ
2
= 1.0006212 20
ρ
3
= 0.9977574 30
Solid
ρ
1
= 2.9473856 10 +0.0001492 -0.0078374 2.85409
ρ
2
= 2.8540898 20
ρ
3
= 2.7906384 30
Program these values into the converter. For this example the fit of the concentration
algorithm, over the range 3 to 17%, is accurate to better than
±
0.1
4.4 Entering the data into the converter
Having calculated the necessary parameters they must now be entered into the converter. In
performing the
ρ
20
, K
1
, K
2
calculations it does not matter which density units are used, (g/cm
3
,
kg/m
3
, lb/US Gallon etc), provided all data is then entered in those units.
For an example consider an oil / water emulsion where the oil has densities of 650.0, 648.5,
and 647.3 kg/m
3
at temperatures 10, 20 and 30°C respectively. From this data:
ρ
20
= 648.5 kg/m
3
K
1
= -0.135 kg/m
3
/°C
K
2
= 0.0015 kg/m
3
/°C
2