04/03
347
LB
444
68
8.4.1
Calculating the Density of Individual Components
With suspensions one can usually assume that liquid and solid density are constant, ex-
cept when the liquid contains dissolved substances with different concentrations.
With solutions, one can use the suspension formula to allow simple calibration. It is bet-
ter, however, to use multi-point calibration without the suspension formulas (input “Sus-
pension measurement – No”) since with solutions the density of both components is not
constant due to the mixing ratio.
With suspensions the solid density is usually known and water is used as carrier liquid
(select
Water TC
and enter the
Solid density
); with solutions, on the other hand, the
density of the relevant components often has to be calculated from table values.
Enter the density of the carrier liquid or the density of the attendant component (mostly
water) at average temperature (reference temperature) as liquid density.
a) Table values are available as % concentration/density
ρ
ρ
ρ
ρ
S
L
L
C
C
=
− +
,
,
*
1
C’
= Concentration in weight percent / 100 (for example, at 20% C’ = 0.2)
ρ
L
= Density of the attendant component in g/cm
3
(liquid density)
ρ
= Density of mixture in g/cm
3
at average concentration
ρ
S
= Density of the component to be measured (Solid density)
Example:
Product
HCl - H
2
O
Measuring range: Concentration
10 - 30% HCl
Average temperature
20°C
Density
ρ
at 20°C and 20% concentration: 1.0980 g/cm
3
Density H
2
O (r
L
) at 20°C:
0.99823 g/cm
3
ρ
S
=
− +
=
0 2 0 99823
0 99823
10980
1 0 2
18294
. * .
.
.
.
.
Input liquid density: 0.99823
Input Solid density: 1.8294
Summary of Contents for LB 444
Page 1: ...Density Meter LB 444 Id No 32816BA2 Rev No 04 22 04 03 ...
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Page 9: ...04 03 347 LB 444 VII ...
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Page 109: ...04 03 347 LB 444 99 13 4 Mounting Device 90 for Pipe Diameter 21 3 76 1 mm ...
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Page 117: ...04 03 347 LB 444 1 14 Ex Certificates for Evaluation Unit ...
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Page 120: ...04 03 347 LB 444 4 15 Ex Certificate for the Detectors ...
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