Berthold LB 444 - Measurements of Suspensions and Solutions; Measurement

Density Meter LB 444 SECTION 6. BASICS OF DENSITY MEASUREMENTS
71
6.5 Measurements of Suspensions and Solutions
Measurement
Density or concentration measurements of suspensions can be carried out in
these units:
a) Density in g/cm
3
b) Concentration in g/l
c) Concentration in weight-%
d) °Be
Data input, calibration and display are done in the selected unit of measure. For
calculation of the calibration curve, the values entered under b) through d) will
be converted into g/cm
3
.
The conversion is done according to the formula:
Concentration in g/l:
ρ
ρ
ρ=− +
(
*
)*1
1000 1000
S
s
S
L
ρ = Density of suspension in g/cm
3
S = Solids content in g/l
ρ
S
= Solids density in g/cm
3
ρ
L
= Liquid density in g/cm
3
Concentration in %:
ρ
ρ
ρ
ρ
=
+−
L
C
C
L
S
,
,
*
1
C' = concentration in %/100
Concentration in
o
Be
For ρ > 1: For ρ < 1:
ρ=
−
144 3
144 3
,
,n
ρ=
+
144 3
144 3
,
,n
n = °Be
Strictly speaking, the formulae for g/l and concentration in % apply only to suspensions. For solutions or
liquid mixtures, large deviations may occur when the measurement involves larger ranges.
The diagram on the next page shows how to convert units of measure in the
density measuring system: