BERTHOLD TECHNOLOGIES LB 444 - Page 61

04/03 347 LB 444
51
For other units of measure (e.g. °Bx, %-concentration, g/l, etc.), the temperature coeffi-
cient has to be converted accordingly. To do this, one first has to calculate the density
change/unit of measure obtained for the measuring range (e.g. %):
21
21
change CCCionConcentrat
changeDensity
CC
−
−
=
∆
∆
=
ρ
ρ
ρ
ρ
C1
= Density at average temperature and minimum concentration in measuring range.
ρ
C2
= Density at average temperature and maximum concentration in measuring range.
Example:
ρ
C1
at 20° C and 20 % HCl = 1.0979 g/cm
3
ρ
C2
at 20° C and 30 % HCl = 1.1493 g/cm
3
%*
00514.0
%30%20
1493.10979.1
3
cm
g
C
=
−
−
=
∆
∆
ρ
The temperature coefficient TC' for the unit % is calculated as follows:
TC
TC
C
'
.
.
.== =
1
0 00059
0 00514
011478
∆ρ
∆
Input value: 1.1478e-01