BERTHOLD TECHNOLOGIES LB 444 - Correcting the Results: Addition and Multiplication; Additive Constant

04/03 347 LB 444
69
b) Table values of the example given under a) are available as concentration in g/l
ρ
ρ
ρρ
S
L
L
S
=
⋅
+−
S
S = Concentration in g/l / 1000 (for example, at 100 g/l S = 0.1
Example:
Concentration S = 219.6 g/l: S = 0.2196
Density ρ: 1.0980 g/cm
3
Density H
2
O (r
L
): 0.99823 g/cm
3
ρ
S
=
+−
=
0 99823 0 2196
0 99823 0 2196 10980
18294
.*.
...
. g/cm
3
Input liquid density: 0.99823
Input Solid density: 1.8294
8.5 Correcting the Results: Addition and Multiplication
This option should not be regarded as a substitute for careful calibration. It should only
be used for minor corrections. Otherwise we recommend doing a re-calibration.
An additive constant can be entered at Offset, a multiplication factor at Factor (Calibrate
menu, submenu Calculate).
8.5.1 Additive Constant
The value stored under Offset is added to the density value calculated on the basis of the
count rate. This allows a parallel shift of the calibration curve.
Example:
Measuring range 1.1 - 1.3 g/cm
3
It is found that the measuring values are too low by 0.05 g/cm
3
.
Remedy:
Enter “0.05” at Offset.
All measured values will be increased by 0.05 g/cm
3
.
Instead of 1.1 g/cm
3
, 1.15 g/cm
3
is now indicated and instead of 1.3 g/cm
3
, 1.35 g/cm
3
.
If the measured values are too high by 0.05 g/cm
3
, you have to enter “-0.05”.