Berthold LB 444 - Figure 26: Influence of Absorption Coefficients on One-Point Calibration; Figure 27: One-Point Calibration with Additional Calibration Points

Density Meter LB 444 SECTION 6. BASICS OF DENSITY MEASUREMENTS
63
ln I
Densit
y
/Concentration
c
a
b
Figure 26: Influence of absorption coefficients on one-point calibration
Line a: absorption coefficient correct
Line b: absorption coefficient too small
Line c: absorption coefficient too big
The curve always passes through the calibration point.
The curve obtained with one-point calibration passes through the calibration
point. The gradient of the curve is determined by the entered absorption coeffi-
cient and may therefore be somewhat inaccurate.
One-point calibration is also advisable if only calibration points with very minor
density differences can be recorded, for in this case minor errors in the lab or
during sampling will significantly affect the curve.
One-point calibration may later be supplemented and improved by additional
calibration points.
cps
a
b
Calibration points
Densit
y
in
g
/cm
3
cps
a
b
Calibration points
Densit
y
in
g
/cm
3
Figure 27: One-point calibration with additional calibration points
How to proceed for one-point calibration is described in section 0 Calibration.