Density Meter LB 444 SECTION 2. SYSTEM DESCRIPTION
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Zero Countrate I0
The zero countrate is automatically calculated for calibration. It corresponds to
the zero point of the unit of measure, i.e. the density or concentration value “0”.
The zero countrate is automatically corrected at midnight, compensating for
source decay. Do not change it manually.
Coefficient a1
Linear absorption coefficient. This value is automatically calculated for calibra-
tion or has to be entered for one-point calibration.
Coefficient a2
Square absorption coefficient. This value is automatically calculated for two- or
multi-point calibration.
Coefficient a3
Cubic absorption coefficient. This value is automatically calculated for multi-point
calibration.
Coefficient sq
Square error. For two- or multi-point calibration this value is calculated automati-
cally. It indicates the quality of the calibration curve for the selected calibration
mode. The smaller the numerical value, the better the curve fit (see section 6.2
Calibration Method). This coefficient is not a criterion for selection of the best
calibration mode (see calibration mode auto).
Factor
Option: You can enter a multiplication factor (0 to 10) to correct the measured
values. Each measured value is multiplied by this factor. It allows you to change
the slope of the calibration curve. When performing a new calibration, the factor
is automatically set to "1" (see also section 6.6 Correcting the Results: Addition
and Multiplication).
Offset
Option: Offset (-9999 to +9999) for additive correction of the measured values,
allowing a parallel offset of the curve. The offset entered here is added to each
measured value. When performing a new calibration, the value is automatically
set to "0" (see also section 0 Additive Constant).
Density TC
Use only for temperature compensation via Pt 100 or current input. The tem-
perature compensated lab values are displayed which were entered at rates 1.
to 10. (g/cm³). Scroll with <
+
> and <
-
>.
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