01/10 347 LB 444 K-40
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values will not be saved.
Rate:
Count rate in cps is read-in or entered.
Concentration:
Enter the concentration value %K20 determined in the lab.
sk2: Calculate
Calibrate mode
Select the calibration mode: on/lin/squ/cub/auto
(see also 6.5 and 7.2.2).
The calibration mode “linear” is used for the K2O measurement.
One-point
N/A
One-point calibration. For one-point calibration we only need one value pair
(count rate and concentration value) and the absorption coefficient. For
common products it can be taken from the table in the Appendix and
entered as coefficient a1.
Linear
Linear curve fit. This mode is used if at least two value pairs are available.
It should also be used when several calibration points are available which
are very close together, so that not the entire measuring range is covered
by samples.
Square
N/A
The square curve fit can be selected if at least 3 calibration points are
available which are distributed fairly evenly over the measuring range or if
the measurement is carried out in %-concentration, °Bx or in another unit
which is not in linear correlation with the concentration.
Cubic
N/A
The curve fit with cubic coefficient should be applied when the same
conditions exist as under square, but at least 4 value pairs are available and
it becomes apparent during operation that values deviate in some parts
when using square.
Auto N/A The program automatically selects the best curve fit.
At least 4 value pairs must be available for this function.
Select the calibration mode and push <enter> to calculate the calibration factors.
Coefficient a1
Linear absorption coefficient (range -10 to +10).
The coefficient is calculated by the program. At least two calibration points have to be
available.
Zero count rate Io
The zero count rate is automatically calculated for calibration. It corresponds to the zero
point of the unit of measure, i.e. the concentration value “0”.
Coefficient a1
The calculated or entered coefficient a1 is displayed. Do not change it manually; this also
applies to coefficients a2 and a3.
Coefficient a2 N/A
Square absorption coefficient. This value is automatically calculated for two- or multi-
point calibration.
Coefficient a3 N/A
Cubic absorption coefficient. This value is automatically calculated for multi-point
calibration.
Square error.
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