18
Figure 14 Slope Calibration
For best results, the concentration of the standard solution should be less than
the maximum concentration for the method (table 2) and greater than the half
of the maximum concentration. For example to calibrate total chlorine, the
chlorine concentration in the standard solution should be between 1.1 and 2.2
ppm.
The corresponding calibration parameters will be updated and saved in the
memory as the working calibration parameter set. Note that this set of
calibration parameters are not the same as the default set. You can use
RSM_DEFAULT button to copy the default calibration parameters to the
working set.
4.8.3. Reagent Blank Calibration
Some methods have a non-zero intercept value in the calibration equation. For
these methods, a proper non-zero intercept value is pre-loaded in SP-900
prior to shipping. The following steps are used to carry out a reagent blank
calibration:
1. Follow the normal steps to carry out a measurement on a deionized water
sample.
2. Press the CONF button to launch the method configuration page.
3. Press the reagent blank calibration button BlKCal.
4. Press OK to save when exiting from the configuration page or press other
keys to cancel.
i. Resume to Default Calibration Parameters
Pressing the RSM_Default button will copy the default calibration intercept
and slope to the working intercept and slope, respectively. If the default
calibration parameters were created prior to shipping, this button action is to
restore the working calibration parameters to the original factory loaded
calibration parameters.
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