7.2 Low Calibration
Some methods have a non-zero intercept value in the calibration equation. For these methods, the appro-
priate non-zero intercept value is shipped pre-loaded in the SP-200. The following steps are used to carry
out a low calibration which changes this non-zero intercept value:
1. Complete a measurement with the desired method.
2. Press
Cal/Sys
(
) as needed to highlight
Low-C
.
3. Press
OK
(
) to launch the calibration screen (Figure 10).
4. Fill a sample vial with deionized (DI) water or with solution with a known concentration and place it
in the sample vial compartment of the SP-200.
*
NOTE
*
For best results, the know concentration should be less than half of the max-
imum concentration of the method. See the
Supported Colorimetric Methods
table
for concentration ranges for each method.
5. Use
«
(
) and
-
(
) to adjust the concentration value to match the known concentration of the
solution or to zero if using deionized (DI) water.
6. Press
Calib
(
) to continue with the entered concentration value. The display updates as shown
in Figure 11.
7. Press
OK
(
) to start the low calibration.
8. The message “Low point calibration succeeded” will appear on the display (Figure 12).
9. Press
to exit.
Figure 10.
Figure 11.
Figure 12.
SP-200 User Manual
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