Toc Calibration; Toc Calibration Setup - Hach Anatel PAT700 User Manual

Bottle Mode

6.5 TOC calibration

6.5.1 TOC calibration setup

Page 90
TOC calibration ensures the accuracy of the TOC values obtained by the analyzer. TOC
values are determined by measuring the change in conductivity of a high-purity water
sample as its organic compounds oxidize to carbon dioxide inside the analysis cell. The
procedure subtracts the average of a series of background TOC measurements from the
average of a series of user-selected standard measurements (in the form of sucrose).
Linear regression is performed on the data, and the correlation coefficient (R
percent slope change (% sc) are calculated and reported.
The recommended correlation coefficient, a user-accepted value (R
The calibration will be accepted if the R
change is within the specified ±15% limit.
Figure 69 TOC calibration setup dialog box
Use default settings and use custom settings radio buttons enable you to select
default settings or custom settings. The default selection is use default settings.
Back icon takes you back to the previous dialog box. All changes made to the TOC
calibration are retained.
Forward icon takes you to the next dialog box.
• If you select default settings, the load bottles dialog box opens. See
page 92.
• If you select custom settings, the custom setup dialog box opens. See
you select custom settings and then touch the back button, the analyzer uses the
default settings.
• All changes made to the TOC calibration are retained.
Cancel icon returns you to the run standards dialog box. All changes made in any of the
dialog boxes are lost.
2
value is 0.990 or greater and the percent slope
2
) and
2
), is 0.990 or greater.
Figure 71,
Figure 70. If