GE Sievers 500 RL - Page 125

GE Analytical Instruments ©2010 125 of 226 DLM 74001-04 Rev. A
Chapter 6: Calibration and System Protocols
If the label of the Conductivity Standard shows a value of 25 µS/cm HCl, (or your configuration does
not measure for conductivity), press Next to continue.
If the label on the Conductivity Standard shows a different value, press Edit, enter the value, press
Enter, and then press Next to continue.
7. If you have a standard iOS System:
• Open the door to the iOS System and wait 30 seconds for water to drain.
• Insert the Verification Blank into the iOS System and press Next.
• When prompted, remove the Verification Blank from the iOS System, insert the Accuracy/Precision
and Verification Standard, and press Next.
• When prompted, remove the Accuracy/Precision and Verification Standard from the iOS System,
insert the Conductivity Standard, and press Next.
• When prompted, remove the Accuracy/Precision and Verification Standard (500 ppb sucrose) from
the iOS System. Confirm the value of the Conductivity Standard and insert the vial into the iOS
System. If the label shows a value of 25 µS/cm HCl, press Next to continue. If the label shows a
different value, press Edit, enter the value, press Enter, and then press Next.
8. After the last standard has been analyzed, the summary screen is displayed. Part 1 of the summary
screen displays the data for the standards (see Figure 29). Press the Next button.
9. Press the Print button if you want to print the Calibration results.
10. Part 2 of the summary screen calculations summary for the standards (see Figure 30). Acceptance
criteria are as follows:
• TOC Precision: RSD (Relative Standard Deviation) of last three measurements of 500 ppb standard
 3% and standard deviation is > 2 ppb
• Conductivity Precision: RSD of last three compensated conductivity measurements on 25 µS/cm
standard
 2%
• TOC Accuracy: % Difference
7%
• Conductivity Accuracy: % Difference
2%
The standard deviation and relative standard deviation are calculated as follows:
Standard Deviation =
nx
2
x
2
–
nn 1–
--------------------------------------
)rejectionsof # - srepetitionof (#
set a in mentsof MeasureNumber
Result Each
of Sum




n
x