CheckPoint Pharma and CheckPoint
e
Operation and Maintenance Manual
SUEZ © 2018 80 of 112 DLM 97200-03 EN Rev. A
9. Press F1.
10. The standard is flushed through the Sensor and measurements on the standard begin.
11. When measurements are complete, the Sensor displays calibration results, including the mean
TOC values for the blank and 500 ppb sucrose standard (measured) and the expected value
(500 ppb plus blank). Press F1 to accept the calibration or F4 to cancel. Use the button to
scroll through the complete calibration results.
If a printer has been installed, the CheckPoint will print the results of each measurement.
SUEZ recommends that the calibration be applied if the TOC of the blank is 60 ppb, the
measured TOC of the 500 ppb standard is between 300-750 ppb, and the RSD of the replicate
measurements of the 500 ppb standard is 3%.
If a high reagent water blank is observed, this may be a result of a contaminated vial sampling kit.
In this case, the kit should be flushed with low TOC water (such as the second reagent water
blank) using the grab mode until low TOC values are observed; then the calibration should be
repeated.
The TOC calibration is somewhat dependent on ambient temperature, and it is recommended
that the calibration be performed at the same ambient temperature at which the Sensor is
normally operated.
12. If you also want to perform a calibration verification, continue with the following steps.
13. Press F4 until the Mode screen displays.
14. Press F2 to select Grab Sample.
15. Insert the reagent water blank into the vial port.
16. Press F1 to begin analysis.
17. After the vial has been analyzed, the results screen is displayed. Record the values of the
average and the RSD
18. Press F4 to continue.
19. Press F2 to select Grab Sample.
20. Insert the 500 ppb sucrose Calibration standard into the vial port.
21. Press F1 to begin analysis.
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