GE Analytical Instruments ©2009 150 of 236 DLM 90488-01 Rev. A
The same verification procedure is used whether a multi-point or single-point calibration was
performed. Verification occurs at a single concentration, which you can select. Choose a
concentration that is appropriate for your application. Verification can be repeated at multiple
concentrations if it is desirable to verify the entire analytical range of the instrument instead of
verification near the range of interest only.
Follow these steps to perform a calibration verification:
1. If the Analyzer is taking measurements, press the Stop Analysis button.
2. If you have an ICR unit, make sure the lever is in the Bypass position. If you leave the lever
in the Inline position, a warning message will display later.
3. Press the Menu button, select the Maintenance tab, and then press the Calibrate button.
4. Press the Verify button.
5. If you are performing the verification immediately after the calibration, press the Skip
button to avoid flushing the reagent syringes. If there has been at least an eight-hour delay
between performing the calibration and starting the verification, press Flush to perform a
reagent flush now.
Make sure the Analyzer is connected to a water supply and click Yes.
If you have performed a reagent flush in the last 8 hours, click No to skip the flush and
proceed to Step 6.
6. When the flush is complete, click OK to continue. Remove the protective cap from the
standards vials, and avoid touching the septa to protect against introducing foreign
particles.
7. Press the Ver. Standard button, select the concentration of the standard you will be
measuring, and then push Next.
At this point, the prompts on the Analyzer’s display screen will help guide you through the
verification process.
8. Insert the Verification Blank into the IOS System and press Next.
9. When prompted, remove the Verification Blank from the IOS System, insert the TOC
Verification Standard (as sucrose), and press Next.
10. When prompted, remove the TOC Verification Standard (as sucrose) from the IOS System,
insert the IC Verification Standard (as Na
2
CO
3
), and press Next.
11. After the IC Verification Standard (as Na
2
CO
3
) has been analyzed, the Verification summary
screen is displayed. The Analyzer indicates if verification passed or failed based on the
following criteria:
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