GE Analytical Instruments ©2016 116 of 270 DLM 68100-09 EN Rev. A
Chapter 5: Calibration and Verification
Perform Maintenance Tasks
Before calibrating the Analyzer, perform any necessary maintenance tasks. Ensure that the oxidizer reagent is
fresh. If the reagent has been stored at room temperature, it is recommended that the oxidizer be less than two
weeks old.
To perform a blank-corrected calibration
1. Install fresh dilution water.
2. Perform a flush of the reagents and dilution water (Maintenance
Flush Reagents Flush All).
3. Rinse down the Analyzer by analyzing low-TOC water until the response of the Analyzer has stabilized.
4. Perform the Blank Measurement to ensure that the blank concentrations in the Analyzer's memory
accurately reflect the status of the reagents and dilution water that will be used in the calibration. See
“
Measuring the Blank” on page 151 for additional information.
The Analyzer is now ready for calibration. Set up the calibration as described in the following section.
To perform a calibration that is not blank-corrected
1. Consider installing fresh dilution water if it is more than a few days old.
2. Perform a flush of the reagents and dilution water (Maintenance
Flush Reagents Flush All).
Rinse down the Analyzer if it has been analyzing samples more concentrated than the first (lowest
concentration) calibration point. Rinse down can be expedited when necessary by repeating a dilution water
flush (see Step 2).
Setting Up NPOC, IC, TC/TOC Calibration
You can set up multiple calibration protocols for each of the Analyzer’s five dilution ranges.
To set up a new calibration
1. Select the Cal/Ver tab.
2. Press the Calibrate button.
3. To create a new calibration, select an existing calibration and press the Modify button. To help simplify
the set-up process, you will see three default calibration protocols to choose from: NPOC, IC, and TC/
TOC (so called because both TC and TOC are calibrated simultaneously). Select the appropriate default
to modify. Certain protocol variables will be enabled or disabled depending on the type of calibration
you are creating.
NOTE:
If “No USB Key Recognized” message appears, select OK and retry before using a different USB key.
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