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4. Prepare 500 mL of 1000-ppb Na calibration standard as follows:
a. Rinse the other volumetric flask with ultra pure water three times.
b. Use a pipet to add 50 mL of the 100-ppm Na standard to the volumetric flask. Put the pipet in
the flask to add the solution.
c. Add ultra pure water to the 500-mL mark.
d. Shake the volumetric flask to fully mix the solution.
5. Keep the solutions that are not used in a clean plastic bottle. Rinse the bottle with ultra-pure
water and then with a small amount of the calibration standard. Put a label on the bottle that
identifies the solution and the date it was made.
5.3 Show the calibration data
To see the results of the last calibration, push cal and select CALIBRATION DATA.
To see the results of the last ten calibrations, push menu and select VIEW DATA > LOG DATA >
VIEW CALIBRATION LOG.
5.4 Do a calibration verification
Do a calibration verification to identify if the analyzer is still calibrated.
1. Push menu, then select GRAB SAMPLE/VERIFICATION.
2. Select VERIFICATION, then push enter.
3. Follow the instructions on the display.
4. When prompted, add 200 mL of the calibration standard to the overflow vessel. The
recommended standard is 100 ppb.
Note: Do not use a standard solution that is less than 100 ppb because it can quickly become contaminated,
which changes the concentration.
Important: The temperature of the calibration standard must not be more than ± 5 °C (9 °F)
different than the calibration standard that was used to calibrate the analyzer.
5. When the calibration verification is completed, do a calibration immediately if "FAIL" shows. If
"PASS" shows, no action is necessary.
5.5 Do a temperature calibration
Make sure that the temperature reading is accurate as necessary.
1. Remove the sodium electrode from the middle chamber of the measurement cell.
2. Put the sodium electrode in deionized water to keep it wet.
3. Put a calibrated temperature sensor in the middle chamber of the measurement cell.
4. Record the temperature reading.
5. Push cal, then select TEMPERATURE CAL.
The sample temperature shows on the display.
6. Push enter.
7. If the recorded temperature and the temperature on the display are not the same, enter a
temperature offset.
For example, if the recorded temperature is 23 °C and the temperature on the display is 25 °C,
then enter –2 °C.
8. Install the sodium electrode in the middle chamber of the measurement cell.
5.6 Do a flow rate calibration
Make sure that the flow rate reading is accurate as necessary.
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