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SECTION 3, continued
3.6 Two-point Standardization
Perform standardization after reagent installation or when an optical system
component has been replaced. The standardization method first treats the sample
to make it hard then treats it to become soft. It is performed as follows:
1. Remove the plug from the top port of the colorimeter. See Figure 16.
2. Push
HARD CAL, the HARD CAL LED will light continuously.
3. Wait until the HARD CAL LED flashes, then add two drops of Magnesium
Standard Solution into the top port of the colorimeter.
4. When the LED stops flashing (is continuously lit), wait for the cycle to
complete. At the end of the cycle, the LED will turn off to indicate a
successful calibration. If the LED starts to flash, push the
HARD CAL key to
acknowledge HARD CAL failure. Repeat step 2 through step 4.
5. Push
ZERO CAL, the ZERO CAL LED will light continuously.
6. Wait until the ZERO CAL LED flashes, then add two drops of EDTA
Solution, 10 g/L, into the top port of the colorimeter.
7. When the LED stops flashing (is continuously lit), wait for the cycle to
complete. At the end of the cycle, the LED will turn off to indicate a
successful calibration. If the LED starts to flash, push the
ZERO CAL key to
acknowledge ZERO CAL failure. Repeat step 1 through step 7.
8. Replace the plug in the top port of the colorimeter.
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