Two-Point Standardization - Hach SP-510 Instrument Manual

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 , the HARD CAL LED will light continuously.
HARD CAL
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
acknowledge HARD CAL failure. Repeat step 2 through step 4.
5. Push , the ZERO CAL LED will light continuously.
ZERO CAL
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
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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key to
HARD CAL
key to
ZERO CAL