Hach DR1300 FL User Manual page 18

c. Put the vial cover on the sample vial.
d. Push Enter to select READ.
10. Measure the Standard 2 vial as follows:
a. Clean the Standard 2 vial with a no-lint cloth.
b. Install the Standard 2 vial in the vial adapter.
c. Put the vial cover on the sample vial.
d. Push Enter to select READ.
11. Identify if a slope calibration is necessary as follows:
• Total chlorine—If the Standard 1 reading is not within ±2 ppb of
the total chlorine value from the Certificate of Analysis and the
Standard 2 reading is not within ±5 ppb of the total chlorine value
from the Certificate of Analysis, do a slope calibration for total
chlorine.
• Free chlorine—If the Standard 1 reading is not within ±2 ppb of
the free chlorine value from the Certificate of Analysis and the
Standard 2 reading is not within ±5 ppb of the free chlorine value
from the Certificate of Analysis, do a slope calibration for free
chlorine.
• Sulfite—If the Standard 1 reading is not within ±5 ppb of the
sulfite value from the Certificate of Analysis and the Standard
2 reading is not within ±20 ppb of the sulfite value from the
Certificate of Analysis, do a slope calibration for sulfite.
8.3 Do a slope calibration
Do a 2-point slope calibration only if the instrument does not pass a
calibration check.
1. Push Enter to set the instrument to on. Keep the sample port cover
closed during startup.
2. After startup, make sure that the sample port is clean. Use a soft
cloth or no-lint paper tissue (or air duster) to clean the sample port
as necessary.
3. Install the vial adapter in the instrument. Push in the tabs on the
sides of the vial adapter.
4. Select CALIBRATION, then select the parameter for the
calibration.
18 English