Hach LXV526.98.1011A Operaciones página 23

1. Push cal, then select START CALIBRATION.
2. Select an option.
Option Description
AUTO CAL Note: This option is only available if the analyzer has the auto calibration option.
MANUAL
Manually starts an auto calibration.
START
Important: Before an auto calibration is done, do the steps in
overflow vessel
MAN OFFSET Starts a 1-point manual calibration. When prompted, add 200 mL of the calibration standard
CAL to the overflow vessel. The recommended standard is 100 ppb or 1000 ppb.
Note: Do not use a standard solution that is less than 100 ppb because it can quickly
become contaminated, which changes the concentration.
MAN OFFSET Starts a 2-point manual calibration. When prompted, add 200 mL of each calibration
+SLOPE CAL standard to the overflow vessel. The recommended standards are 100 ppb and 1000 ppb.
Important: The difference in temperature of the two calibration standards must not be more
than ± 5 °C (± 9 °F). The second calibration standard must have a sodium concentration
that is 5 to 10 times more than the first calibration standard (e.g., 100 ppb and 1000 ppb). A
large difference between the sodium concentration of the calibration standards is necessary
to get an accurate calibration.
Note: Do not use a standard solution that is less than 100 ppb because it can quickly
become contaminated, which changes the concentration.
5.2.1 Prepare calibration standards
To prepare a 100-ppb Na standard and a 1000-ppb Na standard to do a manual calibration, do the
steps that follow. All volumes and quantities used to prepare the calibration standard must be
precise.
Items supplied by the user:
• Volumetric flask (4x), 500 mL, Class A
• NaCl, 1.272 g
• Ultra pure water, 500 mL
• 1–10 mL TenSette pipet and tips
1. Prepare 500 mL of 1-g/L Na calibration standard as follows:
a. Rinse the volumetric flask with ultra pure water three times.
b. Add 1.272 g NaCl to the volumetric flask.
c. Add 100 mL of ultra pure water to the volumetric flask.
d. Shake the volumetric flask until the powder is fully dissolved.
e. Add ultra pure water to the 500-mL mark.
f. Shake the volumetric flask to fully mix the solution.
2. Prepare 500 mL of 100-ppm Na calibration standard as follows:
a. Rinse the other volumetric flask with ultra pure water three times.
b. Use a pipet to add 5 mL of the 1-g/L 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.
3. Prepare 500 mL of 100-ppb Na calibration standard as follows:
a. Rinse the other volumetric flask with ultra pure water three times.
b. Use a pipet to add 5 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.
on page 21.
Adjust the water level of the
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