57
Hardness Ca
• Add 1 drop of HI 93720C-0 EGTA solution to one cuvette (# 1), replace
the cap and invert the cuvette several times to mix. This is the blank.
• Place the blank (# 1) into the holder and close the lid.
• Press the Zero key. The meter will show “-0.0-” when the meter is zeroed and ready for
measurement.
• Remove the blank and insert the second cuvette (# 2)
into the instrument.
• Press Read to start the reading. The instrument displays concentration in mg/L of calcium
hardness, as CaCO
3
.
• Press or to access the second level functions.
• Press the Chem Frm key to convert the result in mg/L of Calcium (Ca
2+
).
# 1
# 2
# 1
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