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CALCIUM HARDNESSCALCIUM HARDNESS
CALCIUM HARDNESSCALCIUM HARDNESS
CALCIUM HARDNESS
SPECIFICATIONS
Range 0.00 to 2.70 mg/L
Resolution 0.01 mg/L
Accuracy ±0.11 mg/L ±5% of reading
Typical EMC ±0.01 mg/L
Deviation
Light Source Tungsten lamp with narrow band interference
filter @ 525 nm
Method Adaptation of the Standard Methods for the
Examination of Water and Wastewater, 18
th
edition, Calmagite method. The reaction between
calcium and reagents causes a reddish-violet tint
in the sample.
REQUIRED REAGENTS
Code Description Quantity
HI 93720A-0 Ca & Mg indicator 0.5 mL
HI 93720B-0 Alkali solution 0.5 mL
HI 93720C-0 EGTA solution 1 drop
REAGENT SETS
HI 93720-01 Reagents for 100 tests
HI 93720-03 Reagents for 300 tests
For other accessories see page 141.
MEASUREMENT PROCEDURE
• Select the program number corresponding to Hardness Ca on the
secondary LCD by pressing PROGRAM W and V.
• Rinse a graduated beaker
several times with unreacted
sample, before filling it to
the 50 mL mark with the
sample.
• Add 0.5 mL of HI 93720A Calcium
indicator solution and swirl to mix.
• Add 0.5 mL of
HI 93720B Alkali solu-
tion and swirl to mix.
Use this solution to rinse
2 cuvets before filling
them up to the 10 mL
mark.
Hardness Ca
# 1 # 2
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