Hanna Instruments c 99 Manuel D’Utilisation

64

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

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