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HI 93741

Total Hardness & Iron LR

The HI 93741 meter measures the Iron (Fe) content and the Magne-

sium (Mg), Calcium (Ca) and Total Hardness in water and wastewater.

SPECIFICATIONS

Range Fe 0 to 400 µg/L

Mg Hardness 0.00 to 2.00 mg/L

Ca Hardness 0.00 to 2.70 mg/L

Total Hardness 0.00 to 4.70 mg/L

Resolution Fe 1 µg/L

Hardness 0.01 mg/L

Accuracy Fe ±10 µg/L ±8% of reading

Hardness ±0.11 mg/L ±5% of reading

Typical EMC Fe ±1 µg/L

Deviation Hardness ±0.02 mg/L

Light Source Light Emitting Diode @ 555 nm

Method For Iron, Adaptation of the TPTZ Method. The

reaction between iron and the reagent causes a

blue tint in the sample.

For Hardness, adaptation of the Standard Meth-

ods for the Examination of Water and

Wastewater, 18

edition, Calmagite/colorimet-

ric method. The reaction between hardness and

reagents causes a maroon tint in the sample.

HI 93741HI 93741

HI 93741

Total Hardness & Iron Low RangeTotal Hardness & Iron Low Range

Total Hardness & Iron Low Range

• Nothing is added to the third cuvet.

• Place the ZERO1 sample into the holder

and ensure that the notch on the cap

is positioned securely into the groove.

• Press ZERO; "SIP" will appear during measurement, then the

instrument will display "ZER2".

• Remove the ZERO1 sample and insert

the ZERO2 sample into the instru-

ment.

• Press ZERO again; "SIP" will appear during measurement, then

the instrument will display the level of Magnesium hardness in

ppm CaCO

(together with "n").

• Remove the ZERO2 sample and insert

the third cuvet into the instrument.

• Press READ; "SIP" will appear during measurement, then the

instrument will display the concentration of Calcium in ppm CaCO

(together with "C").

• Press READ again; "SIP" will appear during measurement and

the instrument will display the total hardness concentration in

ppm CaCO

(together with "t").

ZERO

ZERO2

ZERO

3rd CUVET

Hardness

ZERO1