Hanna-instruments HI 93710 Manual do Utilizador descarregar pdf (Página 35)

• Reinsert the cuvet into the instrument.

• Wait for approximately 30 seconds and then press READ. The

display will show “SIP” during measurement.

• The instrument directly displays concentration in mg/L of free

chlorine on the Liquid Crystal Display.

Note: Free and total chlorine have to be measured separately with

fresh unreacted samples following the above procedure if both

values are requested.

INTERFERENCES

Interference may be caused by:

Bromine

Iodine

Fluorine

Ozone

Oxidized manganese and Chromium

In case of water with hardness greater than 500 mg/L CaCO

, shake

the sample for approximately 1 minute after adding the reagent.

In case of water with alkalinity greater than 250 mg/L CaCO

acidity greater than 150 mg/L CaCO

, the color of the sample could

disappear or develop only partially. To resolve this, neutralize the

sample with diluted HCl or NaOH.

Free Chlorine

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Hanna-instruments HI 93710 Manual do Utilizador Página 35