Hanna-instruments HI 93710 Manual de usuario descargar pdf (Pagina 37)

Liquid reagent procedure

• Add 3 drops of HI 93701A-T DPD1 indicator, 3 drops of

HI 93701B-T DPD1 buffer and 1 drop of HI 93701-C to another

cuvet. Shake gently before adding 10 mL of unreacted sample.

Replace the cap and shake gently again.

• 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 or

total 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 Chro-

mium.

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

, shake

the sample for approximately 1 minute after adding the reagent.

Alkalinity above 250 mg/L or acidity above 150 mg/L will not

reliably develop the full amount of color or it may rapidly fade. To

resolve this, neutralize the sample with diluted HCl or NaOH.

Total Chlorine

x 3 x 3

x 1

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 51 52

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Hanna-instruments HI 93710 Manual de usuario Pagina 37