Hanna-instruments HI 83203-2008 Manual do Utilizador descarregar pdf (Página 11)

20 21

Free Chlorine

• Press ZERO key. The meter will show “-0.0-” when the meter is zeroed and ready for measurement.

• Remove the cuvette.

Powder reagents procedure

• Add the content of one packet of HI 93701-0 DPD reagent.

Replace the cap and shake gently for 20 seconds (or 2 minutes for

of seawater analysis).

• Wait for a minute to allow the undissolved reagent to precipitate

and reinsert the cuvette into the instrument.

• Press TIMER and the display will show the countdown prior to the measurement or, alternatively, wait

for 1 minute and press READ. When the timer ends the meter will perform the reading. The instrument

displays the results in mg/L of free chlorine.

Liquid reagents procedure

• To an empty cuvette add 3 drops of HI 93701A-F DPD1

indicator and 3 drops of HI 93701B-F DPD1 buffer. Swirl

gently to mix, and immediately add 10 mL of unreacted

sample. Replace the cap and shake gently again.

x 3x 3

FREE CHLORINEFREE CHLORINE

FREE CHLORINE

SPECIFICATIONS

Range 0.00 to 2.50 mg/L

Resolution 0.01 mg/L

Accuracy ±0.03 mg/L ±3% of reading

Typical EMC ±0.01 mg/L

Deviation

Light Source Tungsten lamp with narrow band interference filter @ 525 nm

Method Adaptation of the

EPA DPD method 330.5.

The reaction between free chlorine and the

DPD reagent causes a pink tint in the sample.

REQUIRED REAGENTS

POWDER:

Code Description Quantity

HI 93701-0 DPD 1 packet

LIQUID:

Code Description Quantity

HI 93701A-F DPD1 Indicator 3 drops

HI 93701B-F DPD1 Buffer 3 drops

REAGENT SETS

HI 93701-F Reagents for 300 tests (liquid)

HI 93701-01 Reagents for 100 tests (powder)

HI 93701-03 Reagents for 300 tests (powder)

For other accessories see page 46.

MEASUREMENT PROCEDURE

• Select the

Free Chlorine

method using the procedure

described in the

Method Selection

section (see page 11).

• Fill the cuvette with 10 mL of unreacted sample (up to

the mark) and replace the cap.

• Place the cuvette into the holder and close the lid.

Free Chlorine

FREE CHLORINE

10 mL

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