Hanna-instruments HI 83212 Manual do Utilizador descarregar pdf (Página 11)

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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 50.

MEASUREMENT PROCEDURE

• Select the

Free Chlorine

method using the procedure described

in the

Method Selection

section (see page 12).

• 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

Ammonia LR

• Remove the cuvette.

• Add 4 drops of HI 93700A-0 First Reagent (6 drops for seawater

analysis). Replace the cap and mix the solution.

• Add 4 drops of HI 93700B-0 Second Reagent (10 drops for seawater

analysis). Replace the cap and mix the solution.

• Reinsert the cuvette into the instrument.

• Press TIMER and the display will show the countdown prior to the

measurement or, alternatively, wait for 3 minutes and 30 seconds and

press READ. When the timer ends the meter will perform the reading.

The instrument displays the results in mg/L of ammonia nitrogen

(NH

-N).

• Press the s or t to access the second level of functions.

• Press the Chem Frm functional key to convert the result in mg/L of ammonia (NH

) and ammonium (NH

• Press the s or t to go back to the measurement screen.

INTERFERENCES

Interference may be caused by: acetone, alcohols, aldehydes, glycine, hardness above 1 g/L, iron, organic

chloramines, sulfide, various aliphatic and aromatic amines.

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