Hanna Instruments HI 83203-2008 User Manual

Page 11

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 3

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