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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 3
x 3
FREE CHLORINE
FREE CHLORINE
FREE CHLORINE
FREE 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 93701
A
-F
DPD1 Indicator
3 drops
HI 93701
B
-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