Hanna Instruments HI 83266 - Manual (Page 15)

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• Press the Zero key. The meter will show “-0.0-” when the meter is zeroed and ready for measurement.
• Remove the cuvette.
• Add the content of one packet of HI 93701-0 DPD reagent. Replace
the cap and shake gently for 20 seconds.
• 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.
Free Chlorine
INTERFERENCES
Interference may be caused by: Bromine, Chlorine Dioxide, Iodine, Ozone (all these interferences give positive errors).
Alkalinity above 250 mg/L CaCO
3
will not reliably develop the full amount of color or it may rapidly fade.
To resolve this, neutralize the sample with diluted HCl.
In case of water with hardness greater than 500 mg/L CaCO
3
, shake the sample for approximately
2 minutes after adding the powder reagent.
• The instrument displays the results in mg/L of free chlorine.
Total Chlorine
TOTAL CHLORINE
SPECIFICATIONS
Range 0.00 to 5.00 mg/L
Resolution 0.01 mg/L from 0.00 to 2.50 mg/L;
0.10 mg/L above 2.50 mg/L
Accuracy ±0.03 mg/L ±3% of reading at 25 °C
Typical EMC ±0.01 mg/L
Deviation
Light Source
Tungsten lamp with narrow band interference filter @ 525 nm
Method Adaptation of the EPA method 330.5 and Standard Methods for the Examination of
Water and Wastewater, 20 th edition, 4500-Cl G. The reaction between chlorine and the
DPD reagent causes a pink tint in the sample.
REQUIRED REAGENTS
POWDER:
Code
Description Quantity
HI 93711-0 DPD Powder Reagent 1 packet
REAGENT SETS
HI 93711-01 Reagents for 100 tests
HI 93711-03 Reagents for 300 tests
For other accessories see page 46.
MEASUREMENT PROCEDURE
• Select the Total Chlorine method using the procedure described in the
Method Selection section (see page 15).
• 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.
10 mL