22
METHOD PROCEDURE
• Remove the cuvette.
• Add the content of one packet of
HI93701-0 Free Chlorine Reagent.
Replace the plastic stopper and the cap.
Shake gently for 20 seconds.
• Insert the cuvette into the holder and
ensure that the notch on the cap is
positioned securely in the groove.
• Press Read. The display will show a 1 minute countdown prior to the measurement.
To skip the timer, press Read twice. When the timer ends, the meter will perform the
reading. The instrument displays the results in mg/L of chlorine (Cl
2
).
INTERFERENCES
Interference may be caused by:
• Bromine, Iodine, Oxidized forms of Chromium and Manganese, Ozone
• Hardness greater than 500 mg/L CaCO
3
, to remove the interference shake the
sample for approximately 2 minutes after adding the powder reagent
• Alkalinity greater than 250 mg/L CaCO
3
or acidity value greater than 150 mg/L
CaCO
3
, the color of the sample may develop only partially or rapidly fade, to remove
the interference neutralize the sample with diluted HCl or NaOH
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