39
mL of unreacted sample. Replace the cap and shake gently
again.
• Reinsert the cuvet into the instrument.
• Press TIMER and the display will show the countdown prior to the
measurement or, alternatively, wait for 2 minutes and 30 seconds
and press READ DIRECT. In both cases “SIP” will blink during
measurement.
• The instrument directly displays concentration in mg/L of total
chlorine on the Liquid Crystal Display.
Note: free and total chlorine have to be measured separately with
fresh unreacted samples following the related procedure if both
values are requested.
INTERFERENCES
Interference may be caused by: Bromine, Iodine, Ozone, Oxidized
forms of Chromium and Manganese.
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.
In case of water with alkalinity greater than 250 mg/L CaCO
3
or
acidity greater than 150 mg/L CaCO
3
, the color of the sample may
develop only partially, or may rapidly fade. To resolve this, neutralize
the sample with diluted HCl or NaOH.
Total Chlorine
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