18
INTERFERENCES
Bromine (positive error)
Oxidized Manganese and Chromium (positive error)
Chlorine dioxide (positive error)
Ozone (positive error)
Iodine (positive error)
Alkalinity above 250 mg/L CaCO
3
or acidity above 150 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
or NaOH.
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.
• Press and hold READ /TIMER for three seconds. The display will show the countdown prior
to measurement. The beeper is playing a beep at the end of countdown period.
• At the end of measurement, the instrument directly displays concentration in mg/L of free chlorine
and the range number on the LCD.
Alternatively, wait for 1 minute and just press READ /TIMER.
In both cases, the lamp, cuvette and detector icons will appear on the display, depending on
the measurement phase.
MEASUREMENT PROCEDURE
3”
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