19
INTERFERENCES
Interference may be caused by:
Bromine
Iodine
Chlorine Dioxide
Ozone
Oxidized manganese and Chromium.
In case of water with hardness greater than 500 mg/L CaCO
3
, shake the sample for approxi-
mately 1 minute after adding the 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 could disappear or develop only partially. To resolve this,
neutralize the sample with diluted HCl or NaOH.
•
Alternatively, wait for 2 minutes and 30
seconds and just
press
READ/ /TIMER.
In both cases, the lamp, cuvette and
detector icons will appear on the display,
depending on the measurement phase.
• The instrument directly displays the
concentration in mg/L of total chlorine on
the Liquid Crystal Display.