43
Ozone
• Press TIMER and the display will show the countdown prior to
measurement. Alternatively, wait for 2 minutes and press READ
DIRECT. In both cases “SIP” will blink during measurement.
• The instrument directly displays a concentration value refering to
chlorine interference, on the Liquid Crystal Display. Subtract this
value from the reading from the Standard Measurement Procedure:
this will be the concentration in mg/L of ozone in the sample.
INTERFERENCES
Interference may be caused by: Bromine, Chlorine Dioxide, Iodine.
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.
