105
• Press the Zero key. The display will show “-0.0-” when the meter is zeroed and ready for
measurement.
• Remove the cuvette.
• Add the content of one packet of the optional reagent
HI 93703-52-0 Glycine Powder. Replace the cap and
shake gently until completely dissolved.
• Add the content of one packet of HI 93757-0 Ozone
Reagent. Replace the cap and shake gently for 20 seconds.
• Replace the cuvette into the holder and close the lid.
• Press Timer and the display will show the countdown prior to the measurement or, alternatively,
wait for 2 minutes and press Read. When the timer ends the meter will perform the reading.
• The instrument displays a concentration value refering to chlorine interference. 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.
Ozone
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