21
METHOD PROCEDURE
• Insert the cuvette into the holder and ensure that the
notch on the cap is positioned securely in the groove.
• Press
Read
and the display will show a 1 minute countdown prior to the
measurement. To skip the timer, press
Read
twice. The instrument displays the
results in
mg/L
of
chlorine (Cl
2
)
.
INTERFERENCES
Interference may be caused by:
• Bromine, Chlorine Dioxide, Iodine, Oxidized forms of Chromium and Manganese,
Ozone
• Alkalinity greater than 1000 mg/L CaCO
3
if present as bicarbonate (pH < 8.3),
above 25 mg/L CaCO
3
if present as carbonate (pH > 9.0) or acidity value greater
than 150 mg/L CaCO
3
, the color of the sample may develop only partially or rapidly
fade, to remove the interference neutralize the sample with diluted HCl or NaOH
• Hardness greater than 500 mg/L CaCO
3
, to remove the interference shake the
sample for approximately 2 minutes after adding the powder reagent