25
•
Remove the cap and add the content of one packet of HI 93701-0 Free
Chlorine Reagent.
•
Replace the cap and shake gently to mix for about 20 seconds. This is the
sample.
•
Place the vial into the holder and push it completely down.
• Press
Timer
and the display will show the countdown prior to the measurement and the message
“
Reaction Time
”. Alternatively, wait for 1 minute and press
Read
. The instrument will perform the
reading.
• The instrument displays concentration in
mg/L of free chlorine
.
INTERFERENCES
Interferences may be caused by:
Bromine (Br
2
)
Iodine (I
2
)
Oxidized forms of Chromium and Manganese
Ozone (O
3
)
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.
Chlorine, Free