16
• Only in the case of total chlorine measurement,
add 3 drops of HI 93734C-0 reagent to the
cuvet.
• For both free and total chlorine, add the content
of one packet of HI 93701-0 Free Chlorine
reagent. Replace the cap and shake gently for
20 seconds (or 2 minutes in case of seawater
analysis).
• Replace the cuvet into the holder and ensure
that the notch on the cap is positioned securely
into the groove.
• Hold READ/TIMER for three seconds. The display
will show the countdown prior to measurement.
Alternatively, wait for:
Free Chlorine:
Total Chlorine:
1 minute
2 minutes and 30 seconds
Then press READ/TIMER.
In both cases “SIP” will blink during
measurement.
• The instrument directly displays concentration
in mg/L of free or total chlorine on the Display.
or
INTERFERENCES
Bromine (positive error)
Oxidized Manganese and Chromium (positive error)
Chlorine dioxide (positive error)
Ozone (positive error)
Iodine (positive error)
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.
for Total
Chlorine
only
or
