27
MULTIPLE SAMPLES READ
• Place the second cuvet with the reacted sample
into the holder and ensure that the mark on the
glass is matched with the mark on the instrument
top.
• Hold READ/TIMER
for 3 seconds. The display
will show the hourglass blinking and the
countdown prior to measurement.
Alternatively wait for:
Free Chlorine Total Chlorine
1 minute or 2 minutes and 30 seconds
and then just press READ/TIMER
.
In both cases blinking dashes will appear during
measurement.
The instrument directly displays the concentration
in mg/L of free or total chlorine.
Note:It is recommended to make a zero before
each measurement.
Note:If the signal to noise ratio is too high, the
zero value will blink.
INTERFERENCES
The colorimetric measurements are affected by the following interfering agents:
• Bromine (positive error).
• Chlorine dioxide (positive error).
• Iodine (positive error).
• Oxidized Manganese and Chromium (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 approximatively
2 minutes after adding the powder reagent.
or
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