17
• After a few seconds, the display will
show
“-0.0-”
. The meter is now zeroed
and ready for measurement.
• Remove the cuvette and add one packet
of
HI 93711-0
reagent. Replace the cap
and shake gently for 20 seconds (or
2 minutes in case of seawater analysis).
• Replace the cuvette into the cuvette holder
and ensure that the notch on the cap is
positioned securely into the groove.
• Press and hold
READ/ /TIMER
for
three seconds.
The display will show
the countdown prior to measurement. An
audible “beep” indicates the end of the
countdown period.
• Alternatively, wait for 2 minutes and 30
seconds and just press
READ/ /TIMER.
In both cases, the lamp, cuvette and
detector icons will appear on the display,
depending on the measurement phase.
• The instrument directly displays
concentration in mg/L of total chlorine
on the Liquid Crystal Display.
INTERFERENCES
Interference may be caused by:
Bromine, Iodine, Chlorine Dioxide, Ozone, Oxidized manganese and Chromium.
In case of water with hardness greater than 500 mg/L CaCO
3
, shake the sample for approximately
1 minute after adding the reagent.
In case of water with alkalinity greater than 250 mg/L CaCO
3
or acidity greater than 150 mg/L
CaCO
3
, the color of the sample could disappear or develop only partially. To resolve this,
neutralize the sample with diluted HCl or NaOH.