Hanna Instruments HI 96710 - Manual (Page 17)

17
• 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 one minute 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 the
concentration in mg/L of free 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.