Hanna Instruments HI 96104 - Manual (Page 16)

16
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.
• Alternatively, wait for one minute and
just press READ/ /TIMER. In both
cases, the lamp, cuvette and detector
icons will appear on the display, de-
pending on the measurement phase.
• The instrument directly displays
concentration in mg/L of free chlorine on
the Liquid Crystal Display.
TOTAL CHLORINE MEASUREMENT
• Fill the cuvette up to the mark with 10
mL of unreacted sample and replace the
cap.
• Place the cuvette into the holder and en-
sure that the notch on the cap is positioned
securely into the groove.
• Press ZERO/CFM and the lamp, cuvette
and detector icons will appear on the
display, depending on the measurement
phase.