Hanna Instruments HI 96724C - Manual (Page 15)

15
• Wait for 2’ and 30’’ and press READ/ .
The lamp, cuvette and detector icons will
appear on the display, depending on the
measurement phase.
• At the end of measurement, the instrument
directly displays concentration in mg/L of
total chlorine on the LCD.
INTERFERENCES
Bromine (positive error)
Chlorine dioxide (positive error)
Ozone (positive error)
Iodine (positive error)
Oxidized Manganese and Chromium (positive error)
VALIDATION PROCEDURE
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.
Use the validation procedure to ensure that the instrument is properly calibrated.
Warning:
Do not validate the instrument with any standard solutions other than the HANNA CAL
CHECK TM Standards, otherwise erroneous results will be obtained. For accurate validation, please
perform test at room temperature: 18 to 25°C (64.5 to 77.0°F)
• Turn the meter on by pressing ON/OFF.
• When the beeper sounds briefly and the
LCD displays dashes, the meter is ready.