Hanna Instruments HI 96718 - Manual (Page 15)

15
VALIDATION PROCEDURE
Alkalinity above 250 mg/L and acidity above 150 mg/L as CaCO
3
require neutralization since the
color could instantly 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 approxi-
mately 2 minutes after adding the 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.
• Turn the meter on by pressing ON/OFF.
• Press ZERO/CFM and the lamp, cuvette
and detector icons will appear on the
display, depending on the measurement
phase.
• Place the CAL CHECK TM Standard
HI 96718-11 Cuvette A into the cuvette
holder and ensure that the notch on the
cap is positioned securely into the groove.
• When the beeper sounds briefly and the
LCD displays dashes, the meter is ready.