Hanna Instruments HI 96719 - Manual (Page 15)

15
VALIDATION PROCEDURE
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 96719-11 Cuvette A into the cuvette
holder and ensure that the notch on the
cap is positioned securely into the groove.
Now, follow normal measurement procedure. The true value of the sample is the reading
obtained multiplied by a factor of one hundred (the dilution factor).
For your reference, factors to convert readings in mg/L to French degrees (FD), German degrees
(DD) and English degrees (ED) of hardness are as follows:
1 mg/L = 0.1 FD = 0.056 DD = 0.07 ED
INTERFERENCES
Interference may be caused by excessive amounts of heavy metals.
• When the beeper sounds briefly and the
LCD displays dashes, the meter is ready.
The blinking “ZERO” asks for instrument
zeroing.