Hanna Instruments HI 96751 - Manual (Page 8)

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VALIDATION PROCEDURE
• Remove the cuvette.
• Add the content of one packet of
HI 93751-0 reagent, replace the cap
and shake gently the cuvette for 1 minute.
• 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. The
beeper is playing a beep at the end of
countdown period.
Alternatively, wait for 5 minutes then just
press READ/ /TIMER.
In both cases, 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
sulfate on the LCD.
Calcium (as CaCO
3
) >20000 mg/L
Chloride (as Cl - ) >40000 mg/L
Magnesium (as MgCO
3
) >10000 mg/L
Silica (as SiO
2
) >500 mg/L
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 96751-11 Cuvette A into the cuvette
holder and ensure that the notch on the
cap is positioned securely into the groove.
INTERFERENCES
Color or suspended matter in large amounts will interfere: suspended matter should be removed
by previous filtration.
Organic matter in large amounts may impede the precipitation of barium sulfate.
• When the beeper sounds briefly and the
LCD displays dashes, the meter is ready.
The blinking “ZERO” asks for instrument
zeroing.