Hanna Instruments HI 96770 - Manual (Page 8)

14 15
• Press ZERO/CFM and the lamp, cuvette
and detector icons will appear on the
display, depending on the measurement
phase.
• After a few seconds the display will show
“-0.0-” . The meter is now zeroed and
ready for measurement.
• Remove the cuvette.
• Add the content of one packet of
HI 96770A-0 Silica HR reagent A and
shake until complete dissolution.
• Remove the cap and add the content of
one packet of HI 96770B-0 Silica HR
reagent B. Replace the cap and shake
vigorously until complete dissolution
.
• Press and hold READ/ /TIMER for three
seconds. The display will show the
countdown. The beeper indicates the end
of countdown period.
Alternatively, wait for 10 minutes.
Remove the cap.
• Add the content of one packet of
HI 96770C-0 Silica HR reagent C and
shake vigorously until complete
dissolution.
• Replace the cuvette into the cuvette holder
and ensure that the notch on the cap is
positioned securely into the groove.
• Wait for 2 minutes and then press
READ/ /TIMER. The the lamp, cuvette
and detector icons will appear depending
on the measurement phase.
• The instrument directly displays
concentration in mg/L of silica (SiO
2
) on
the LCD.
To convert the reading to mg/L of silicon
(Si) multiply the reading by 0.467. and
ready for measurement. Remove the
cuvette.
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. 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.
INTERFERENCES
Interference may be caused by:
• Iron (Fe 2+ and Fe 3+ )
interferes at high levels.
• Sulfide (S 2- ) interferes at
high levels.
• Phosphates does not
interfere up to 50 mg/L
PO
4
3- .