Hanna-instruments HI 83208-2008 Manual de usuario Pagina 33

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INTERFERENCES
Interference may be caused by:
Phosphate above 60 mg/L
Phosphate above 75 mg/L
Sulfide and high concentration of iron
Eliminate color and turbidity interferences by zeroing the meter with the original water sample.
Silica
Silica
Place the cuvette into the holder and close the lid.
Press ZERO key. The display will show “-0.0-” when the
meter is zeroed and ready for measurement.
Remove the cuvette and add the content of one packet
of HI 93705C-0 Amino acid reagent and shake until it is
completely dissolved.
Reinsert the cuvette into the instrument.
Press TIMER and the display will show the countdown
prior to the measurement. Alternatively, wait for exactly 3
minutes and press READ. When the timer ends the meter
will perform the reading. The instrument displays
concentration in mg/L of silica (SiO
2
).
Press the or to access the second level of functions.
Press the Chem Frm functional key to convert the result in mg/L of Silicon (Si).
Press the or to go back to the measurement screen.
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