Hanna Instruments HI 96721C - Manual (Page 14)

14
• Remove the cuvette.
• Add the content of one packet of
HI 93721-0 Iron High Range reagent to
the cuvette. Replace the cap and shake
gently until dissolution is complete.
• 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 3 minutes and 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
iron on the LCD.
INTERFERENCES
Alkalinity:
above 2,000 mg/L (as CaCO
3
). May slow down
color development (negative error).
To resolve this, neutralize the sample with diluted
HCl