1 5
• Replace the cap to the cuvet, and shake
gently a couple of times.
• Place the cuvet with the reacted sample
into the cuvet 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 2 minutes and just
press
READ/ /TIMER
.
In both cases, the lamp, cuvet 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
(ppm) of fluoride on the LCD.
reacted
sample
INTERFERENCES
Chlorine interferes at all levels: to eliminate Cl
2
interference add to the 10mL ureacted sample,
1 drop of the optional
HI 93703-53
Chlorine Remover, for each 2 mg/L of chlorine.
Negative interferences may be caused by:
Alkalinity (as CaCO
3
) above 5000 mg/L
Aluminium above 0.1 mg/L
Iron, ferric above 10 mg/L
Positive interferences may be caused by:
Chloride above 7000 mg/L
Phosphate, ortho above 16 mg/L
Sodium hexametaphosphate above 1.0 mg/L
Sulfate above 200 mg/L
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