Hanna Instruments HI 96719 - Manual (Page 13)

13
• When the beeper sounds briefly and the
LCD displays dashes, the meter is ready.
The blinking “ZERO” indicates that the
instrument needs to be zeroed first.
• Fill a graduated beaker with 50 mL of
sample.
• Add 0.5 mL of HI 93719A-0 Magnesium
indicator solution, then swirl to mix.
• In the same beaker add 0.5 mL of HI
93719B-0 Alkali solution for
Magnesium, then swirl to mix.
• Fill two cuvettes with 10 mL of sample
each.
• Add 1 drop of HI 93719C-0 EDTA solution
to one cuvette, replace the cap and swirl
the solution. This is the blank.
• Add 1 drop of HI 93719D-0 EGTA solution
to the second cuvette, replace the cap
and swirl the solution. This is the sample.
• Place the blank into the cuvette holder
and ensure that the notch on the cap is
positioned securely into the groove.
• 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.