Hanna Instruments HI 83742 - Manual (Page 12)

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• Proper use of the dropper:
(a) to get good reproducible results, tap the dropper on the table for several times and wipe
the outside of the dropper tip with a cloth.
(b) always keep the dropper bottle in a vertical position while dosing the reagent.
(a) (b)
• Whenever the cuvet is placed into the measurement
cell, it must be dry outside, and completely free of
fingerprints, oil or dirt. Wipe it thoroughly with
HI 731318 (tissue for wiping cuvets, see chapter
ACCESSORIES) or a lint-free cloth prior to insertion.
• Do not let the reacted sample stand too long after
reaction, or accuracy will be lost.
• After the reading it is important to discard immediately
the sample, otherwise the glass might become
permanently stained.
• All the reaction times reported in this manual are
referred to 20°C (68°F). As a general rule of thumb,
they should be doubled at 10°C (50°F) and halved at
30°C (86°F).
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MEASUREMENT MEASUREMENT MEASUREMENT MEASUREMENT MEASUREMENT
• Press “RANGE” to select the parameter code “P2” for
color density - red wine (see page 13).
• After a few seconds the display will show “-0.0-”.
The meter is now zeroed and ready for measurement.
• Remove the cuvet from the instrument.
• Insert the sample (cuvet #2) into the holder and
close the lid.
#2
(Sample)
• Press READ/TIMER and “----” will blink during
measurement.
• The instrument directly displays the color density on
the Liquid Crystal Display.
INTERFERENCES
Suspended matter should be removed by centrifugation or prior filtration. Use an adequate filter
material that does not absorb color.
• Fill an empty cuvet with deionized water and replace
the cap. This is the zero zero zero zero zero.
#1
(Zero)
• Insert the zero cuvet into the holder and close the lid.
• Press ZERO and “----” will blink on the display.