18
• In order to avoid reagent leaking
and to obtain more accurate
measurements, it is recommended
to close the cuvet first with the
supplied HDPE plastic stopper and
then with the black cap.
• Each time the cuvet is used, the
cap must be tightened to the same
degree.
• 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.
• Shaking the cuvet can generate bubbles in the sample, causing
higher readings. To obtain accurate measurements, remove such
bubbles by swirling or by gently tapping the vial.
• Do not let the reacted sample stand too long after reagent is
added, or accuracy will be lost.
• It is possible to take multiple readings in a row, but it is
recommended to take a new zero reading for each sample and to
use the same cuvet for zeroing and measurement.
• 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).
