12
• It is important that the sample does not contain any debris. This
would corrupt the reading.
• Each time the cuvette is used, the cap must be tightened to the
same degree.
• Whenever the cuvette 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
or a lint-free cloth prior to
insertion.
• Shaking the cuvette can generate bubbles in the sample, causing higher readings. To obtain
accurate measurements, remove such bubbles by swirling or by gently tapping the cuvette.
• 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 cuvette 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).
• In order to maximize accuracy, prior to a measurement follow the
validation procedure
to
be sure that the instrument is properly calibrated. If necessary, calibrate the instrument.
STARTUP
Prepare the instrument for measurement as follows:
• Unpack the instrument by removing the dust protection sleeve from the instrument cuvette
holder.
• Place the battery in the instrument as described in the “BATTERY REPLACEMENT” chapter.
• Place the instrument on a flat table.
• Do not place the instrument under direct sun light.
(a)
(b)