Hanna Instruments HI 95715 - Manual (Page 12)

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• It is important that the sample does not contain
any debris. This would corrupt the reading.
• In order to avoid reagent leaking and to obtain
more accurate measurements, it s 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.
• 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).
• 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.