21
PHO
TOMETER MODE
(b) Shaking the cuvette, moving the cuvette up and down. The movement may be gentle or vigorous.
This mixing technique is indicated with “shake gently” or “shake vigorously”, and one of the
following icons:
shake gently
shake vigorously
(c) Swirl the cuvette gently to mix the solution. This mixing technique is indicated with one of the
following icons:
In order to avoid reagent leaking and to obtain more accurate measurements,
close the cuvette first with the supplied High-Density Polyethylene (HDPE)
plastic stopper
and then the black cap.
Whenever the cuvette is placed into the measurement holder, it must be
dry outside and free of fingerprints, oil and dirt. Wipe it thoroughly with
HI731318
microfiber cleaning cloth or a lint-free wipe 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. For best accuracy, respect the
timings described in each specific method.
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 when possible.