Hanna Instruments HI 83215-2008 Series - Manual (Page 6)

6
INSTRUMENT DESCRIPTION
FUNCTIONAL DESCRIPTION
The measurement process is carried out in two phases: first the meter is zeroed and then the actual
measurement is performed.
The cuvette has a very important role because it is an optical element and thus requires particular
attention. It is important that both the measurement and the calibration (zeroing) cuvette are optically
identical to provide the same measurement conditions. Most methods use the same cuvette for both, so it
is important that measurements are taken at the same optical point. The instrument and the cuvette cap
have special marks that must be aligned in order to obtain better reproducibility.
The surface of the cuvette must be clean and not scratched. This is to avoid measurement interference due
to unwanted reflection and absorption of light. It is recommended not to touch the cuvette walls with
hands.
Furthermore, in order to maintain the same conditions during the zeroing and the measurement phases,
it is necessary to cap the cuvette to prevent any contamination.