12
GENERAL TIPS FOR AN ACCURATE MEASUREMENT
CUVETTE
The cuvette is part of the optical system in all measurements. The light reaches the sample by passing
through the cuvette glass. As a result, the measurement can be affected by the glass imperfections,
dirt, dust, scratches, or fingerprints present on the cuvette surface.
CUVETTE HANDLING
The cuvettes should be free of scratches or cracks. Any cuvette with visible scratches will be discarded.
The cuvettes should be periodically washed with acid. After washing, the cuvettes should be well
rinsed many times with distilled or deionized water. Allow cuvettes to air‑dry and store them for
long periods of time with caps, to avoid dirt entering inside. Always handle the cuvette by touching
only the cap or its top side (over the horizontal line).
Always store the cuvettes in separate boxes or with separators between them to avoid scratches
on the surface.
CUVETTE PREPARATION
Whenever a cuvette is used, it must be clean inside and outside. When it is placed into the instrument,
it must be dry outside, completely free of fingerprints or dirt.
If the cuvette is not indexed, put the cuvette with the factory mark aligned with the sign on the
instrument top.
HI98713
is a highly accurate turbidimeter. To meet the instrument performance and fully benefit of
its properties it is very important that the analyst perform accurate, precise and repeatable readings
using proper measurement techniques. Special care must be taken during sample preparation and
handling.
The instructions listed below should be carefully followed during measurement and calibration to
ensure best accuracy.
