Hanna Instruments HI 88703 - Manual (Page 10)

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Note: If you are using multiple cuvettes, always match the cuvettes.
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 multiple 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.
GENERAL TIPS FOR AN ACCURATE MEASUREMENT
HI 88703 is a highly accurate meter for turbidity. To meet the instrument’s performance and fully
benefit of its features, it is very important for the analyst to use proper measurement techniques for
accurate, precise and repeatable readings. Special care must be taken during sample preparation and
handling. The instructions listed below should be carefully followed during measuring and calibration
to ensure best accuracy.
GENERAL RULES
• Always put the instrument on a flat, rugged surface when taking measurements.
• Do not operate in direct sunlight.
• Keep the lid of the instrument closed when it is not used to prevent dust or dirt entering inside.
• Always close the lid of the instrument during measurement.
• Always use cuvettes without scratches or cracks because they can cause inaccurate readings.
• Always cap the cuvettes to avoid spillage of the sample into the instrument.
• Do not use too much oil to prevent contamination of the optical system.
• If possible use indexed and matched cuvettes.
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. Special care
must be taken in preparing and handling the cuvette.