9
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 should be
discarded. The cuvettes should be periodically washed with acid. After washing, the cuvettes should
be rinsed well with distilled or deionized water, multiple times. Allow cuvettes to air‑dry and store
them for long periods of time with theire 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
The
HI88713
is a highly accurate bench too turbidity meter. Special care must be taken during
calibration and sample preparation to optimize the instrument performance and to fully benefit from
its features. Is very important for the analyst to use proper measurement techniques for accurate,
precise and repeatable readings. The instructions listed below should be carefully followed during
calibration and measurement to ensure optimum 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 cuvette lid during measurement.
• Always use cuvettes without scratches or cracks because they can cause inaccurate readings.
• Always cap the cuvettes to prevent the sample from spilling
• To prevent contamination of the optical system, do not use to much oil.
• When using multiple cuvettes, they should be indexed and matched, when possible.
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.
