14
GENERAL TIPS FOR AN ACCURATE MEASUREMENT
CUVET
The cuvet is part of the optical system in all measurements. The light reaches the sample by
passing through the cuvet glass. As a result, the measurement can be affected by the glass
imperfections, dirt, dust, scratches, or fingerprints present on the cuvet surface. So, special care
must be taken in preparing and handling the cuvet.
Note: In colorimetric measurements, when it is possible use the same cuvet both for zeroing and
measurement. If this is not possible always match the cuvets.
Also, in turbidimetric measurements, if you are using multiple cuvets, always match the cuvets.
CUVET HANDLING
The cuvets should be free of scratches or cracks. Any cuvet with visible scratches will be
discarded. The cuvets should be periodically washed with acid. After washing, the cuvets should
be well rinsed multiple times with distilled or deionized water. Allow cuvets to air-dry and store
them for long periods of time with caps, to avoid dirt entering inside. Always handle the cuvet
by touching only the cap or its top side (over the horizontal line).
Always store the cuvets in separate boxes or with separators between them to avoid scratches on
the surface.
CUVET PREPARATION
Whenever a cuvet 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 cuvet is not indexed, put the cuvet with the factory mark aligned
with the sign on the instrument top.
HI 93414 is a highly accurate combined meter for some very important drinking water parameters:
turbidity and free & total chlorine. 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.
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