General Tips For An Accurate Measurement - Hanna Instruments HI 847492 Instruction Manual

GENERAL TIPS FOR AN ACCURATE MEASUREMENT

The instructions listed below should be carefully followed to ensure best accuracy.
GENERAL TIPS
• Always cap the cuvets to avoid spillage of the sample into the instrument.
• Always close the lid of the instrument during measurement.
• Keep the lid of the instrument closed when it is not used to prevent dust or dirt entering.
• Put always the instrument on a flat, rugged surface when taking measurements.
CUVET
The cuvet is part of the optical system and measurements can be affected by the glass imperfections,
dirt, dust, scratches, or fingerprints present on the cuvet surface.
CUVET HANDLING
Any cuvet with visible scratches must be discarded.
•
Always store the cuvets in separate boxes or with separators between them to avoid scratches on
•
the surface.
Whenever a cuvet is placed into the instrument, it must be dry outside, free of fingerprints or
•
dirt. Wipe it thoroughly with HI 731318 (cloth for wiping cuvets, see Accessories Section,
page 27) or a lint-free tissue prior to insertion.
CUVET OILING
For low haze readings (<1.0 FTU) the cuvets should be oiled outside with the supplied HI
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93703-58 Silicone Oil. Use only one single drop of oil and then wipe the cuvet thoroughly
with a lint-free cloth.
SAMPLING TECHNIQUE
When you make beer haze measurements it is important to take a representative sample.
• The beer to be tested must be placed in upright position in a constant-temperature bath and
hold for 24 hours at 0°C.
• Pre-chill a cuvet in small ice-water bath containing wetting agent (external contact only).
• Without disturbing any sediment rinse and then fill cuvet with test sample.
• Place the cuvet in the small ice-water and degas beer by stirring. The HI 98501-1 Checktemp
10