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2.
General Product Description
2.1. System Overview
The LabSwift-aw system has been specially developed for determining the
fraction of free water in a test sample like food, cosmetics or pharmaceuticals.
This fraction is also known as „water activity" in the foodstuffs industry and
may not be confused with the water content (g water / g substrate). The water
activity of a sample is indicated by the so called a
-value and is within the range
w
of 0 (absolute dryness) and 1 (condensing humidity).
Only this part takes actively part to the exchange with the ambient humidity and
has a big importance regarding the microbiological stability respectively the
biological functions of microorganisms. The water activity is also influencing
considerably the chemical properties of foodstuff.
For the a
-value determination, the equilibrium air humidity over a sample
w
(water-vapour pressure) is measured . This behaves proportional to the a
-
w
value. The fundamental requisite for determining water activity quickly and
with extreme precision is an excellent moisture sensor that reaches an exact,
reproducible measurement over a very wide range (moisture from 0....100%
RH). Further important properties are an exact, reproducible measurement
result and a good chemical robustness. Novasina has been developing special
electrolytic moisture sensors that stand out for such unique properties for more
than 50 years.
The integrated, resistive electrolytic LabSwift-aw sensor is based on the new
chemical substance of the Novasina „Novalyte Technology", which achieves
an outstanding accuracy and reproducibility.
The complete LabSwift-aw system comprises various software options and
can be optimally adapted to the customer and his requirements.
LabSwift-aw
5
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