AquaLab
10. Duo Operation (Optional)
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10. Duo Operation (Optional)
Previously, measuring moisture content and water activity required
di erent instruments. Now it is possible to determine both moisture
content and water activity with one machine. e Series 4TE can be
upgraded to Series 4TE DUO which can display moisture content
simultaneously with water activity.
To calculate moisture content using water activity requires an under-
standing of the relationship between the two parameters. is rela-
tionship, referred to as the moisture sorption isotherm, is complex
and unique to each product type. A product’s isotherm can be used
to calculate moisture content based on a water activity measurement.
is is most easily accomplished using a model that characterizes the
isotherm. For additional information about sorption isotherms and
models, please refer to Chapter 3. e DUO generates water activ-
ity values just as a Series 4TE, but then it uses preloaded product
speci c isotherm models to calculate moisture content and present it
on the screen with the water activity. For information about upgrad-
ing your Series 4TE to a Series 4TE DUO, please contact Decagon
Devices.
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