10 DUO OPERATION (OPTIONAL) AquaLab
10 DUO Operation (Optional)
Previously, measuring moisture content and water activity required
different instruments. Now it is possible to determine both moisture
content and water activity with one machine. The 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 un-
derstanding of the relationship between the two parameters. This
relationship, referred to as the moisture sorption isotherm, is com-
plex and unique to each product type. Customers can use the prod-
uct isotherm to calculate moisture content based on a water activity
measurement. This is most easily accomplished using a model that
characterizes the isotherm. For additional information about sorp-
tion isotherms and models, please refer to Chapter 3.
The DUO generates water activity values just as a Series 4TE, but
then it uses preloaded product specific isotherm models to calculate
moisture content and present it on the screen with the water activity.
For information about upgrading your Series 4TE to a Series 4TE
DUO, please contact Decagon Devices.
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