10 MOISTURE CONTENT MEASUREMENT AquaLab TDL
10 Moisture Content Measurement
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.
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 Section 3.
The TDL generates water activity values and then uses preloaded
product specific isotherm models to calculate moisture content and
present it on the screen with the water activity.
Obtaining Product Isotherm Models
Since the isotherm relationship for each product is unique, each prod-
uct isotherm model must be determined experimentally. This only
needs to be done once, but must be done prior to testing moisture
content with the TDL.
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