AquaLab 10 DUO OPERATION (OPTIONAL)
Karl Fischer titration, oven loss on drying, etc.). Moisture content
differences among various methods are usually linear and can be eas-
ily corrected with a linear offset. Therefore, if moisture contents
calculated with the AquaLab DUO instrument are not agreeing with
your reference method, the problem can likely be addressed by ad-
justing a linear offset.
When to Adjust for Linear Offset
Reference methods can differ between labs, so it is a good idea to
check for a linear offset upon receipt of a new isotherm model from
Decagon. In addition, the linear offset should be adjusted if moisture
contents being calculated by the AquaLab DUO instrument are con-
sistently higher or lower for a product than your reference method
values over several samples.
10.5 How to Adjust for Linear Offset or Create a New
Model Based Off an Old Model
1. For the product whose model is to be offset, collect three sub-
samples for analysis.
2. Use two of the subsamples to run duplicate reference method
AquaLab moisture contents and determine the average mois-
ture content.
3. Once you have obtained a reference moisture content, navi-
gate to the Calibration screen in the Configuration menu of
the AquaLab DUO Moisture Analyzer and select %Moisture
from the list of calibration types.
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