AquaLab 4TE Series - How to Adjust for Linear Offset or Create a New Model Based Off an Old Model

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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