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AQUALAB VSA
6.2 LINEAR OFFSET
After verification and cleaning the instrument, an offset may be necessary.
NOTE: A linear offset does not adjust the calibration for all water activity levels and should only be used if measuring
water activity in a very small range.
1. Navigate to the Configuration tab.
2. Select Calibration.
3. Select Water Activity.
4. Select Start (Figure 30).
Figure 30 Start calibration
To return to the prior tab, select CANCEL.
5. A prompt will appear to insert a fresh standard and seal the chamber (Figure 31).
NOTE: The same verification standard can be used to verify and adjust the linear offset. If using the same
verification standard, do not open the sample chamber between verification and offset.
Figure 31 Calibration instruction dialog
6. Empty the whole vial of water activity standard into a sample cup.
METER recommends using the 6.00 NaCl (0.76 a
w
). Do not adjust for the offset using
steam distilled water.
7. Ensure the rim and outside of the cup are clean.
8. Place the sample cup in the sample chamber.
9. Carefully close the lid and move the lever to the READ position.
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