Decagon Devices AquaLab 4TE Operator's Manual page 49

AquaLab
7. Verifi cation and Calibration
3. Empty the whole vial of solution into a sample cup. We recom-
mend using the 6.0 NaCl (0.76a ). Do not adjust for the off set us-
w
ing distilled water. Ensure the rim and outside of the cup are clean.
Place the sample cup in the AquaLab's sample chamber.
NOTE: Th e same verifi cation standard may be used to verify and
adjust the linear off set.
4. Carefully close the lid and move the lever to the READ position.
Press the Check icon button to begin testing.
NOTE: If you decide at this point not to continue with the linear off set
program, just return the lever to the OPEN position or press the cancel
button and you will be returned to the previous screen.
5. After your AquaLab has fi nished measuring the verifi cation stan-
dard, it will display the following screen:
6. Press the up and down arrows to adjust the water activity reading
to its proper value for the particular verifi cation standard you are
measuring. When the correct value is displayed, press the Save icon
button to store this new value. To cancel and return to the main
menu, press the cancel button and no changes will be made.
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