AquaLab
7. Veri cation and Calibration
38
produced under a strict quality assurance regime. Please contact
Decagon Devices to order additional standards via sales@decagon.
com or 1-800-755-2751.
Verifi cation Standard
@ 25°C
Water Activity
13.41m LiCl 0.250 ±0.003
8.57m LiCl 0.500 ±0.003
6.0m NaCl 0.760 ±0.003
0.5m KCl 0.984 ±0.003
Distilled Water 1.000 ±0.003
NOTE: If you need to obtain a Material Safety Data Sheet (MSDS)
for any of these standards, a printable version is available on our web-
site at www.decagon.com/msds.
To use a veri cation standard, remove the twist top and pour the
contents into an AquaLab sample cup. Information about the stan-
dard’s value and molality can be found printed on the outside of
the plastic vial. If for some reason you cannot obtain Decagon’s
veri cation standards and need to make a saturated salt solution for
veri cation, refer to Appendix A.
In TEV models, the capacitance sensor can hold a memory of high
water activity samples such as distilled water or the 0.984 a
w
stan-
dard. If you verify calibration with one of these high water activity
standards, you will need to wait an hour to allow the capacitance
sensor to dry before testing samples of lower water activity or the
results may be slightly high.
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