2 ABOUT AQUALAB AquaLab
2.2 AquaLab 4 DUO Specifications
Moisture Content Repeatability: 0.02%
Accuracy to Moisture Content Ref.: 0.1% to 0.5%
2.3 AquaLab Model and Options
Series 4: Uses a chilled-mirror dew point sensor, but lacks the tem-
perature control features found in our premium models.
Series 4TE: User-selectable internal temperature control model,
uses thermoelectric (Peltier) components to maintain internal tem-
perature.
Series 4TEV: Uses both a chilled-mirror dew point sensor and a ca-
pacitance sensor for measuring non-volatile and volatile substances,
respectively. Either sensor is easily selected using the instrument
menu system.
Series 4TE DUO: Uses a chilled-mirror dew point sensor and pro-
grammed models obtained from isotherm data to give the user both
water activity and moisture content simultaneously in five minutes
or less.
Series 4TEV DUO: Uses both a chilled-mirror dew point sen-
sor or capacitance sensor as well as programmed models obtained
from isotherm data to give the user both water activity and mois-
ture content simultaneously for samples containing both non-volatile
and volatile substances.
AquaLab and Water Activity
Water activity (a
w
) is a measurement of the energy status of the wa-
ter in a system. The value indicates how tightly water is “bound”,
structurally or chemically, within a substance. Water activity is the
relative humidity of air in equilibrium with a sample in a sealed
chamber. The concept of water activity is of particular importance
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