Description
AQUALAB 4 determines vapor equilibrium at the end of a test by comparing
sequential water activity values, looking for a trigger value difference <0.0005 aw.
This value can be adjusted to any value between 0.0003 and 0.0030 aw. Increasing
the trigger value causes a subsequent reduction in instrument accuracy and
precision but results in a shorter test time. This mode is for samples that are slow to
equilibrate, such as vegetable oils, high-fat samples, and high-viscosity samples. In
these types of cases, the loss in performance may be acceptable in order to speed
up the analysis time. Use a high trigger value only after careful consideration of the
impact on test results
MEASUREMENT SPECIFICATIONS
Water Activity
Range 0.030–1.000 aw
Resolution 0.0001 aw
Accuracy ±0.003 (4TE dew point)
±0.015 (4TEV capacitance)
Repeatability 0.001 aw
Temperature
Range 15-50 °C
Resolution 0.01 °C
Accuracy ±0.1 °C
Read Time ~5 min
2 Responses to WATER ACTIVITY METER