Moisture sorption isotherms
AQUALAB VSA
High-resolution moisture sorption, water activity, and WVTR analysis for deeper insight into product stability and packaging performance.
Built for R&D, packaging, and formulation teams
AQUALAB VSA combines fast water activity sensing with precision weighing to generate detailed sorption, desorption, and permeability data, helping R&D, packaging, and QA teams predict shelf life, stability, and moisture-driven failures.
100s
points per isotherm curve
≤48hrs
Typical isotherm creation time
Moisture behavior
in full detail
AQUALAB VSA dynamically measures water activity and weight change to generate high-resolution sorption and desorption isotherms, revealing moisture-driven behavior that traditional DVS methods and static testing cannot capture.
High-resolution isotherms
Create sorption and desorption curves with hundreds of data points instead of five or six, delivering clearer insight into hygroscopicity, caking, clumping, and critical moisture ranges.
Dual testing modes
Generate standard DVS isotherms alongside patented DDI isotherm curves, providing deeper visibility into moisture behavior and enabling more accurate formulation, stability prediction, and material selection.
Faster moisture insight
Dynamic measurement replaces months of manual desiccator testing, producing complete isotherm data in days while maintaining exceptional resolution and repeatability.
Integrated WVTR testing
The optional WVTR testing cell enables accurate water vapor transmission rate analysis without a standalone instrument, supporting packaging evaluation and compatibility with modern sustainable materials.
Predictive moisture modeling
Included Moisture Analysis Toolkit software applies research-tested models to turn raw data into actionable predictions for shelf life, glass transition, and packaging performance.
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Easy to operate
Tactile, glove-friendly buttons and intuitive software simplify test setup and operation, even in lab environments requiring PPE or frequent method changes.
Simple setup and maintenance
Fast test setup, automated data collection, and minimal manual handling reduce training requirements and ongoing maintenance while keeping advanced moisture analysis accessible in-house.
Shop accessories
Water activity standards
Certified salt standards for verifying water activity accuracy and repeatability across instruments, users, and locations. Each box contains 50 tubes.
Desiccant tube assembly
Replacement desiccant tube assembly that maintains stable humidity control and reliable moisture sorption measurements in AQUALAB VSA testing.
Disposable sample cups
Single-use sample cups designed to prevent cross-contamination and ensure consistent, accurate water activity and moisture measurements.
FAQs
Downloads and documents
Cited publications
Technical specifications
Measurement specifications
Mass Resolution
0.5 mg
Water Activity
Range:
0.0300 to 0.9500 aw @ 25 ◦C
Resolution:
0.0001 aw
Accuracy:
±0.0050 aw
External Gas
7.0000 psi max
Isotherm Methods
Dynamic Dew Point Isotherm (DDI) & Static (DVS)
Temperature
Range:
15.00 – 60.00 °C
Resolution:
0.01 °C
Accuracy:
±0.10 °C
Read Time
~5 min (~48 hours for a DDI test)
Communication specifications
Data Communications
USB
Physical specifications
Case Dimensions
Length:
38.1 cm (15.0 in)
Width:
26.7 cm (10.5 in)
Height:
30.5 cm (12.0 in)
Program Identification
Alphanumeric, programmable to display product name, lot, or product ID number.
Sample Cup Volume
10.0000 cc
Sample Weight Range
500.0000 – 5000.0000 mg
Universal Power
110 - 240 VAC50/60 Hz
Water Reservoir
20 mL
Display
64 × 128 graphical
Sample Cup Capacity
14 mL (0.47 fl oz)
Operating Environment
4 to 50 °C; 0 to 90% relative humidity (noncondensing)
Case Material
ABS with Fire Retardant:
POLYLAC PA-765
Weight
14.9 kg (33 lb)
