Vapour Sorption Analyser

Create Static and Dynamic Soil Water Characteristic Curves Automatically

The Vapor Sorption Analyzer (VSA) brings click-and-read efficiency to soil water characteristic curves (SWCC). In 24 to 48 hours, the VSA generates curves with up to 200 data points (water potential vs. water content) for both adsorption and desorption.

The VSA works in the dry (-10 to -475 MPa) range. You can create automated soil water characteristic curves and generate all the correlations with clay activity, surface area, and swelling potential.

With the new static feature, you can hold humidity constant and look at the way soil takes up water into its crystal structure (2:1 clays) and monitor water content change over time.


  • Rapid SWCC generation.
  • Fast expansive soil characterization.
Feature Specification
Water Potential Range
-10 to -475 MPa
Accuracy ±1 MPa, or ± 1%
Isotherm Methods Dynamic Dewpoint Isotherm (DDI) & Static (DVS)
External Gas Not needed, if external gas no more than 7PSI.
Computer Interface USB
Mass Resolution ±0.1 mg
Water Reservoir 20ml
Sample Cup Volume 10cc
Sample Weight 500 to 5,000mg
Power 110 V to 220 V AC, 50/60 Hz
Weight 28 lbs
Temperature 15°C to 60 °C (sample chamber temperature; sample temperature is measured separately, and may vary)
Temp Stability ±0.1 °C
Dimensions W 10" x L 15" x H 12" , 25.4cm x 38.1cm x 30.5cm

Non UK/Ireland Customers

Non UK/Ireland Customers, please contact Decagon Devices at:

Environmental Catalogue
Size: 2.5 MB (2,581,813 bytes)

Quotation Request

Email us to request a quotation for the Vapour Sorption Analyser