Vapor Sorption Analyzer Soil Water Characteristic Curves

Pioneering new theories and cutting-edge research require an advanced understanding of soil. Yes, you could assemble a series of complex devices on your own to help understand soil behavior. But even with a dedicated graduate student at your disposal, the process will still prove difficult. What you need is an automated instrument that provides sophisticated information.

Simple instrument—advanced scientific breakthroughs

If you want to understand complex soil issues like clay behavior, specific surface area, shrink-swell capacity, or cation exchange capacity, the VAPOR SORPTION ANALYZER (VSA) is your simplest, most accurate option. It automates the entire process of soil water characteristic curve construction in the dry region (-10 to -475 MPa) by accurately measuring simultaneously, at regular intervals, the water potential and the moisture content of a sample. No other instrument gives this much detail about soil in the dry range.

Delve deeper into your dry soil analysis

The VSA enables you to make detailed measurements no other instrument can. This means you can study the soil at a particle level, examining its chemical makeup and how the layers of soil imbibe water as it gets wetter or lose water as it gets drier. For the first time ever, it’s possible to see hysteresis in dry soils because the VSA analyzes both wetting and drying curves. This is critical information because the area between those curves is indicative of water intrusion into clay layers at the molecular level.

The VSA generates both Dynamic Dew Point Isotherm (DDI) and Dynamic Vapor Sorption (DVS) soil water characteristic curves. How? It continuously wets the sample and stops periodically to measure how heavy it is (DDI), or it keeps the sample at a constant humidity, recording how long it takes the sample to come to equilibrium (DVS). In just 24 to 48 hours, the VSA generates curves with up to 200 data points (water potential vs. water content) for both adsorption and desorption.

With so much information at your fingertips, insights are now officially faster and more convenient.