HYPROP
Generate detailed moisture release curves on undisturbed soil samples in a standard 250 mL sample ring, typically within a few days. Range: 0 to -85 kPa. HYPROP also determines unsaturated hydraulic conductivity values for the soil sample.
US: 1.800.755.2751
International: +1.509.332.2756
Measurement: Water Potential
Water Potential Instruments
Water potential describes the force that drives water movement. It is the most fundamental and essential measurement in soil physics. Unfortunately, it's also a tricky thing to measure. The chart on the right (click on it to view the full image)…
T4 Field Tensiometer
Standard field tensiometer. Only the ceramic cup is filled with water to improve accuracy and offer year-round operation. Optionally with external refilling: The model T4e with external refilling can be refilled or emptied without removing it from the soil.
MPS-1 Dielectric water potential sensor
Water potential data with the simplicity of a soil moisture sensor—no maintenance required. Range: -10 to -500 kPa (pF 2 to pF 3.71), moderate accuracy with factory calibration.
T5 Laboratory Tensiometer
Quick-response mini-tensiometer for measuring water potential in small spaces like soil columns, potted plants, and laboratory water flow experiments. Can be used to make spot measurements in the field if care is used.
Vapor Sorption Analyzer
The Vapor Sorption Analyzer (VSA) brings click and read efficiency to soil water characteristic curves. In 24 to 48 hours, the VSA generates 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.
WP4 Dewpoint Potentiameter
Measure water potential of a sample in five to ten minutes with excellent accuracy (±0.1 MPa, 0 to -10 MPa; 1%, -10 to -300 MPa). Range of measurement includes permanent wilting point.
T8 External Refilling Field Tensiometer
Field tensiometer's water level indicator tells you when to refill. Also measures temperature and has an external refilling option.
Tensiometers
These modernized tensiometers, built by German company UMS, are THE most accurate way to measure soil matric potential. Thanks to precision engineering, meticulous construction, and fanatical attention to detail, they have terrific accuracy and a range that (with a skilled operator) can extend beyond -200 kPa.
TS1 Smart Tensiometer
The world's first "smart tensiometer." Designed to be installed in the field and left alone. The TS1 logs water potential data, self-refills using soil moisture, monitors temperature, and self-empties when the temperature nears freezing to avoid damage.
WP4C Dewpoint Potentiameter
Fast, Accurate Water Potential Measurements Use the WP4C to measure water potential in 5 to 10 minutes. Range: -0.1 to -300 MPa* </p> Versatile The WP4C can be used to measure the water…
Soil Moisture Release Curve Construction
Decagon's Soil Moisture Release Curve service uses UMS tensiometers and the HYPROP to produce the points for the moisture characteristic curve in the wet range, and the WP4C to produce the points in the dry range. Your soil moisture characteristic curve service is specific for the soils that you send to Decagon, and are over the range that you specify.