Complete Moisture Characteristics in 3-5 Days

HYPROP is a modular lab instrument that generates a moisture characteristic curve and determines the unsaturated hydraulic conductivity of soil samples in standard 250 ml soil sampling rings. After setup the system generates the moisture characteristic while running unattended.

Highly Accurate

Two precision mini-tensiometers measure water potential at different levels within the sample while the sample rests on a precision laboratory scale (2000 gram range; 0.01 gram resolution). As the sample dries, changes in water potential are correlated to changes in moisture content using the Wind/Schindler evaporation method.

Verified Results

Results are verified and values for dry range and saturation are calculated according to a selected model (i.e., van Genuchten/Mualem, Bimodal van Genuchten/Mualem, or Brooks and Corey.) Model parameters can be selected before, during, or after the measurement procedure.


  • Easy and flexible handling
  • Usage of intact standard sampling rings without perforation
  • Tensiometer shafts are installed into the sample from the bottom side
  • Low expenditure of time and costs
  • Suitable for mobile applications
  • High-quality results for the water retention curve especially in the range close to saturation
  • The hydraulic functions are consistently proved by numerous readings
  • T5x Tensiometers may measure beyond 250 kPa due to boiling retardation
  • The mathematical functions are profoundly adapted
  • Simultaneous measurement of water retention curve and hydraulic conductivity
  • Suitable for all soils (provided Tensiometers can be installed)
  • No special requirements for the ambient conditions. Only the evaporation conditions should remain more or less constant during a measurement
  • An existing scale with serial port can be connected to the system
  • Extendable to up to 20 assemblies for one scale


  • The measuring range is limited to the measuring range of the Tensiometers
  • Poor resolution of the hydraulic conductivity near saturation (particularly in sandy soils)

Click here to view the range of accessories avilable for the HYPROP.

Measurement Range for Each Tensiometer
+20 hPa to -1200 hPa / -2500 hPa
0.01 hPa
1.5 hPa (0 hPa to 800 hPa)
RS485 tensioLINK
HYPROP Balance
Measurement Range
0 to 2.5 kg
0.01 g
0.1 g

Non UK/Ireland Customers

Non UK/Ireland Customers, please contact Decagon Devices at: www.decagon.com

HYPROP Balance

HYPROP Balance

The balance is directly connected to the PC via an USB plug. This offers you the possibillity to run multiple balances and HYPROP-devices simultaniously. You profit from an outstanding gain of time if you need to analyze a multitude of soil samples. The great advantage of the balance is its unique long-time stable "tuning-fork-principle".  This pinciple is excellent for the evaporationmeasurements of HYPROP.

The HYPROP-measuring head is directly connected to the scale and offers a clearly defined attribution of balance and measuring head. The HYPROP-FIT software detects the balance and the measuring head autmatically and assigns weighing values to the tension. To reduce weighing errors due to the cable, the new balance cable is much thinner and more flexible

Size: 2.2 MB (2,255,732 bytes)

Quotation Request

Email us to request a quotation for the HYPROP