- Model HYPROP - Generate Moisture Release Curves

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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.

HYPROP Vacuum Refilling System - demo
The HYPROP base and tensiometers are usually filled using syringes. It requires some practice to achieve good results. In fact, a skilled user can typically extend the range of the HYPROP significantly.

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Complete and a la Carte Options

Can be purchased as a complete set-up or a la carte to integrate with existing equipment. (Lab scale requirements: serial connection and measuring range of 2000 g; computer requirements).

Advantages

  • 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

Limitations

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

Better Results for Novice Users
Using the vacuum to fill the HYPROP gives the user the best HyProp performance without the learning curve.

The optional HYPROP Refilling System takes much of the painstaking precision work out of filling and setting up the HYPROP. It consists of a set of adapters that attach the base and tensiometers to a vacuum pump.

How It Works
On the day before beginning a test, fill the tensiometers and HYPROP base with degassed water, put the system under vacuum, and leave it overnight. In the morning, you're ready to connect everything and start running a moisture characteristic curve on a soil sample.

The Refilling System

  • Saves 20 - 30 minutes set up time per HYPROP
  • Typically increases HYPROP range, especially for novice users
  • Is especially useful in filling multiple HYPROPS

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The new data evaluation software brings a multitude of significant improvements for the evaluation of the data you obtain from HYPROP evaporation experiment campaigns.

The software also allows the input of data from other water potential instruments such as the WP4C for fitting the soil moisture release curves.

Advantages

  • 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

Limitations

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

Sensor Unit:

  • Measurement Range For: Each Tensiometer: +20 hPa to -1200 hPa / -2500 hPa
  • Resolution: 0.01 hPa
  • Accuracy: 1.5 hPa (0 hPa to 800 hPa)
  • Case/Dimensions Without Soil Sample Ring: PA66GFK, h = 60 mm, 80 mm
  • interface: RS485 tensioLINK

Laboratory Scale (Optional) :

  • Measurement Range: 0 to 2.5 kg
  • Resolution: 0.01 g
  • Accuracy: 0.1 g
  • Interface: RS232

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