Equi-pf avoids all the difficulties associated with the traditional tension table technique while preserving the original tension table principles. By automating the inflow and outflow measurements and tension applied to the sample, Equi-pf:

  • Significantly improves the accuracy and reliability of the measurements and data.
  • Reduces sample disturbance as there is no repeat handling required.
  • Considerably reduces labour hours and improves the efficiency of the operation.

 

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You can buy an Equi-pf Automated Soil Moisture Release Curve Apparatus by emailing us to tell us your location and we will put you in contact with our nearest representative. View our contact details here

Benefits of using Equi-pf to determine the soil moisture release curve:

  • Fully automated – the sample is put in place and no further operator intervention is required.
  • No disturbance of the sample during tests.
  • Programmable tension steps.
  • Soil reaches equilibrium at each tension step.
  • Each tension step has a user settable time limit to reach equilibrium.
  • Weighing errors are eliminated – inflow and outflow water volume is measured directly, to an accuracy of 0.1 ml.
  • Outflow and inflow curves, both cumulative and for the current tension are automatically updated and displayed on a graphical LCD.
  • Each tension step can be manually bypassed.
  • Allows multiple continuous drying and wetting cycles.
  • Data on hysteresis in soils.

In addition to the measurement of the standard soil moisture release characteristic, Equi-pF can also be used to study other soil properties including:

  • The effects of temperature on the moisture characteristics of soil
  • Soil moisture characteristics of swelling soils under over-burden pressures
  • The effect of reference point on moisture release properties
  • Unsaturated hydraulic conductivity and diffusivity of soil near saturation
  • The effect of sample height on moisture release curve properties
  • Soil water storage hysteresis characteristics
  • DNAPL contaminant analysis
  • Analysis of air entrapment effects on moisture release

Oregon State University Validates Equi-pF Performance

Under the supervision of Professor Jeff McDonnell a team of his students at Oregon Sate University (Corvallis, Oregon) have validated the performance of Equi-pF using two methods:

  • Testing a number of grades of Accusand and comparing the Equi-pF results with published data on these Accusands.
  • Testing a number of soil cores taken from the HJ Andrews Experimental Forest and comparing the Equi-pF results with historical data from cores from the same site.

The result of the validation tests proved the suitability of Equi-pF for the generation of Soil Moisture Release Curves and also highlighted some significant extra features provided by the system which make it an even more useful tool for Equi-pF users.

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You can buy an Equi-pf Automated Soil Moisture Release Curve Apparatus by emailing us to tell us your location and we will put you in contact with our nearest representative. 

View our contact details here