Product Information

Pressure Membrane Extractor

Pressure Membrane Extractor (0 - 15bar) Model 1000 for water retention curves from shrink / swell soils to 15 Bars

A common problem in soils research is determining water retention curves for various soil types. This applies to non soil experiments where the material under study „curls“ as it dries. The model 1000 is a pressure / membrane type extractor. It is designed to contain shrink-swell soils during extraction. A special EDPM rubber “hold down“ diaphragm is inflated, with 1.81kg of force holding the soil in hydraulic contact with the cellulose membrane surface. The cellulose membrane material is a pure cellulose and has a pore size of 2.4 nanometers. The cellulose membrane can withstand over 10,000 kPa bubbling pressure. The standard model 1000 (100261) can test up to 12, 5.5 x 1 cm high samples and operates in the 0 to 1500 kPa (0 to 15 bar) soil suction range. Choose an optional PM cylinder height, to handle undisturbed cores up to 3 inch high.
The Pressure Membrane Extractor includes the following components:
Top and bottom plates, 5/8“ (1.6 cm) high by 11“ (28 cm) inside diameter cylinder and clamping bolts, cylinder seal O-rings, screen drain plate, compressing diaphragm, and eccentric clamping screw assembly. Connecting hoses (2 required), cut celullose membrane discs, PM Hinge, and torque wrench with socket are ordered separately. Soil sample retaining rings and cylinders of various heights are available separately.


  • wide measuring range
  • designed for shrink-swell soils





Technical Specifications

Technical Specifications

Dimensions:45.72 x 45.72 x 35.56 cm
Weight:32.65 kg



Order Numbers + Accessories


Ordering Details:

Art.-Nr.:  142450   Water retention curves from shrink / swell soils – 15 bar




Tel.: +49 (0) 33432 - 89 575
Fax: +49 (0) 33432 - 89 573

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Tel.: +49 (0) 8161 - 23 46 441
Fax: +49 (0) 8161 - 23 46 443