The GDS permeability system allows the user to independently control the cell, back & base pressure to perform constant head & constant flow tests though an automated system.
GDSLAB software. There are two cells types available, a purpose built 100mm cell that allows for isotropic testing, or a standard triaxial cell, which can be upgraded for anisotropic testing and to run full triaxial tests.
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GDS Instruments,GDS, GDS PERM