Volume Change Measurement

GCTS Volume Change Device (VCD-400) is designed to measure the volume change during unsaturated triaxial tests performed with a double-walled triaxial cell. It is equipped with a frictionless rolling diaphragm and an internal LVDT guided by ball bearing unit housed inside a stiff, stainless steel housing. The rolling diaphragm and ball bearing guide are essentially frictionless enabling volume change measurements with no pressure differential.

Unlike other such devices available in the market, hysteresis is eliminated from the VCD-400 by using a well-guided, frictionless piston. The software automatically switches the computer-controlled valve as needed and keeps track of the direction of flow and total volume change during the operation. As an option, the automatic directional valve can be replaced with a manual valve that has a digital switch indicator.