GCTS volume change device 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 GCTS volume change device using well-guided frictionless piston movement. 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. (VCD requires external signal conditioning, sold separately).