Volume Change Apparatus
Testing accessories and preparation equipment
VCD-400 Volume Change Device


The GCTS VCD-400 Volume Change Device is ideal for measurement of volume change in unsaturated-soil triaxial tests. The unique design helps eliminate hysteresis by using well-guided frictionless piston movement.

 

  • Virtually infinite volume measurement capacity possible due to automatic, computer-controlled, flow directional valve.
  • CATS Software is designed to automatically keep track of total volume change (software sold separately).
  • Frictionless rolling diaphragm enable volume change measurements with virtually no pressure differential.
  • No hysteresis due to smooth guided piston stroke & ball bearing guide.
  • Stiff housing results in zero compliance errors.

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).

SPECIFICATIONS

Resolution: . . . . . . . . . . . . . . .0.01 cc
Stroke volume capacity: . . . . 400 cc
Pressure capacity: . . . . . . . . .2,000 kPa
Excitation: . . . . . . . . . . . . . . . 5 VAC @ 3 kHz
Output: . . . . . . . . . . . . . . . . . .2.6 V/V (approximately)
Automatic 4-way
directional valve control: . . . . 24 VDC

 

OPERATION: . . . . . . . . . . . . . . . VCD-400A — Automatic
. . . . . . . . . . . . . . . . . . . . . . . . VCD-400M — Manual

 

SHIPPING

Weight: . . . . . . . . . . . 22 kg.
Dimensions: . . . . . . . 40 x 30 x 30 cm.