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Standard Pressure Volume Controller

Product Code : STDDPC

The GDS Standard Level Pressure/Volume Controller (STDDPC) is a general-purpose water pressure source and volume change gauge. Aimed at medium pressure commercial testing (<=3MPa), undergraduate teaching and research, the standard controller is the mid level controller from GDS.  Available in 200cc only, but with pressure ranges from 100kPa to 4MPa (default is 3MPa). Click here to read our controller comparison.
Further Information:

Discover more pressure and volume controllers equipment for soil testing.

Standard Pressure Volume Controller
specification datasheet (PDF)
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Key features of GDS controllers Benefits to the user
Does not require a supply of compressed air to function: GDS pressure controllers do not rely on lab air supplies.
Controlled with or without a PC: The GDS pressure controllers can be controlled directly from a computer using the USB 2.0 interface and GDSLAB or with the Smart Keypad (optional for ELDPC) the controller can be configured as a completely stand-alone device.
Accurate measurement: Pressure is measured by an integral pressure transducer. Volume change is measured by counting the steps of the incremental motor.
GDS controllers automatically protect themselves from pressure and volume over-ranges: All GDS pressure controllers are self-protecting and can also be programmed to protect any attached equipment.
Controllers are an ideal back-pressure source: Allowing the measurement of change in volume of the test specimen with no requirement for a separate volume change device.
Controllers can be used with different media: The ELDPC, STDDPC and ADVDPC run using water or oil and GDS have an ADVDPC (1000cc) specifically for use with Air.
Accuracy of Pressure Measurement
<0.15% full range, Volume =< 0.25% measured value with +/- 30mm 3 backlash
Accuracy of Volume Measurement

200cm3
Computer Interface

USB
Dimensions

620mm x 100mm x 140mm
Power

100-240V~1.6A MAX, 50-60Hz
Pressure Accuracy

0.15% FRO
Pressure Range (MPa)

1, 2, 3, 4
Resolution of Pressure Measurement

0.1 kPa (1MPa), 1kPa (2MPa-4MPa)
Volume Accuracy

Better than 0.25%
Volume Capacity

200cm3
Weight Approx (kg)

10
Optional: Digital Remote Feedback Module (Digi RFM)

Normally, the feedback to the main control circuit board comes from the internal pressure transducer. However, this input could come from a different source, such as a remote transducer. GDS has  developed this into an elegantly engineered enhancement which is the Remote Feedback Module (RFM). The RFM enables the output of an external transducer to be measured and displayed by the controller. It also enables the piston action to be controlled from the feedback of the external transducer. The internal pressure transducer and the external transducer readings are displayed and transmitted over the computer interface. Benefits of the Digi RFM include:-
    • Precision when regulating from the external transducer, as it can be positioned closer to the experiment.
    • Can increase the accuracy of the application by choosing a transducer closer to the range of the experiment.
    • Can be used with wet wet differential pressure transducer to increase the accuracy and measurement, e.g. for precise control between back pressure and cell pressure for accurate measurement and control of effective stress.

 

Tests supported by the Standard Pressure Volume Controller, pressure and volume controllers equipment for soil testing :-

Constant Head Permeability

The constant head test simply maintains a constant differential in pressure between the top and the base of the specimen (top pressure is always set higher than the base pressure). The flow is then measured on the top controller and the base controller.  Please note: Some apparatus may require additional components or software modules to perform certain tests.

Constant Head Permeability soil test equipment
Constant Pressure Source

All GDS controllers are designed for use as constant pressure sources.  The stepper motor constantly adjusts itself to ensure the desired pressure is maintained, with the additional advantage that volume change is measured to 1 cubic mm* (*except the pneumatic controller which only regulates pressure and has no capability for measuring volume change or flow).

Constant Pressure Source soil test equipment
Constant Rate of Flow Permeability

The constant rate of flow test simply maintains a constant base pressure whilst applying a constant flow through the top of the specimen. A maximum hydraulic gradient can be set which will pause the rate of flow if the pressure differential between the top and the base of the sample gets too large.  Please note: Some apparatus may require additional components or software modules to perform certain tests.

Constant Rate of Flow Permeability soil test equipment
Pore Water Volume Change

Soil testing involves the application of pressure (stress) and the resulting measurement of strain either by measuring displacements or volume change. GDS pressure/volume controllers can apply pressure and measure volume change, or alternatively can apply volume change and measure the resulting pressure. Essential for soil testing.  Please note: Some apparatus may require additional components or software modules to perform certain tests.

Pore Water Volume Change soil test equipment

Standards for the Standard Pressure Volume Controller, pressure and volume controllers equipment for soil testing :-

ASTM D-6528