gds pore pressure transducer

Pore Pressure Transducers: Pore Pressure Transducers are used to measure pressure during testing. The axial/lateral strains are . Unscrew the four dome nuts and carefully pull the Chamber cap out. 8 Additional equipment needed. 8 channel data acquisition pad to take readings from the transducers (instead of using RFM's). Overview The GDS Mid-Plane Pore Pressure Probe (M4P) is designed to provide measurement of pore pressure on the surface of the mid-height of the triaxial test specimen. This is Thus, water pressure in the pr essure system was equal to p 1 = p 0 + p. 2. A double-cased structure lets them perform without receiving any adverse effect from lateral pressures and makes them suitable for measurement where underground soil pressures change significantly. controlling software (GDSLAB) for Windows XP and up. This indicates the output of the pore pressure transducer connected to the base pedestal. The axial load is applied with the 50 kN load frame while confining pressure and input/output pore pressures are controlled by the pressure/volume control pumps with 4.0 MPa capacity. if a GDS 2MPa pore pressure transducer has a full-scale output of 198mV at 10V excitation, an optimum gain range of +-200mV may be set giving a resolution of 200/32767 = 0.0061mV. GDS Helpsheet 48 - Page 1 48 GDS Helpsheet Hardware Triaxial Testing Systems Setting the Datum of Pressure Measurement 1. The power supply and motor control unit which is contained within the main cabinet has the following items: . In addition, there is a fourth transducer measuring pore pressure. The standard GDS 8 channel data acquisition device, known as the "serial data pad", may be used within any of the system combinations. Features: Precise measuring of pore pressure The pore pressure oscillation method. For use with Triaxial Cells or Flexible Wall Permeability Cells. Introduction . [1] Pore Pressure Transducers Product Code : GDSPPT GDS have a large range of transducers for measuring the pore water pressure during a test.Our transducer range for 100kPa to 128MPa (See Technical Specification below). +/-10mV, +/-20mV, +/-30mV (load cells) +/-100mV, +/-200mV (pressure transducers) The GDS 50/70/100mm triaxial cell is provided with an attachment called the "pressure transducer block" which enables a pore pressure transducer to be plumbed directly to the base pedestal of the cell. GDS Instruments (A division of Global Digital Systems Ltd) designs, develops and manufactures materials testing machines and software used for the computer-controlled testing of soils and rocks. This controller may have an RFM which is connected to the pore pressure transducer. Installation GDS RS232 MUX. Transducers; an axial displacement transducer of the potentiometric type, a load cell (the user can choose the load cell range), and a pore pressure transducer. Water volume change of specimens is measured by a GDS SPC. Introduction . The output of the pore pressure transducer feeds directly into the GDS data acquisition system. The Pore Pressure Transducer contains a deairing valve and the digital readout includes a 4.5in (114mm) LCD digital display. 2. Typically used for pore pressure measurement, the transducers can be combined with remote feedback modules to provide additional reading for cell/back or lower chamber pressure. For both CU/CD triaxial systems a de-aired water supply is also required for testing. Two pressure transducers are installed at the input and output to monitor the inner pore pressure during the undrained response. e.g. Naturally there will be small differences between measurements of the same pressure made by these transducers. 1. Pore pressure transducer. This multiplexer allows up to four devices to be connected to a single RS232 communications port on the PC. Overview The GDS Mid-Plane Pore Pressure Probe (M4P) is designed to provide measurement of pore pressure on the surface of the mid-height of the triaxial test specimen. . The essential composition of the instrument is shown in Figure 4, including: pressure chamber, DSC8 channel acquisition device, GDSLab acquisition software system (GDS Instruments Ltd., Hook, UK . May 2013; . It can be used to saturate up to 4 Midplate Pore Pressure transducers (M4P) at the same time. Helpsheet 135: Provides specification for a standard serial cable to connect GDS devices that use 25 -25 and 9-25 cables Click here to download the PDF helpsheet. The transducers plug into the GDS AdvDCS v2 unit using Lemo connectors . The wire stand attached to the display cabinet allows the unit to be elevated for easier reading. Installation of Pore Pressure Transducer . Pore Pressure Transducer - In CU and CD triaxial tests the pressures inside the sample are measured (U - Pore Pressure), this is done using a pressure transducer attached to the base of the triaxial cell. The cell base houses all of the hydraulic connections to the cell, which include: back pressure, pore pressure, cell pressure and cell fill/empty connections. GDS offer pressurised shearboxes which can be used for these tests such as the ADVDCSS (Combined Advanced Dynamic Cyclic Simple Shear). by 1-cylinder microprocessor-controlled GDS ADVDPC screw pump (V stroke =200 mL; P max =64 . About GDS Instruments. cell pressure transducer, (4) pore air pressure transducer, (5) pore water pressure transducer and (6) a Wet-Wet differential pressure transducer to measure the total volume change of the triaxial specimen. to an in-situ increase in pore water pressure. Remove the blank feedthroughs from the Chamber cap and insert the pressure transducers. Direct measurement of pore water pressure requires an un-drained setup, where the sample is held under effective stress rather than by volumetric confinement. . For underground pore pressure measurement Embedded in soil, BPC-A transducers measure underground pore pressures. This technology is used to evaluate the mechanical properties that are key in geotechnical and earthquake engineering design. GDS Mid Plane Pore Pressure Transducer (required units are kPa) Range = 15bar g Full Scale Output = 1.13mV/V/bar Excitation Voltage used at calibration = 5V Excitation Voltage that will be used in Lab = 5V To convert from bar to kPa multiply by 100 mm mV mV mm Sensitivity = = / This block is located adjacent to the upper chamber of the cell and may be . The proportion of FRO counts is C= (9205+307)/32767. 2.4 Serial Pad (Optional) Theory of the mid plane pore pressure probe and practical installation and uses. The unconsolidated - undrained triaxial test is the fastest test, typically completed under 30 minutes. All GDS Systems: Up to 100MPa; Soil/Rock Shear strain is concentrated in the middle third of the test specimen and so it is logical to measure pore pressure in this region of maximum activity. The newly developed pore gas pressure transducer mainly consists of an electrical pressure sensor package and an integrated membrane filter which can prevent water leaching through the membrane . Typical Test menu The test menu is as follows: B CHECK SATURATION RAMPS ISOTROPIC CONSOLIDATION ANISOTROPIC CONSOLIDATION The GDS Automatic Oedometer System (GDSAOS) is the modern replacement for a traditional hanging weight oedometer. i.e. 145 GDS Helpsheet - EL, STD & ADV Controllers o-ring sizes and replacement . It is performed on cohesive soil samples to determine the undrained shear strength of the core sample. and pressure sensors start logging data. Provision is made by means of two valves to allow the pore pressure transducer to be de-aired and for the pipe-work from the pore pressure transducer to the base pedestal to be flushed with water at the start of a test. A computerized control system was used to acquire the data from all of The GDSAOS is a self-contained stepper motor . Shear strain is concentrated in the middle third of the test specimen and so it is logical to measure pore pressure in this region of maximum activity. Now select channel 12. Data acquisition device. It has no saturation or consolidation stage and is a short-term test to determine short-term engineering problems. At zero pressure this was -307 and at 500kPa this was +9205. This 16 bit device has 8 computer controlled gain ranges, specifically designed to suit transducers used in a triaxial test. It only has a shear stage. The GDS 8 Channel Serial Data Acquisition Pad (generally referred to as the Serial Pad) is a datalogger with 8 channels of 16-bit data acquisition. The cable length may be as desired. Unconfined Compression Testing This system can be used to perform unconfined compression in accordance with 2. A pressure increment was applie d inside the pressure system with the high-speed valve closed. Introduction If the datum of pressure measurement for controllers is set at a different time to that of the pore pressure transducer it is possible to have a difference of 9 kPa between the back pressure controller and the pore pressure transducer when measuring the same pressure . They can be supplied with a number either LEMO or 5 Pin Din plugs for ease of interface into GDS' equipment. GDS Helpsheet Hardware 2Hz MINIDYN Setting Pressure Datum 1. The sensitivity of the 500psi pressure transducer is given by the manufacturer as having an FRO of 200.22mV at10.000V.

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