The Unconfined Multispeed Test System provides compression/extension testing for a number of geotechnical tests that must have accurate control of the rate of displacement during loading.
With accessories, the unit can perform unconfined compression, CBR, and triaxial shear phase testing.
The base unit includes a stepper motor, lead screw, vertical tension rods and crosshead, displacement transducer, electronic controls and network communications. Versions of the unit are available to test loads up to 90 kN (20,000 lbs.).
Displacement rates can be set to any value between 0.00003 and 15 mm per minutes (0.000001 to 0.6 inches per minute).
The base unit can run in stand-alone mode without a computer. It includes built-in data acquisition and display capability. Sensor readings are dis-played in Sl or English units and stored in memory.
Optional software running in Windows® completely automates the test, reducing the data and preparing test results.
Applicable Test Standards
• ASTM D-2166, AASHTO T-208 Unconfined Compression Testing of Soils
• ASTM D-1663 Compressive Strength of Molded Soil-Cement Cylinders
• ASTM D-1883 “Standard Method for CBR
Options
• Choose capacity to fit user needs from 20, 50 and 90 kN models
• Total automation of data collection and reporting of test results
• Prepare tables and plots of report quality within minutes of completing a test
• Generate columns of data for easy reduction using your own spreadsheet software.
Technicial Features for PX6 Touch Screen
• Color TFT touch display supports 16M colors and supports 800x480 pixel screen resolution
• 3 pcs universal analog input sockets (ADC)
• Each analog input with 18 bit precision (1/256000)
• 1 replacement analog input
• Total of 4 analog high-precision measuring capacities
• 2 analog output sockets (DAC)
• PULSE / DIR outputs (PULSE / DIR / ENA) to control the servo and stepper motor drives.
• Digital outputs for general purpose (can pull relays and control different electrical units)
• Digital inputs for general purpose (receives and evaluates input signals like limit contacts from the environment)
• Potentiometer input (reference signal input for calibration and remote control)
• USB communication signal output (communicates with computers)
• Connects to local networks and the Internet with Ethernet 10/100 network connection output (optional)
• Connects to portable devices via Bluetooth wireless connection (optional)
• 500 test results can be stored in internal memory
• Due to the SD (memory) card connection, a large number of test results can be stored in the device memory (40,000 test results).
• In addition, the results can be taken from the device memory and transferred to the computer as an Excel table. (Optional)
• Resistive touch screen allows easy operation of device functions by touching the screen
• Sensor modules are compatible with loadcell (load cell), pressure sensor (4-20 / 0-20 mA), potentiometric distance sensors, strain washers, thermocouples and all kinds of mV output sensors.
• Provides precise calibration with multi-point calibration (up to 10 points)
• Setting and calibration menus are password protected and prevent unauthorized use
• Allows testing with a computer, tablet, smartphone or on the touch screen panel.
• There are many test sample information screens and test methods in the device memory and tests can be performed easily
• Different menu languages can be selected via the device via language support (Turkish, English, French, Spanish and Russian)
• Speed control algorithm is closed loop PID control and all parameters can be adjusted on user side.
• The device can switch between one-touch load and deformation control modes.
• The graphical field that visualizes the test results on the screen has the ability to change the scale automatically and automatically adjusts the optimal scale as the values change
• Firmware updates can be made via USB input. In addition, via the computer allows remote or internet update.
Data Acquisition & PC Software
Software is developed for both ASTM D-2166, AASHTO T-208, ASTM D-1663, ASTM D-1883 Tests.
The Software includes control of machine, acquisition of load and displacement data, saving them and reports. The Software accepts specimen diameter and height as an input parameter. It automatically calculates correction factor coming from the standarts respect to specimen size. The stability value is calculated regarding to this factor. The software continously updates load and displacement until the end of test.
When the test is completed, the sharpest slope of the graph is calculated. The point that this line crosses displacement axis is commented as an offset. This offset is subtracted from the displacement value at peak point and called as flow. Graphical outputs and reports can be saved as a MS Excel worksheet.
