ELS25 - Universal Testing Machine

Triaxial testing, Uniaxial testing, Unidimensional compression tests,  CBR-tests
upgrading to a Direct Shear Tester

Standards: DIN EN ISO 17892-5 • DIN EN ISO 17892-7 • DIN EN ISO 17892-8 • DIN EN ISO 17892-9 • EN 13286-47 • TP BF-StB Part B 7.1 • ASTM D 2435 / 4546 • BS 1377

This universal and computer-controlled laboratory device is equipped with an electromechanical spindle drive for force and displacement-controlled experiments. It is used in soil mechanics to carry out unconfined compression tests according to DIN EN ISO 17892-7, unidimensional compression tests (consolidation tests) according to DIN EN ISO 17892-5, triaxial tests according to DIN EN ISO 17892-8/-9 and for CBR tests according to DIN EN 13286-47.

When using a single shear box type SSD 2 or SSD 5, shear tests according to DIN EN ISO 17892-10 can be performed. The shear cells are placed in the center of the press table top in the same way as odometer or triaxial cells. The GeoDESC software is logging all measurement data.

In addition to the fully automatic PC control, the load frame can be operated directly by touch display with new, intuitive user guidance. All measurement and set values are shown on the display and any information and error messages that occur are visualized.
The measuring range can be adapted to the respective measuring task or the test using exchangeable load sensors from 1 kN to 25 kN. Additional sensors such as Pressure transducers can be integrated into the control loop using a external analog input. It is possible to integrate these external sensors in the control loop.


  • compact 2-column test device with stable, powder-coated steel housing with fold-out operating unit
  • intuitive operation and easy handling with 4,3” touch screen with separate function keys and haptics
  • high speed multi-core-system with bus coupling, each drive unit (e.g. horizontal and vertical gear) using it's own high resolution closed-loop controller with 1 ms sampling time
  • precision electromechanical drive for closed-loop load-, displacement-, speed- and stiffness-controlled testing
  • precise settlement measurement with digital dial gauge, resolution 10 µm and 1 µm
  • electronic load and stroke limitation to prevent sensor damages
  • manual adjustment of the thrust plate / upper traverse
  • changeable load sensors with automatic detection of the measurement range to adapt different test parameters
  • measurement of a external analog signal (e.g. pore pressure sensor and temperature sensors)
  • Hardware-supported permanent memory (EEPROM) for the calibration values of the connected sensors; a calibration data set is saved for each calibrated sensor
  • serial interface for PC-controlled testing with data logging using a standard-PC with the software GeoDESC
  • OPTIONAL: data transfer via network interface / LAN (RJ45)

available Accessories:

  • several load cells (1 kN, 2 kN, 5 kN, 10 kN, 20 kN, 25 kN)
  • digital dial gauges with measurement ranges from 12,5 mm up to 60 mm, resolution 10 µm and 1 µm
  • external sensors, e.g. pore pressure sensors for triaxial testing
  • accessories for uniaxial testing and unidimesional compression testing (oedometer cells)
  • equipment for triaxial testing (triaxial cells, pressure generator, ...)
maximum load: 
25 kN (compression)
drive system: 
movement range: 
300 mm
settlement measurement: 
max. 60 mm, resolution 1 µm (depending on dial gauge)
test speed: 
0 .. 10 mm/min (in steps of 1 µm/min)
setup speed: 
40 mm/min
sample compartment: 
280 x 600 mm (W x H)
power supply: 
230 V AC, 50/60 Hz
400 x 400 x 1500 mm (W x D x H)
approx. 70 kg