COSON-ST for hands-free cone penetration testing 

This patented Single-Twist (ST) system enables a fully-automatic CPT cycle with the also patented hydraulically driven COSON pushing system. With just one push of the button, the cycle is started in which the CPT string, with at the tip the measuring instrument, is pushed into the soil by the COSON in one continuous movement. This CPT string is built up in an inventive manner fully automatically from a reel with separate, but interconnected, ST-rods. After reaching the final depth, the downward pushing movement will change into an upward pulling movement and the CPT string will be automatically disassembled and rolled onto the reel.