Electrical CPT(U) cones

Electrical CPT(U) cones, compression or subtraction design, is the measuring method for Cone Penetration Testing. Quality load cells and high precision calibration make all electrical cones complying to EN ISO 22476-1 standards.
The electric cone measures the cone resistance (qc) and local sleeve friction (fS), using strain gauged measuring bodies. In addition, (excess) pore water pressure (u) is measured by a piezo element and the inclination (i) by accelerometers. Geomil uses an inclination sensor for x- and y- deviation.
Standard measuring ranges are 100 or 50 MPa for qc and 1 or 0.5 MPa for (fS).
The load cell signals are amplified and transmitted uphole as a voltage signal via cable and converted to a 16 bit digital signal in the GME 500 data acquisition system.
The cones can also be provided with a temperature (T) senor and environmental or seismic adapters.

A typical Geomil electrical CPT system comprises:
• Electrical compression or subtraction cone with 10 cm2 or 15 cm2 cross-sectional area, supplied in portable protection case.
• CPT cable, available in standard lengths of 2, 10, 30 and 50 m or customized length on request.
• Push-/pull clamp 3655 with a proximity switch for triggering the depth recording.
• Depth encoder, providing incremental digital pulses.
• Data acquisition system GME 500 for A/D conversion and data synchronization.
• CPT tubes and cross-over adapter.
• Windows computer for automatic recording of the CPT data.
• Windows based CPTest acquisition and CPTask presentation and interpretation software.