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CPT-Logger Digitizer

The CPT-Logger is the heart of the data acquisition system for geotechnical and environmental testing procedures, such as Cone Penetration Testing (CPT). It is to be used in combination with a standard laptop or industrial computer and data acquisition software, such as CPT-Explorer.

The CPT-Logger combines the following functions:

  • It supplies power to the attached electric conesmeasuring heads, adapters, and alike
  • It digitizes the incoming analogue signals
  • It conditions the incoming digital signals from independent components (e.g. the depth synchronisation)
  • It synchronizes all data for processing on attached computer

The CPT-Logger is compatible with all electrical CPT cones (both compression and subtraction type), electrical measuring headsenvironmental modules and a magnetometer. The high-grade waterproof housing makes the unit extremely suitable for working in the field, the compact design assures the use of little space.

It processes simultaneously up to 8 analogue and 4 digital data signals, such as:

● Cone resistance ● Local sleeve friction ● Inclination ● Pore pressure ● Temperature ● Penetration depth ● Date and time ● Fuel fluorescence ● Electrical permittivity ● Electrical conductivity ● Redox potential ● Acidity (pH)

The CPT-Logger is provided with Cone-ID© for automatic recognition of the connected cone, measuring head, and alike. This system only functions with cones and measuring heads provided with Cone-ID© features and CPT-Explorer data acquisition software.

The CPT-Logger is suitable for mechanical and electrical CPT testing in accordance with the relevant national and international standards.

  • Dimensions (L x W x H): 240 x 175 x 70 mm
  • Weight: 1,600 g
  • Ingress protection: IP68
  • Power supply: 12 to 24 Vdc. 110 and 230 Vac is possible with additional adapter
  • Intergrated circuit breaker
  • Analogue signal input: 8 channels
  • Digital signal input: 4 channels
  • A/D conversion: Dual slope
  • Digital resolution: 24 bits
  • Output port: RS232 or USB (select at order)
  • Power supply to cone: ± 15 Vdc (max. 25 mA)
  • Analogue input signal: ± 10 Vdc
  • Sampling rate: 10 ms/channel
  • Operating temperature: 0 to 60ºC
  • Storage temperature: -30 to 85ºC
  • Humidity: 5 to 100%
  • Vibration resistance: < 500 Hz at 1 G
  • Shock resistance: 10 G peak (10 ms duration)
  • Input protection: 70 V (peak to peak)
  • Input impedance: 80 k parallel 10 nF
  • Calibration accuracy: 50 ppm ± 1 count
  • Long-term drift: 20 ppm/1000 hours
  • Temperature drift: 50 ppm/ºC
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