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The CPTU is a static sounding technique that incorporates continuous measurement of pore water pressure during penetration.
The primary objective of CPT/CPTU investigations is to characterize subsurface ground conditions-including soil classification, layer identification, strength estimation, deformation behavior, and permeability of foundation materials. These evaluations rely predominantly on empirical correlations, supplemented in part by theoretical frameworks.
During testing, a conical probe is advanced vertically into the ground at a steady rate using a series of push rods. The system records the tip resistance alongside pore water pressure (qc), and optionally measures the local side friction along a dedicated friction sleeve positioned on the probe.
Beyond tip resistance and sleeve friction, the setup can also accommodate pore pressure logging (CPTU) and seismic data acquisition (SCPT), offering expanded diagnostic capabilities.
For procurement specialists and laboratory supervisors overseeing geotechnical field equipment, the CPT-1 In-situ Test Microcomputer stands out as a highly cost-effective strategic asset. It merges sophisticated functionality with rugged durability and a notably accessible price point. Engineered with the real-world financial constraints of today's geotechnical consultancies in mind, this instrument helps firms reconcile the competing demands of rigorous data quality, tight deadlines, and limited budgets. Offering performance on par with far more expensive imported units, the CPT-1 enables organizations to enhance their in-situ testing portfolio while avoiding excessive upfront investment.
For geotechnical engineers tasked with subsurface characterization, the Cone Penetration Test (CPT) remains the gold standard for continuous soil profiling. The CPT-1 has been purpose-engineered to serve as the command center for all CPT operations, delivering real-time measurements of cone tip resistance and sidewall friction with a level of precision that transforms raw penetration data into actionable geological intelligence. This instrument does not merely record numbers; it paints a continuous picture of subsurface conditions as the probe advances through each soil layer, enabling engineers to identify stratigraphic boundaries, estimate engineering properties, and make informed foundation design decisions with confidence.
The CPT-1 supports both single-bridge and dual-bridge static cone penetration test configurations, accommodating the full spectrum of CPT applications. When operating in single-bridge mode, the instrument focuses on measuring cone tip resistance (qc) - the primary parameter for estimating soil bearing capacity and classifying soil types. The dual-bridge configuration adds sidewall friction (fs) measurement, enabling the calculation of the friction ratio (Rf = fs/qc), a critical parameter for distinguishing between sands, silts, and clays. The instrument's three differential input channels, each with a measurement range of -20mV to +20mV and a system linearity error of ≤ ±0.1%, ensure that every increment of penetration resistance is captured with laboratory-grade accuracy, regardless of whether the probe is advancing through soft clay or dense sand.
Cone Penetration Test CPT for Geotechnical Investigation and Testing Cone Penetration Test with Pore Water Pressure Measurement (CPTU)
Real-time visualization transforms field operations during CPT campaigns. The large 7-inch TFT color display simultaneously presents the current depth, cone tip value (qc), sidewall value (fs), and color-coded recording curves that update continuously as penetration proceeds. Each screen page displays five meters of depth progression, allowing operators to visually interpret soil layer transitions as they occur. The cone tip curve appears in black, while the sidewall friction curve displays in red - a color scheme that enables immediate differentiation between end bearing and sleeve friction components. This instantaneous feedback is invaluable for identifying unexpected soil conditions, adjusting penetration rates, or deciding to terminate the test at a particular depth. The instrument's automatic data storage ensures that every data point is securely recorded as the test progresses, eliminating the risk of data loss due to power interruption or operator error.
Depth control and sampling precision are fundamental to reliable CPT data. The CPT-1 employs a pull-wire photoelectric encoder depth signal sampler that tracks penetration depth with exceptional accuracy. The standard depth sampling interval is 10cm, consistent with international CPT standards, but the instrument offers customization down to 2cm for projects requiring ultra-high-resolution profiles. This flexibility allows engineers to match the sampling density to the specific requirements of each project - whether conducting a rapid reconnaissance survey or a detailed site characterization for critical infrastructure. The depth sampler integrates seamlessly with the penetration equipment, with the Hall effect sensor triggering data acquisition only when the probe is actively advancing, preventing erroneous readings during rod changes or probe retrieval.
Cone Penetration Test CPT for Geotechnical Investigation and Testing Cone Penetration Test with Pore Water Pressure Measurement (CPTU)
Data management and export complete the CPT workflow. The instrument's internal Flash memory stores up to 100,000 meters of single-bridge data or 50,000 meters of dual-bridge data - sufficient capacity for extensive site investigation campaigns without the need for frequent data offloading. When the project requires data transfer, the USB flash drive interface enables one-touch export of complete CPT files, including all measurement data, test parameters, probe identification, and calibration coefficients. The exported text files are compatible with standard spreadsheet applications and the included static testing software, which allows engineers to display multiple chart types, perform data corrections, and generate professional CPT reports. This seamless field-to-office data flow eliminates manual transcription errors and accelerates the reporting process.
| Parameter Category | Technical Specification | CPT-Specific Value |
|---|---|---|
| Core Processor | Microcontroller | STM32F103VET6, 16-bit |
| Program Memory | Flash storage | 512KB |
| Data Processing RAM | Static memory | 32KB |
| Data Storage | Flash memory | 2MB |
| Display | Screen type | 7-inch TFT color LCD |
| Display Area | Active region | 156 × 89 mm² |
| Input Channels | Differential inputs | 3 channels |
| Input Range | Per channel voltage | -20mV to +20mV |
| Linearity Error | System accuracy | ≤ ±0.1% |
| Sampling Time | Acquisition speed | 10ms |
| Depth Interval | Standard (customizable) | 10cm (minimum 2cm) |
| Max Depth per Borehole | Penetration limit | 99.9m |
| Single-Bridge Capacity | Data length | ≈100,000 meters |
| Dual-Bridge Capacity | Data length | ≈50,000 meters |
| Max Borehole Files | Total records | 350 holes |
| Measured Parameters (Single Bridge) | Primary output | Cone tip resistance (qc) |
| Measured Parameters (Dual Bridge) | Primary outputs | Cone tip (qc) + Side friction (fs) |
| Derived Parameter | Calculated | Friction ratio (Rf = fs/qc) |
| Depth Sensor | Type | Pull-wire photoelectric encoder |
| Depth Sampling | Trigger method | Hall effect proximity sensor |
| Data Export | Interface | USB flash drive |
| Supported CPT Types | Test modes | SCPT, DCPT |
| Battery | Rechargeable | 7.4V, 5200mAh lithium |
| Power Consumption | Field operation | ≈2W |
| Operating Temperature | Ambient range | 0ºC to 40ºC |
| Unit Weight | Main instrument | ≈960g |
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