Soil Resistivity Tester
Published: 7/21/2017
Bench-top system for measuring soil resistivity to evaluate structural and mechanical changes in expansive, loess, and cement-stabilized soils. Supports laboratory studies of moisture-induced swelling, collapse, and strength development using resistivity-based indicators.
Product Description
The RX-I Soil Resistivity Tester is designed for laboratory evaluation of typical geotechnical soils including expansive clay, loess, and composite clays such as cement-treated soils. By tracking resistivity changes during wetting-induced swelling, moisture collapse, and cement hydration, the instrument helps establish correlations between macro mechanical properties and resistivity-derived indicators.
A precision constant-current source drives the test while a DC digital voltmeter measures the voltage response across probes to compute resistivity with high accuracy. The fixture uses hard-alloy tungsten carbide probes with controlled spacing, pressure, and low drift to ensure repeatability under defined environmental conditions for rigorous research and quality control.
Technical Specifications
| Parameter | Specification |
|---|---|
| Constant Current Source Output Current | DC 0.01–20 A, continuously adjustable |
| Constant Current Accuracy | better than ±0.05% |
| DC Digital Voltmeter Measuring Range | 0–199.99 mV |
| Sensitivity | 10 μA |
| Basic Error | ±(0.004% of reading ± 0.01% of full scale) |
| Input Impedance | ≥0.3% |
| Resistance Measurement Error | ≤0.3% |
| Probe Spacing | 1.59 ± 0.01 mm |
| Probe Diameter | Φ0.8 mm |
| Probe Material | hard alloy (WC) |
| Probe Pressure | 3 ± 1 N per needle |
| Drift | <0.2% |
| Power Supply | AC 220 V ±10%, 50/60 Hz |
| Power Consumption | 12 W |
| Operating Temperature | 23 ± 2 ℃ |
| Relative Humidity | ≤65% |
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B6-101, Zhongnan High-Tech Intelligent Manufacturing Industrial Park, No. 10 Shuangma Street, Yuetang District, Xiangtan City, Hunan Province, China
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