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  4. GDM-31 Earth Resistivity Monitoring Station

GDM-31 Earth Resistivity Monitoring Station

GDM-31 Earth Resistivity Monitoring Station
Built on the GD resistivity meter, the online monitoring system relies on a self-developed cloud platform, divided into three major modules, integrating multiple technologies, aggregating monitoring data, and realizing hazard early warning, intelligent analysis, and situation assessment.

Product Overview

Functions

The equipment is widely used in engineering scenarios such as reservoir dam seepage monitoring, hydrological and geological disaster prevention, landfill leachate traceability, and rare-earth mining production process dynamic monitoring, providing efficient, accurate, and reliable digital integrated solutions for water conservancy safety operation, geological disaster prevention, and ecological environment comprehensive management.

Measurement Parameters

Maximum transmit power 7200W, current accuracy better than 0.1%, voltage accuracy 0.1%±1μV, pulse waveform square wave, pulse width 0.5~32s, channels 1, iterations 1~255, power frequency interference ≥120dB, voltage measurement range ±24V, data ports USB/RS485, weight 5.1kg, dimensions 473×320×300mm, operating temperature -20℃~60℃, protection IP65; CSM-60 switching unit: maximum channels 60, input impedance 10MΩ, maximum voltage 10V, ADC 12bit, maximum sampling rate 10kHz, weight 3.5kg; TM-20 IoT communication & power module: transmit voltage 0~250V, maximum current 0.5A constant current, input AC120-250V or DC24V, IP65, weight 3.9kg.

Product Gallery

Ordering Information

GDM-31

Application Cases

Mineral Resource Exploration

Mineral Resource Exploration

Engineering Geology Investigation

Engineering Geology Investigation

Hydrogeological Survey

Hydrogeological Survey

Subsurface Environmental Monitoring

Subsurface Environmental Monitoring

Online Monitoring

Online Monitoring

Cross‑hole investigation

Cross‑hole investigation

View more

Key Selling Points

01
Unattended Operation

Supports 24/7 unattended monitoring.

02
3D Dynamic Imaging

Enables monitoring technology with 3D underground space + long-term dynamic continuous imaging.

03
Intelligent Visualization

Supports synchronous acquisition of multiple electrical parameters, realizing intelligent data processing and visualization.

04
Flexible Outdoor Operation

Flexible wiring modes, adaptable to various terrains and monitoring scales, covering large-area sites

05
Intelligent Early Warning

Full-process cloud automation, AI-enabled intelligent inversion and hazard identification, dynamic early warning and traceability.

06
Stable Operation

Long-term stable operation in harsh environments such as extreme cold and no grid power.

07
Multi-source Data Integration

Integrated management of multi-source data, open and customizable, easy to integrate into existing engineering information platforms.

Technical Specifications

ParametersGDM-31
Maximum Transmit Power9000W
Current Accuracybetter than 0.1%
Voltage Accuracy0.1%±1μV
Pulse WaveformSquare Wave
Pulse Width0.5s, 1s, 2s, 4s, 8s, 16s, 32s
ChannelsSingle Channel
Iterations1–255
Power Frequency Interference≥120dB
Voltage Measurement Range±24V
Data PortsUSB, RS485
Weight8.5kg
Dimensions39×20×29cm
Operating Temperature-20℃~60℃
Operating Humidity≤95%

Accessories and Attachments

IoT communication and power integrated module, equipped with 4G/5G communication, can automatically remotely control device startup and shutdown on a schedule, realizing automatic task execution and automatic shutdown after completion, with both power management and remote control functions.
Specifications: IoT communication and power integrated module, built-in 250V boost device

Communication: 4G/5G full-network (annual data 6G)

Protection rating: IP65

Functions: Power management + remote control + data transmission

Ordering Information

Material CodeModelProduct NameCommunication MethodInput VoltageOutput PowerProtection Rating
M0.5008TM-20IoT Communication & Power Integrated Module4G/5G full-networkAC 120~250V or DC 24V250V boostIP65

Centralized electrode switching unit, single unit maximum 60 channels, used for online resistivity meter channel switching management. Multiple units can be cascaded to expand channel count, supporting automatic switching of Wenner, dipole-dipole and other configurations, completing multi-group data acquisition with one electrode deployment.

Specifications: Centralized electrode switching unit, single unit maximum 60 channels

Type: Online single-channel switching box, multiple units can be cascaded to expand channels

Protection rating: IP65

Features: High precision, high sampling rate (10kHz), supports automatic switching of multiple configurations

Ordering Information

Material CodeModelProduct NameMax ChannelsInput ImpedanceADC PrecisionProtection Rating
M1.0005CSM-60Centralized Electrode Switching Unit60 channels10MΩ12bitIP65

Integrated outdoor waterproof cabinet for field open-air deployment, accommodating GDM-31 main unit, TM-20 module, wiring terminals and power modules, providing IP65 protection.

Specifications: Outdoor waterproof cabinet, integrated design

Material: Cold-rolled steel plate spray plastic + silicone sealing strip

Protection rating: IP65

Functions: Accommodate GDM-31 main unit, TM-20 module and wiring terminals

Ordering Information

Material CodeModelProduct NameSpecificationsAppearance MaterialProtection RatingApplicable Scenario
—TM-05Outdoor Waterproof CabinetCustom sizeCold-rolled steel plate spray plasticIP65Field open-air deployment

Used for signal conduction connection between electrodes and switching units, using tinned copper wire core + PE outer skin, with IP68 protection rating, customizable according to survey line length.

Specifications: Multi-core PE cable, tinned copper wire core

Material: Tinned copper wire + PE outer skin

Protection Rating: IP68

Length: Customized according to survey line length (standard 2m/3m/5m spacing)

Ordering Information

Material CodeModelProduct NameSpec LengthProtection RatingWire Core MaterialOuter Skin Material
M1.3007EC-STDElectrode Connection Cable (Standard)Customized by survey lineIP68Tinned copper wirePE

Corrosion-resistant stainless steel electrodes used for electric field signal acquisition in Electrical Resistivity Tomography (ERT). Linearly arranged at equal intervals along key positions such as dam crest, dam shoulder or dam foundation (electrode spacing 2~5 meters), supporting borehole burial and flexible deployment in complex terrain.

Specifications: Corrosion-resistant stainless steel electrode

Material: 304 stainless steel rod/plate

Protection Rating: IP68

Applicable: Resistivity measurement (ERT), dam/slope/tailings pond monitoring

Ordering Information

Material CodeModelProduct NameStructure TypeCore MaterialTensile StrengthOperating Temperature
M4.3002SE-STDStainless Steel Electrode (Standard)Cylindrical/plate304 stainless steel120kg-20℃~60℃

Used for continuous system power supply in field conditions without grid power, monocrystalline silicon solar panel + lithium battery energy storage, supporting GDM-31 main unit and TM-20 module to work around the clock.

Specifications: Monocrystalline silicon solar power supply kit

Material: Tempered glass + aluminum alloy frame + lithium battery

Protection rating: IP65

Power: Supports all-weather continuous power supply for equipment (220V grid power not required)

Ordering Information

Material CodeModelProduct NameRated PowerOutput VoltageEnergy Storage CapacityApplicable Scenario
—SOLAR-STDSolar Power Supply System (Kit)Custom powerDC 24V / AC 220VLithium battery storageField no-grid-power scenarios

Multi-type auxiliary monitoring sensors that fuse with Electrical Resistivity Tomography (ERT) data, including rain gauges, inclinometers, soil moisture meters and GNSS displacement monitoring stations, building an integrated sky-ground-water-project monitoring system.

Specifications: Multi-type auxiliary monitoring sensors, fusing with ERT data

Types: Rain gauge, inclinometer, soil moisture meter, GNSS displacement monitoring

Protection rating: IP65~IP68

Ordering Information

Material CodeModelProduct NameMeasurement ParametersProtection RatingPrecisionApplicable Scenario
—RAIN-STDTipping Bucket Rain GaugeRainfallIP65±0.2mmSlope/Dam Rainfall Monitoring
—TILT-STDInclinometerSlope Angle/SettlementIP65±0.01°Slope Deformation Monitoring
—SOIL-STDSoil Moisture MeterSoil Volumetric Water ContentIP68±3%Dam Seepage/Slope Water Content
—GNSS-STDGNSS Displacement Monitoring Station3D Displacement/SettlementIP65±3mmDam/Slope Surface Displacement