FR Three-Point Grounding Resistance Monitor
Real-time monitoring of grounding system integrity with three-point high-accuracy resistance measurement for electrical safety compliance
The FR Three-Point Grounding Resistance Monitor provides real-time monitoring of grounding system integrity, measuring grounding resistance at three points with high accuracy. It ensures electrical safety compliance and early detection of grounding system degradation in distribution rooms and critical facilities.
Product Overview
The FR Three-Point Grounding Resistance Monitor monitors grounding resistance values, connection resistance values and other data, accurately recording grounding resistance data with monitoring accuracy up to 0.001 ohm. Uses precision three-wire measurement method, automatically performs multiple tests and takes the average to ensure accurate and reliable measurement results.
The housing uses aluminum alloy material (anti-corrosion design, fearless of wind, rain, lightning), protection class up to IP65, operating temperature -20°C~60°C, suitable for long-term outdoor harsh environment operation. Supports outdoor installation, hoop installation, buried installation, wall-mounted installation, can be used independently or in network.
Core Capabilities
- Monitors grounding resistance values, connection resistance values, accuracy up to 0.001 ohm.
- Aluminum alloy anti-corrosion housing, IP65 protection, fearless of wind, rain, lightning.
- On-site alarm and network remote alarm, real-time notification of abnormal status.
- RS485/Zigbee/Ethernet/4G multiple communication methods, connects to cloud service system.
Product Features
Comprehensive Monitoring, High Accuracy
Monitors grounding resistance values, connection resistance values and other data, accurately recording grounding resistance data with monitoring accuracy up to 0.001 ohm.
Strong Weather Resistance
Aluminum alloy material (anti-corrosion design, fearless of wind, rain, lightning), protection class up to IP65, suitable for long-term outdoor harsh environment operation.
Smart Alarm Push
Features on-site alarm and network remote alarm functions, supports historical data query, real-time notification of abnormal status to operations personnel.
Multi-Communication Support
Can connect to the gateway via RS485/Zigbee/Ethernet/4G, transmitting various data to the cloud service system.
Wide Temperature Range, Strong Weather Resistance
Operating temperature -20°C~60°C, aluminum alloy anti-corrosion housing, fearless of wind, rain, lightning, suitable for long-term outdoor harsh environment operation.
Quick Module Replacement Design
Adopts modular structure, can be quickly replaced during on-site operations, reducing downtime and improving maintenance efficiency.
Selection Guide
Model Naming Rules
| Model | Mounting Location | Measurement Method | Explosion-Proof | Acquisition Point | RS485 | ZIGBEE | Ethernet | 4G |
|---|---|---|---|---|---|---|---|---|
| FR-01011-R | Outdoor | Three-Point Method | None | Grid Resistance | √ | --- | --- | --- |
| FR-01011-Z | Outdoor | Three-Point Method | None | Grid Resistance | --- | √ | --- | --- |
| FR-01011-E | Outdoor | Three-Point Method | None | Grid Resistance | --- | --- | √ | --- |
| FR-01011-G | Outdoor | Three-Point Method | None | Grid Resistance | --- | --- | --- | √ |
| FR-02011-R | Outdoor | Three-Point Method | None | Resistance + Ground Voltage | √ | --- | --- | --- |
| FR-02011-Z | Outdoor | Three-Point Method | None | Resistance + Ground Voltage | --- | √ | --- | --- |
| FR-02011-E | Outdoor | Three-Point Method | None | Resistance + Ground Voltage | --- | --- | √ | --- |
| FR-02011-G | Outdoor | Three-Point Method | None | Resistance + Ground Voltage | --- | --- | --- | √ |
Technical Specifications
Basic Parameters
| Operating Voltage | DC 12V(default)/ DC 24V/AC 220V(optional) |
| ProductsPower Consumption | ≤2W |
| Operating Temperature | -20℃~60℃ |
| Operating Humidity | <95% |
| ProductsWeight | 7kg |
| Dimensions | 260*260*107mm |
| Housing Material | Aluminum alloy |
| Protection Class | IP65 |
| Mounting Method | Side mounting with M7 screws |
Smart Monitoring Functions
| Communication Method | RS485/Zigbee/Ethernet/4G |
| Communication Protocol | Modbus protocol/MQTT protocol |
| Grounding Resistance | 0.01Ω~2000Ω,0.01Ω |
| Measurement Method | Precision three-wire measurement |
| Measurement Interval | 1 min/cycle |
| Resistance Accuracy | ±2%rdg±3dgt |
| Grounding Voltage | 0.1V~600V,0.1V |
| Voltage Accuracy | ±2%rdg±5dgt |
Installation Instructions
Installation dimensions
Interface diagram
Interface Definition
| No. | Definition |
|---|---|
| 1 | Interface 1: Monitor grid (E) |
| 2 | Interface 2: Auxiliary ground electrode 1 (P) |
| 3 | Interface 3: Auxiliary ground electrode 2 (C) |
| 4 | Interface 4: Communication Interface; Ethernet cable port when using Ethernet; antenna port when using wireless; no wiring when using RS485 |
| 5 | Side interface: For wireless or Ethernet communication, DC12V Power Supply interface, brown-blue two-core wire, brown-12V, blue-0V |
| 6 | Side interface: For RS485, red-12V, black-0V, green-RS485_A, yellow-green-RS485_B |