- Multi-parameter Water Analyzer
- Single-Parameter Water Aalyzer
- DO Sensor
- Trace DO Sensor
- CO₂ Sensor
- COD Sensor
- EC TDS Sensor
- Salinity EC TDS Sensor
- TSS Sensor
- Turbidity Sensor
- PH Sensor
- ORP
- Ion Selective Sensor
- Ammonia Nitrogen Sensor
- Oil in Water Sensor
- Blue-Green Algae Sensor
- Chlorophyll Sensor
- Residual Chlorine Sensor
- Marine Current Sensor
China Suppliers Factory RS485 Four-Electrode Conductivity Sensor for EC, Salinity, TDS Water Quality Monitoring
| Product Name | Four-electrode salinity/conductivity/TDS sensor |
| Range | Conductivity: 0.1~500 mS/cm Salinity: 0–500 ppt TDS: 0–500 ppt |
| Accuracy | Conductivity: ±1.5% Salinity: ±1 ppt TDS: 2.5% FS |
| Power | 9–24 VDC (Recommended: 12 VDC) |
| Material | Polymer Plastic |
| Size | 31mm × 140mm |
| Working Temperature | 0–50℃ |
| Cable Length | 5m, can be extended according to user need |
| Sensor Interface Supports | RS-485, MODBUS Protocol |
The innovative four-electrode structure minimizes polarization effects, significantly improving measurement accuracy compared to traditional two-electrode sensors. This design ensures stable performance even in high-conductivity or ion-rich solutions, making it ideal for challenging water quality scenarios.
With a broad range covering conductivity (0.1–500 mS/cm), salinity (0–500 ppt), and TDS (0–500 ppt), the sensor adapts to diverse water types—from pure freshwater to concentrated seawater. Its full-range automatic switching eliminates user error by dynamically adjusting to the detected parameters, ensuring hassle-free operation.
The corrosion-resistant polymer electrode and housing material withstand harsh chemical environments, making the sensor suitable for long-term submerged use in seawater, industrial wastewater, or chemically treated water. The flat surface design reduces biofouling and debris accumulation, simplifying maintenance and ensuring consistent data reliability.
An isolated power supply design mitigates electromagnetic interference, ensuring stable signal transmission and data integrity in electrically noisy industrial settings. This feature is critical for applications requiring continuous monitoring, such as automated process control systems.
Support for the standard MODBUS RTU protocol via RS-485 enables seamless connectivity to a wide range of control systems, PLCs, and data loggers. This compatibility streamlines integration into existing water quality management networks, facilitating real-time data collection and remote monitoring.
Designed for versatile use, the sensor operates effectively in both freshwater and seawater environments, with a compact form factor and G3/4 threaded connections for easy installation in pipelines, tanks, or open-water monitoring stations. Its robust build ensures reliable performance across varying temperatures and pressure conditions.
Monitors seawater salinity and conductivity in real time to optimize aquaculture environments and prevent salinity fluctuations from harming aquatic life.
Tracks ion concentration in wastewater to assist desalination processes and chemical dosing control, ensuring regulatory compliance.
Deployed long-term in coastal or deep-sea areas to monitor conductivity changes and assess pollution or salinity anomalies.
Controls purity and salinity of process water to ensure product quality and production stability.
Supports high-precision water analysis for oceanography, environmental science, and data collection in research fields.
Monitor nutrient solution conductivity in hydroponic systems to optimize fertilizer delivery and irrigation, ensuring balanced plant growth. The sensor's ease of cleaning and corrosion resistance make it suitable for frequent use in controlled agricultural environments.
| Parameter | Model | Range | Accuracy |
| DO Sensor | LMS-DO10B | 0–20 mg/L, 0–60℃ | ±0.1–0.3 mg/L |
| DO Sensor | LMS-DO10C | 0–20 mg/L, 0–60℃ | ±0.3 mg/L |
| Trace DO Sensor | LMS-TDO100 | 0–2000 ppb, 0–50℃ | ±1 ppb |
| PH Sensor | LMS-PH100 | 0–14 pH | ±0.02 pH |
| ORP Sensor | LMS-ORP100 | ±1000.0 mV | ±0.2 mV |
| EC/TDS Sensor | LMS-TDS102 | CT: 0–9999 uS/cm; 0–100 mS/cm TDS: 0–10000 ppm |
±2.5% FS |
| Salinity/EC/TDS Sensor | LMS-SAL104 | Conductivity: 0.1–500 mS/cm TDS: 0–60000 ppm Salinity: 0–500.00 ppt |
±1.5% FS |
| COD Sensor | LMS-COD100 | COD: 0.1–1500 mg/L TOC: 0.1–750 mg/L BOD: 0.1–900 mg/L Turbidity: 0.1–4000 NTU Temperature: 0–50℃ |
±5% equiv. KHP Temperature: ±0.5℃ |
| TSS Sensor | LMS-TSS100 | 0–50000 mg/L / 0–120000 mg/L | ±10% FS or 10 mg/L |
| Turbidity Sensor | LMS-TUR10L | 0–100 NTU | ±10% FS or 0.3 NTU |
| Turbidity Sensor | LMS-TUR10H | 0–3000 NTU | ±10% FS or 0.3 NTU |
| CO₂ Sensor | LMS-CO2100 | 2000 PPM / 10000 PPM / 50000 PPM | ±5% FS |
| Ammonia Nitrogen Sensor | LMS-NH4100 | 0–1000 mg/L | ±5% FS |
| Ion Selective Sensor | LMS-ION100 | 0–1000 mg/L | ±5% FS |
| Oil in Water Sensor | LMS-OIL100 | 0–50 mg/L; 0–5 mg/L | ±3% FS |
| Chlorophyll Sensor | LMS-CHL100 | 0–500 ug/L | ±3% FS |
| Blue-Green Algae Sensor | LMS-BGA100 | 0–2,000,000 cells/ml | ±3% FS |
| Residual Chlorine Sensor | LMS-HCLO100 | 0–20.00 ppm | ±5% FS |
| Marine Current Sensor | LMS-Current100 | Temperature: -3℃–45℃ Velocity of flow: 0–500 cm/s Flow direction: 0–359.9° |
±0.05℃ ±1 cm/s or ±2% ±2° |
