The TD series (TD-820/TD-830/TD-860) electrodes adopt a unified appearance design, with only differences in measurement parameters, range, and accuracy, perfectly adapting to the multidimensional monitoring needs of turbidity, suspended solids (SS), and sludge concentration (MLSS). All three electrodes are equipped with infrared scattering light technology and NTC automatic temperature compensation function, supporting sinking/circulating dual installation mode, standard MODBUS RS-485 communication and 10 meter shielded cable, IP68 high protection level ensures stable operation in complex water quality environments, widely used in municipal sewage, industrial wastewater, tap water treatment and other scenarios.
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Parameters
| Specifications | TD-820 (High-Precision Turbidity) | TD-830 (Wide-Range Turbidity) | TD-860 (SS/Sludge Concentration) |
|---|---|---|---|
| Measurement Parameter | Turbidity | Turbidity | Suspended Solids, Sludge Concentration |
| Measurement Range | 0.01-400 NTU | 0-400/2000/4000 NTU | 0-200mg/L / 0-5000mg/L / 0-50000mg/L |
| Accuracy | ≤±2% of measured value | ±5% FS | ≤±10% of measured value (depending on sludge homogeneity) |
| Resolution | 0.001 NTU | 0.001-1 NTU (range-dependent) | 0.001mg/L-1mg/L (range-dependent) |
| Temperature Compensation | NTC automatic temperature compensation | NTC automatic temperature compensation | – |
| Operating Temperature | 0-50℃ | 0-45℃ | 0-45℃ |
| Pressure Range | 0-0.3 MPa | 0-0.2 MPa | ≤0.2 MPa |
| Calibration Method | Standard solution calibration, water sample calibration | Standard solution calibration, water sample calibration | Standard solution calibration, water sample calibration |
| Response Time | 6s < T90 < 300s (adjustable) | 6s < T90 < 300s (adjustable) | 6s < T90 < 300s (adjustable) |
| Power Supply | 9~36 VDC | 9~36 VDC | 9~36 VDC |
| Signal Output | MODBUS RS-485 | MODBUS RS-485 | MODBUS RS-485 |
| Protection Rating | IP68/NEMA6P | IP68/NEMA6P | IP68/NEMA6P |
| Mounting Thread | G3/4” | G3/4” | G3/4” |
| Cable Length | 10m shielded cable (standard) | 10m shielded cable (standard) | 10m shielded cable (standard) |
| Weight | 1.2 KG | 1.2 KG | 1.2 KG |
| Storage Temperature | -15℃~50℃ | -15℃~50℃ | -15℃~50℃ |
| Optional Accessories | PP-88 flow cell (for flow-through installation) | PP-88 flow cell (for flow-through installation) | Submersible mounting bracket |
Unified design and universal operation
Appearance and installation
- The three electrode sizes are consistent (90mm × 190mm × 50mm), all using G3/4 “standard threads, and supporting both submerged and flow-through installation methods:
- Submerged installation: requires a dedicated bracket to be used, immersed in the water sample, avoiding bubble accumulation areas, and the sensor head should be at least 10cm away from the bottom of the container;
- Flow installation: It needs to be equipped with a PP-88 flow channel, and the inlet, overflow, and outlet should be connected with a 12mm inner diameter hose. The exhaust port should be opened before the first water inlet.
Wiring Specification (Unified Core Definition)
| Wire Color | Function | Signal Definition |
|---|---|---|
| Red | Positive Power Supply | +9-36VDC |
| Black | Negative Power Supply | AGND |
| Green | Positive Communication | RS485 A |
| White | Negative Communication | RS485 B |
Calibration & Factory Reset
- Calibration Process:Use Modbus debugging software (like mbpoll.exe) to connect the electrode to a computer.Use Function Code 03 to read calibration addresses and Function Code 06/10 to modify calibration point values. Input the standard solution concentration, wait 10 seconds for stabilization, and save. Up to 10 calibration points are available for precise adjustment.
- Factory Reset: Use Function Code 06 to write “60” to Address 200. A “Response OK” pop-up indicates successful reset; re-calibrate if necessary.
Maintenance Guidelines
- Lens cleaning: Every 2-3 weeks is recommended. Start with clean water. Use a cleaning product and a delicate cloth to remove stubborn spots without scratching;
- Inspect daily: To prevent water infiltration and internal circuit breaking, check electrode housing and cables regularly;
- Prepare standard solution: TD-820/830 uses fumarate standard solution, TD-860 uses diatomaceous earth. Dilute and prepare using A=K * B/C.
Featured Applications
Municipal Water Affairs
- TD-820: High precision turbidity monitoring of filtered water and pure water systems in waterworks;
- TD-830: Monitoring of high turbidity in sewage treatment plant inlet and circulating water;
- TD-860: Monitoring of activated sludge concentration and suspended solids in the sludge return pipe of the biochemical tank.
Industrial production
- TD-820: Control of turbidity in electronic semiconductor ultrapure water and food and beverage production water;
- TD-830: Tracking of circulating water turbidity in the chemical and power industries;
- TD-860: Compliance monitoring of suspended solids concentration in printing and dyeing, papermaking wastewater.
Environmental monitoring
- TD-820: Low turbidity screening of surface water and drinking water sources;
- TD-830: Temporary monitoring of turbidity in rivers and lakes after rain;
- TD-860: Monitoring of suspended solids in industrial park sewage discharge outlets and leachate.
Other scenarios
- TD-820: Laboratory pure water and medical water turbidity detection;
- TD-830: Monitoring of turbidity in aquaculture ponds and landscape water;
- TD-860: Control of suspended solids in mining wastewater and construction wastewater.
Model Selection Guide
- High-precision turbidity monitoring (waterworks with filtered and purified water systems): The TD-820 is chosen because it is accurate to within ± 2%, which is good for tight monitoring demands.
- For medium to high turbidity, the TD-830 can measure turbidity levels from 0.1 to 4000 NTU. It can be used to monitor sewage treatment plant input and industrial circulating water.
- TD-860 is used to monitor the concentration of suspended particles and sludge in biochemical reaction tanks and sludge return pipelines because it has a lot of ranges that may be used to match concentration gradients.
Technical Support
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The TD series electrodes are designed with a unified appearance and differentiated parameter configurations, covering full dimensional monitoring of turbidity, suspended solids, and sludge concentration. Standardized communication, flexible installation and convenient calibration, adapted to the integration requirements of municipal, industrial and environmental protection scenarios, IP68 high protection and stability can ensure long-term reliable operation, making it a cost-effective core component of water quality online monitoring systems.
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