Designed for water turbidity monitoring, the TD-920/TD-930 series turbidity electrodes have a unified look and installation standard and differ only in range and accuracy. Both electrodes have NTC automatic temperature correction for submerged and flow-through installation. G3/4 “installation threads and dual calibration for reference solution/water sample are standard. They offer steady and dependable turbidity monitoring systems for varying precision and range needs in municipal water affairs, industrial production, and environmental monitoring.
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Parameters
| Specifications | TD-920 (High-Precision Type) | TD-930 (Wide-Range Type) |
|---|---|---|
| Measurement Range | 0.01-400 NTU | 0.1-4000 NTU |
| Measurement Lower Limit | 2 NTU | 20 NTU |
| Accuracy | < ±2% of measured value | < ±5% of measured value |
| Temperature Measurement Range | 0-50℃ | 0-50℃ |
| Pressure Range | 0-0.3 MPa | 0-0.3 MPa |
| Temperature Compensation | NTC automatic temperature compensation | NTC automatic temperature compensation |
| Calibration Method | Standard solution calibration, water sample calibration | Standard solution calibration, water sample calibration |
| Mounting Thread | G3/4” | G3/4” |
| Installation Mode | Submersible, Flow-through (requires PP-88 flow cell) | Submersible, Flow-through (requires PP-88 flow cell) |
| Supporting Accessories | PP-88 turbidity flow cell (for flow-through installation) | PP-88 turbidity flow cell (for flow-through installation) |
| Flow Cell Requirements | Inlet/overflow/outlet connected with 12mm ID hose; Exhaust port opened before initial water intake | Inlet/overflow/outlet connected with 12mm ID hose; Exhaust port opened before initial water intake |
Unified design and universal operation
Appearance and installation
- The two electrodes adopt a consistent structural design, adapt to the same installation accessories and installation process, and reduce selection and operation costs;
- Submerged installation: It needs to be fixed on a dedicated bracket and immersed in the water sample to avoid bubble accumulation areas, ensuring measurement stability;
- Flow installation: It must be equipped with a PP-88 flow channel, and the inlet, overflow, and outlet need to be connected with a 12mm inner diameter hose; After the first water intake or cleaning and drainage, the exhaust port should be opened first, and then closed after normal operation. Keep the drainage port closed on a daily basis.
Core common advantages
- Accurate temperature compensation: NTC automatic temperature compensation technology corrects the impact of environmental temperature on measurement results and is suitable for working environments between 0-50 ℃;
- Convenient and flexible calibration: supports two methods: standard solution calibration and on-site water sample calibration, which can be quickly adjusted according to actual usage scenarios to ensure accurate data;
- Strong installation compatibility: Unified G3/4 “standard thread, flexible switching between submerged and flow-through, suitable for different installation scenarios such as water tanks and pipelines.
General maintenance points
- Regular cleaning: It is recommended to clean the electrode optical window every 2-3 weeks to avoid contamination from affecting measurement accuracy;
- Maintenance of circulation channel: Regularly check the smoothness of the circulation channel pipeline to prevent blockage and measurement abnormalities;
- Calibration cycle: Depending on the complexity of the usage environment, calibration should be performed every 1-3 months to ensure accuracy meets the standard.
Featured Applications
- TD-920: Monitoring of clean water tanks and filtered water in waterworks, preparation of electronic semiconductor ultrapure water, and control of water turbidity in food and beverage production processes;
- TD-930: Turbidity tracking of sewage treatment plant inlet and aeration tank, monitoring of circulating water in the power industry, and compliance testing of turbidity at industrial park wastewater discharge outlets.
Model Selection Guide
- For high-precision demand scenarios like filtered water from water plants, pure water systems, and food and beverage production water, choose TD-920, which has a ± 2% high precision to meet strict water quality monitoring standards.
- For wide-range demand scenarios like sewage treatment plant inlet, industrial circulating water, and surface water after rain, choose TD-930, which has a range of 0.1-4000NTU that can adapt to situations where water turbidity changes a lot.
Circulation slot
Flow type electrodes need to be used in conjunction with flow channels
- Before entering the circulation channel for the first time or after cleaning and draining, it is necessary to open the exhaust port first and then close it after normal operation
- When in use, the inlet, overflow outlet, and outlet all need to be connected with hoses with an inner diameter of 12mm
- Keep the drainage outlet closed during daily use
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The TD-920 and TD-930 ranges of turbidity electrodes provide high-precision and wide-range monitoring with a single design and different parameters. The NTC’s automated temperature correction, dual installation mode, and simple calibration function make it beneficial in environmental protection, occupational safety, and municipal safety. It’s simple to set up and maintain, and the measurements are accurate. Online water turbidity testing is cheap.
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