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Model：
HD-DJ7H
Introduction：
Water TDS Sensor (Water Salinity Sensor) measures conductivity, TDS and salinity in water with RS485 output and internal signal isolation. Widely used for environmental and industrial water quality monitoring....
The HD-DJ7H online sensor is intended for environmental water quality monitoring and for water samples of high or low ionic strength. It satisfies the requirements of most industrial and environmental applications for the online measurement of conductivity, salinity and TDS.
1. Contact electrode method with a high range covering conductivity, salinity and TDS.
2. Internal signal isolation technology for strong interference immunity.
3. Good reproducibility, thermal stability and low drift, with a compact body and fast response.
4. 3/4 NPT pipe thread for simple immersion mounting or installation in pipelines and tanks.
5. Stable performance and long service life, with an IP68 waterproof rating.
6. Automatic temperature compensation (M1820Z) for all three parameters.
| Measurement principle | Contact electrode method |
| Signal output | RS485 (MODBUS-RTU) |
| Conductivity range | 0–30,000 µS/cm; 0–30 mS/cm |
| Conductivity resolution | 1 µS/cm; 0.01 mS/cm |
| Salinity range | 0–10,000 ppm; 0–30 ppt |
| Salinity resolution | 1 ppm; 0.01 ppt |
| TDS range | 0–10,000 ppm; 0–30 ppt |
| TDS resolution | 1 ppm; 0.01 ppt |
| Accuracy | ±1.5%, ±0.1 °C |
| Response time | Approx. 30 s (98% in still liquid) |
| Housing material | ABS |
| Temperature compensation | Automatic (M1820Z) |
| Cable length | 5 m standard |
| Power supply | 12–24 VDC (0.4 W @ 12 V) |
| Operating environment | 0–50 °C (non-freezing), < 0.2 MPa |
| Waterproof rating | IP68 |
| Mounting | Immersion mounting, NPT 3/4 thread |
Do not install the sensor upside down or horizontally; install it at an angle of at least 15° to the horizontal.
The cable is a 4-core shielded cable: red - power supply, blue/black - ground (GND), green - RS485-B, yellow - RS485-A. Check the wiring order carefully before powering on, to avoid unnecessary losses caused by incorrect connection. Cable colours may differ slightly between production batches; the colour print on the cable always prevails.
Electrodes require periodic cleaning and calibration; the interval depends on the actual working conditions. Standard cleaning procedure: remove deposits with a soft brush (do not scratch the electrode surface), rinse with distilled water, then calibrate.
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