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Model：
HD-DJ7
Introduction：
Online Conductivity Sensor measures water conductivity and temperature with RS485 output and internal signal isolation. Widely used for environmental water testing, industrial and high/low ionic strength water samples....
The HD-DJ7 online conductivity 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 continuous online conductivity measurement.
1. Contact electrode method with a wide measuring range up to 10,000 µS/cm.
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).
| Measurement principle | Contact electrode method |
| Signal output | RS485 (MODBUS-RTU) |
| Measurement range | 0–10,000 µS/cm |
| Resolution | 1 µS/cm |
| Accuracy | ±1.5%, ±0.1 °C |
| Response time | Approx. 30 s (98% in still liquid) |
| Housing material | ABS and 316L stainless steel |
| 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 |
| Connector | M12 aviation plug, 5-pin female socket |
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 5-core shielded cable: brown - power supply (12–24 VDC), black - ground (GND), blue - RS485-A, green - RS485-B, yellow - 4–20 mA current output (may be left floating if unused). 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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