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HD-DJ21
Introduction：
Online Water Temperature Sensor measures water temperature in real time online. Widely used for industrial cooling, wastewater treatment, aquaculture, environmental monitoring and HVAC systems to ensure efficient, safe operation....
The HD-DJ21 online water temperature sensor is widely used in industrial cooling, wastewater treatment, aquaculture, environmental monitoring, HVAC systems and other fields. It monitors water temperature in real time so that systems run efficiently and safely: power plants and chemical plants monitor cooling water temperature to prevent equipment overheating, aquaculture farms regulate water temperature to promote growth, and environmental monitoring assesses the ecological health of water bodies. Because the working environment varies greatly, the sensor is waterproof, corrosion-resistant and immune to interference.
1. Measuring range -20 to 85 °C with an accuracy of ±0.1 °C and a resolution of 0.1 °C.
2. RS485 (MODBUS-RTU) signal output.
3. Single-point calibration.
4. ABS housing with IP68 protection for long-term immersion.
5. NPT 3/4 thread for simple immersion mounting.
6. Low power consumption of 0.25 W at 12 V.
| Signal output | RS485 (MODBUS-RTU) |
| Measurement range | -20 to 85 °C |
| Accuracy | ±0.1 °C |
| Resolution | 0.1 °C |
| Housing material | ABS |
| Cable length | 5 m standard |
| Power supply | 12–24 VDC |
| Power consumption | 0.25 W at 12 V |
| Calibration | Single-point calibration |
| Waterproof rating | IP68 |
| Mounting | Immersion mounting, NPT 3/4 thread |
Keep at least 5 cm from the side wall and 10 cm from the bottom.
The cable is a 4-core shielded cable: red - power supply (12–24 VDC), blue - 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.
When measurement error appears after long service, recalibrate the sensor with a host instrument. If maintenance no longer restores calibration and measurement, the sensor has failed and should be replaced.
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