SN-3002-TR-ECTHNPKPH-N01 Five-Pin Soil Multi-Parameter Sensor (Temperature, Moisture, pH, EC, NPK) - RS485 Modbus

The sensor uses the RS485 Modbus-RTU protocol. To connect to a microcontroller like an Arduino, you will need an RS485 to TTL/UART converter module (e.g., MAX485). For industrial PLCs with built-in RS485 ports, you can connect directly using twisted-pair wiring, ensuring proper termination and addressing as per the Modbus protocol. Always refer to the sensor's datasheet for the specific register map for each parameter (temperature, moisture, pH, EC, N, P, K).

The sensor has a wide operating voltage range of 4.5V to 30V DC. A 12V battery or solar power system is perfectly suitable. This flexibility allows for deployment in remote field locations without the need for regulated 5V or 3.3V supplies, making it ideal for off-grid agricultural and environmental monitoring stations.

Yes, with its IP68 waterproof rating and corrosion-resistant housing materials, the sensor is engineered for long-term, in-situ soil burial. The sealed construction protects the internal electronics and electrodes from moisture ingress, salt damage, and electrolysis, ensuring stable performance and longevity even in chemically active or saline soils.

For accurate pH and NPK readings, periodic calibration is recommended. The frequency depends on usage intensity and soil conditions. For research-grade accuracy, calibrate before a major monitoring campaign and after prolonged use (e.g., every 3-6 months). The sensor's stable electrochemical design minimizes drift, but calibration with standard solutions ensures measurement fidelity over time.