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RS485 MODBUS-RTU Soil NPK Measure Sensor

SKU: SEN0605

This NPK Detection Sensor detects soil fertility (N, P, K). It has 5-30V wide voltage, RS485 output, fast response, and stable output. Compatible with Arduino UNO R3 + TTL to 485 board. IP68 protection, vacuum-sealed with black flame-retardant epoxy. Probe: 316 stainless steel (rust-proof, waterproof, anti-corrosion, salt-alkali, long electrolysis resistance). Small, long-term burial, suitable for various soils. Note: data is reference only, not professional-grade accurate.

Overview of MODBUS-RTU RS485 Soil NPK Measure Sensor

Downloadable Resources

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  • Tech Specs

    • Specification

    Parameter Specification
    Power supply voltage DC5-30V
    Power consumption 0.15W@12V
    Output mode RS485
    Detection parameters Nitrogen（N）、Phosphorus（P）、Potassium（K）
    NPK range 0-2999mg/kg (mg/L)
    Resolution 1mg/kg (mg/L)
    Accuracy ≤5% (subject to the actual measuring instrument)
    Protection level IP68
    Probe material anti-corrosion special electrode
    Sealing material black flame retardant epoxy resin
    Working temperature -40°C~+60°C
    Size 123x45x15mm
    Cable length 2m

    Pinout

    Num Label Description
    Brown line VCC Power input positive pole, DC5-30V power supply
    Black line GND Power ground wire
    Yellow line 485-A RS485 data line A
    Blue line 485-B RS485 data line B

    FAQ

    • Hello, Can several of these sensors be connected to the RS485 Shield for Arduino that you sell? I just placed the order and I have that question. Thanks in advance.

      The address register is a single register, and the address of that register is 0x07D0, so your command word is not 0x10, it should be 0x06. also, 0x02 in the penultimate byte should be 0x01.

    • Possible reasons for no output or output errors

      1. The computer has a COM port, but the selected port is incorrect.

      2. TTL to 485 module operation/programming toggle switch selection is incorrect.

      3. Wrong baud rate.

      4. The 485 bus is disconnected, or the A and B lines are connected reversely.

      5. If there are too many devices or the wiring is too long, power supply should be provided nearby.

      Equipment damage.

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