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Seeed Studio  |  SKU: 101990982

Seeed Studio S-Multi Soil MTEC-01B | RS485 Modbus-RTU Multi-Depth Soil Moisture, Temperature & EC Sensor | 4-Layer, IP68, Aviation Connector

€442,00
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An IP68 multi-depth soil sensor measuring moisture, temperature, and EC at four root-zone depths via RS485 Modbus-RTU for smart agriculture and precision irrigation.

  • Depths: 10, 20, 30, 40cm | 3 parameters per layer
  • Accuracy: T ±0.5°C | M ±3% | EC ±10%
  • Output: RS485 Modbus-RTU | 9600bps | PLC ready
  • Build: IP68 | 795mm Probe | 10m Cable | 12–24V DC

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Description

The Seeed Studio S-Multi Soil MTEC-01B is a professional-grade multi-depth soil sensor that simultaneously measures soil moisture, temperature, and electrical conductivity (EC) at four discrete depths — 10 cm, 20 cm, 30 cm, and 40 cm — from a single probe. Based on the internationally standard dielectric constant method, the sensor delivers stable, accurate readings of true volumetric water content across virtually all soil types, with high resistance to salinity interference. Data is transmitted via the RS485 Modbus-RTU protocol for direct integration with PLCs, data loggers, SCADA systems, and IoT gateways. The 795 mm anti-corrosion plastic probe is IP68-rated for permanent in-ground installation, includes a 10 m cable with 5-pin aviation connector, and features multi-directional misconnection protection on power, ground, and signal lines. Ideal for precision agriculture, greenhouse cultivation, smart irrigation, scientific research, and large-scale environmental monitoring deployments.

Core Capabilities

4-Layer Multi-Depth Sensing Simultaneously monitors soil temperature, moisture, and electrical conductivity at 10 cm, 20 cm, 30 cm, and 40 cm from a single probe, providing a complete vertical soil profile for root zone analysis, irrigation planning, and salinity stratification monitoring.
Dielectric Constant Sensing Internationally recognised method for measuring volumetric soil moisture. Less affected by soil salinity than traditional resistive sensors, delivering high-accuracy readings (±3% moisture, ±0.5°C temperature) across sandy, loamy, and clay soil types.
IP68 Anti-Corrosion Construction Reinforced plastic shell with anti-aging properties and resistance to acidic and alkaline soil conditions. IP68 rating supports permanent in-ground installation including long-term water immersion without leakage or sensor drift.
Universal RS485 Modbus-RTU Output Modbus-RTU over RS485 (default 9600 bps, slave address 49) connects directly to PLCs, data loggers, SCADA systems, and IoT gateways including the SenseCAP Sensor Hub 4G Data Logger. Configurable slave address (0–255) supports multi-sensor daisy-chain bus deployments.

Typical Applications

• Precision Agriculture & Smart Irrigation: Optimise water and fertiliser usage by monitoring root zone moisture, temperature, and EC at multiple depths in real time. Trigger irrigation only when needed and prevent over-watering, leaching, and salinity build-up.
• Greenhouse & Controlled Environment Cultivation: Track soil conditions in commercial greenhouses, polytunnels, and indoor vertical farms producing flowers, vegetables, and high-value crops, enabling data-driven climate and irrigation control.
• Environmental & Hydrological Monitoring: Deploy in catchment areas, forests, vineyards, and conservation projects to monitor soil water dynamics, groundwater recharge, drought stress, and salinity penetration with vertical resolution.
• Scientific Research & Soil Testing: Used in agronomy, soil science, and plant cultivation research to study root-zone water movement, nutrient transport, and salinity gradient effects on plant performance under varied field conditions.

Technical Integration

The S-Multi Soil MTEC-01B communicates via RS485 Modbus-RTU with Function Codes 0x03 (read holding), 0x04 (read input), 0x06 (write single), and 0x10 (write multiple). Default communication parameters: 9600 bps, 8 data bits, no parity, 1 stop bit, slave address 49 (decimal). Twelve read registers (0x0000–0x000B) deliver temperature, moisture, and EC values for each of the four depths simultaneously. The 5-pin aviation connector supports direct integration with the Seeed SenseCAP Sensor Hub 4G Data Logger for cellular IoT deployments, or with any RS485-compatible PLC, SCADA system, or IoT gateway. The 10 m waterproof cable enables flexible deployment of the data logger or junction box at a convenient surface location. For multi-node bus design or platform integration guidance, contact the ShopIoT technical team.

Installation Notes

Installation requires drilling a vertical hole with an earth auger at the target measurement location, preparing a fine soil slurry from the excavated material, and grouting the sensor in place by slowly rotating it downward until the 0 cm reference line is flush with the ground surface. Do not pull the sensor upward during installation, as this introduces air pockets that affect measurement accuracy. Allow the slurry to stabilise before commencing data collection. Full step-by-step installation guidance is provided in the included user manual.

Specifications
  • Primary Communication Protocol
    Modbus RTU (RS485)
  • Configuration Method
    Modbus Commands
  • Environment Rating
    Outdoor, Industrial
  • IP Rating
    IP68
  • Operating Temperature
    -30°C to 70°C
  • Power Consumption
    12V / 40 mA, 24V / 20 mA
  • Measurement Technology
    • Dielectric Constant (soil moisture)
    • Digital Temperature Sensor
    • EC (electrical conductivity)
  • Measurement Range
    • Soil Temperature: −30°C to +70°C
    • Soil Moisture: 0% to 70%
    • Soil EC: 0 to 5,000 µs/cm (extensible to 20,000 µs/cm)
  • Measurement Accuracy
    • Temperature: ±0.5°C
    • Moisture: ±3%
    • EC: ±10%
  • Measurement Resolution
    • Temperature: 0.1°C
    • Moisture: 0.1%
    • EC: 10 µs/cm
  • Interfaces (I/O)
    RS485 (Modbus RTU), M12/F 5-pin Connector
  • Monitoring Parameters
    Soil Moisture (VWC), Soil Temperature, Soil EC (Conductivity)

Document Library

Multi-depth Soil Sensor user Manual

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