Soil Moisture Sensor & Temperature Sensor
SunBio's professional research-grade monitoring systems are engineered for precision agriculture, smart irrigation automation, and long-term subterranean soil health tracking across commercial farms and greenhouses.
88%
Water SavedIP68
Submersible
Handheld Soil Moisture & Temperature Sensor Device
Empower precision agriculture, horticultural studies, and farm automation with the Handheld Soil Moisture Sensor. Designed for agronomists, researchers, and professional farmers, this portable meter delivers instantaneous volumetric water content (VWC) and soil core temperature readings. Built with robust corrosion-resistant austenitic 316 stainless steel pins.
Dual-Parameter
Monitors VWC and core temperature simultaneously.
High Precision
Moisture accuracy within 5% and ±0.5? thermal precision.
IP68 Weatherproof
Epoxy encapsulated body built for saline soils.
Modbus RS485
Seamless integration with industrial PLCs and loggers.
Soil Moisture Device Standalone (IoT Gateway Node)
Transform traditional farming into smart precision agriculture with the SunBio Standalone IoT Soil Moisture Node. Featuring built-in wireless modules, cloud telemetry, and long-lasting battery backup, this automated unit keeps you updated on subsurface root conditions 24/7, reducing water wastage and preventing over-irrigation.
24/7 Telemetry
Continuous monitoring with automated alerts.
Cloud Dashboards
Real-time web and mobile management portals.
Analytics
Moisture curves and CSV/PDF export capabilities.
Cloud Native
Native AWS IoT and Microsoft Azure support.
Advanced Soil Science & Irrigation Formulas
Governing principles of volumetric water content, soil tension energy states, and depletion thresholds.
Volumetric Water Content (VWC)
Water content measures the volume of liquid water per unit volume of soil, establishing absolute hydration percentages for precision irrigation.
VWC = Volume of Water / Total Soil Volume
Water Potential & Soil Suction
Reflects the energy state of water. Surface adhesion binds moisture to soil particles; tighter binding reduces potential energy.
Deficit = (VWCFC - VWCCurrent) X Root Depth
Dielectric Capacitance & Salinity
High-frequency measurement polarizes water molecules between stainless steel electrodes without polarizing salt ions.
Dielectric Constant e = f(Charge Storage)
Borehole Placement & MAD
Place sensors at one-third and two-thirds root-zone depth. Trigger irrigation when depletion reaches Management Allowable Depletion (MAD).
MAD Trigger = (Current Depletion / Available Water) = 50%
Technical Specifications
Soil Moisture Range
0% to 100% VWC
Temperature Range
-40°C to 80°C
Temperature Accuracy
±0.5°C high precision
Ingress Protection
IP68 Submersible
Operating Voltage
3.3V to 5V DC
Communication
Wi-Fi, 4G, RS485 Modbus
Frequently Asked Questions
Detailed technical answers and clear explanations for agronomists and farmers
A soil moisture sensor measures volumetric water content (VWC) and core temperature using advanced dielectric capacitance technology. Because water has a high dielectric constant (approx. 80) compared to air (1) and soil minerals (3-5), the sensor measures charge-storing capacity between stainless steel electrodes, transmitting data via wireless or Modbus RS485 protocols.
Unlike basic resistive modules (such as YL-69) that use direct DC current and corrode rapidly due to electrolysis, SunBio sensors utilize high-frequency dielectric polarization, corrosion-resistant 316 stainless steel alloy pins, and IP68 waterproof epoxy encapsulation for long-term commercial accuracy.
Water content (VWC) is an extensive variable representing absolute percentage of water per soil volume. Water potential (soil suction) is an intensive variable representing energy state, reflecting how tightly water molecules bind to soil particles via surface adhesion.
By monitoring root-zone moisture levels 24/7 relative to field capacity and Management Allowable Depletion (MAD), SunBio IoT nodes trigger automated push alerts or valve actions before water percolates past root zones, optimizing usage by up to 40%.
Drill a pilot hole slightly smaller than the probe, insert perpendicularly into undisturbed soil, and compact firmly around it. Avoid oversize holes which create air gaps; air has a dielectric constant of 1 and distorts capacitance readings.
Yes! SunBio sensors support standard industrial protocols including Modbus RTU RS485, 4-20mA, 0-5V, 0-10V, and USB, ensuring seamless connection with PLCs, ESP32, and Raspberry Pi gateways.