Soil Moisture Sensor & Temperature System
Sun Bio IT Solutions Private Limited delivers professional research-grade monitoring systems engineered for precision agriculture, smart IoT irrigation automation, and long-term subterranean soil health tracking across commercial farms, greenhouses, and research plots.
88%
Water SavedIP68
Submersible
Handheld Soil Moisture & Temperature Meter
Empower precision agriculture, horticultural research, and farm automation with SunBio's portable soil moisture sensor. Designed by Sun Bio IT Solutions Private Limited, this meter delivers instantaneous volumetric water content (VWC) and soil core temperature readings via 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 hardware loggers and controllers.
Standalone IoT Soil Moisture Gateway Node
Transform traditional farms into smart precision operations with the SunBio soil moisture sensor IoT 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 to prevent 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 ε = 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%
Soil Moisture Sensor Working Principle & Compatibility
Understanding capacitive dielectric technology, resistance methods, and hardware integration.
Capacitive vs Resistive Tech
Unlike cheap resistive modules (like the YL-69) that use direct DC current and corrode via electrolysis, professional capacitive soil sensors use an alternating electric field to measure charge-storing capacity, drastically extending lifespan in wet soil.
Microcontroller & PLC Integration
Engineered for seamless integration with professional hardware controllers, data loggers, smart farm gateways, ESP32, and Raspberry Pi via Modbus RTU RS485 and analog/digital output options.
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 commercial growers
A soil moisture sensor measures volumetric water content (VWC) and core soil temperature using high-frequency dielectric capacitance or TDR technology. Because water has a high dielectric constant (approx. 80) compared to air and dry soil minerals (3-5), the sensor isolates water polarization from dissolved ions, transmitting real-time telemetry data via Modbus RTU RS485 protocols.
Capacitive soil sensors measure dielectric permittivity using an insulated electric field, preventing metal corrosion and salt degradation. In contrast, resistive sensors use exposed metal pins that suffer rapid DC electrolysis and rust quickly in damp soil environments.
Yes. SunBio sensors support standard industrial and maker protocols including Modbus RTU RS485, 4-20mA loops, 0-5V analog outputs, and USB, making them compatible with professional PLCs, ESP32 modules, and Raspberry Pi data loggers.
By continuously tracking root-zone moisture levels 24/7 relative to Field Capacity (FC) and Management Allowable Depletion (MAD), SunBio soil moisture sensor nodes trigger automated alerts or controller valves before water percolates past root zones—optimizing water usage by up to 40% and preventing nutrient runoff.
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.
Volumetric 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.