FDR Soil Moisture Sensor, ±3%/±2%

The FDR soil moisture sensor uses the frequency domain reflection principle, with a measurement range of 0–60% m³/m³ and a response time of less than 500 ms. High-precision soil moisture sensors are available with ±3% or ±2% accuracy (after calibration), and signal output supports 4–20 mA, RS485, or 0–1 VDC/0–2.5 VDC. Power supply voltage: 5–24 VDC/12–36 VDC, making it easy to integrate into various monitoring systems. The humidity sensor housing is made of ABS plastic, with a 316 stainless steel probe, featuring an IP68 protection rating, suitable for long-term outdoor use, and widely applied in precision agriculture and smart irrigation.

Feature

• The soil moisture sensor uses a 100 MHz circuit design to measure the soil moisture content within a 200 mm volume around the sensor probe.
• Low sensitivity in high-salinity and clayey soils, high protection rating (IP68), suitable for long-term burial in soil.
• Wide voltage supply, nonlinear correction, compact size and lightweight design, easy for users to install and carry.
• Features lightning protection and frequency interference suppression design, strong anti-interference capability, equipped with reverse wiring protection, overvoltage protection, and current limiting protection (current output).

Dimension (unit: mm)

FDR Soil Moisture Sensor Multiple Usage Methods

Note

When selecting measurement points, it is important to ensure that the FDR soil moisture sensor and the soil being measured have as good contact as possible. Since the area near the sensor surface has a significant influence, any large gaps around the sensor, excessive soil compaction, or electromagnetic interference between sensors can affect the readings. The soil moisture sensor must not be installed near metal objects or debris. The soil sensor should not be installed on the soil surface at a depth of 5 cm, as it may easily detect the interface between the atmosphere and the soil surface, resulting in meaningless measurements.

Wiring Instruction

RS485 Output

Current Output