Product Overview

The FDR Soil Moisture Sensor CH-150 utilizes advanced FDR technology to simultaneously measure three parameters: 
soil moisture content, soil electrical conductivity, and temperature.
It features a radio-frequency transmission line structure consisting of three needle-shaped electrodes. 
By using signals of different frequencies and measuring the resulting phase changes, it calculates the signal propagation speed.
The propagation speed corresponds to the soil’s dielectric constant, 
which is then used to calculate the soil’s volumetric moisture content.

What is an FDR soil moisture sensor?

The FDR soil moisture sensor is a smart sensing device that uses FDR technology to accurately measure moisture content,

temperature, and humidity in the soil.FDR technology (Frequency Domain Reflectometry) may sound complex,

but its core principle is quite ingenious: the sensor emits electromagnetic waves of a specific frequency into the soil

and uses differences in the soil’s dielectric constant to derive moisture content data.
At the same time, a built-in thermistor simultaneously detects subtle changes in temperature. Simply put,

the FDR sensor performs an “electromagnetic CT scan” of the soil.
The amount of moisture directly affects the electromagnetic wave feedback;

the sensor captures these changes and instantly converts the physical signals into precise electrical signals.

FDR technology completely eliminates measurement errors caused by ions in water—which may be present in fertilizers,

such as potassium salts, phosphate fertilizers, and ammonium bicarbonate—
or by salt content and varying water hardness across different locations.

Key Product Features

Features a three-pin RF transmission line structure for strong interference resistance;

FDR high-frequency measurement technology, offering higher accuracy compared to other measurement solutions;

High accuracy and high resolution, with moisture content accuracy as high as ±1% (after calibration);

Excellent long-term stability with minimal drift;

Short measurement time and fast response;

Resistant to salt interference and highly adaptable;

Supports a wide input voltage range: 6V–18V;

Industrial-grade RS485 interface, suitable for long-distance deployment.

Three Measurement Methods

Six Major Application Scenarios

1. Smart Agricultural Irrigation: Precise Water Control · 30–50% Water Savings · Automatic Irrigation,

2. Greenhouse Management: Integrated Water and Fertilizer Application · Precision Care for High-Value Crops,

3. Lawn and Landscape Maintenance: Remote Monitoring · On-Demand Irrigation · Reduced Labor Costs,

4. Geohazard Early Warning: Landslide Early Warning · Integrated Alarms · Protecting Lives,

5. Building Foundation Inspection: Foundation Safety · Construction Quality · Compliance with Acceptance Standards,

6. Ecological Research: Long-Term Monitoring · Ecological Assessment · Carbon Sink Measurement.

Product Specifications

Parameters

Scope

Notes

Voltage Range

Temperature Measurement Range