FDS-400 Soil Temperature, Moisture, Conductivity, and Salinity Sensor

Product Overview

The soil temperature section consists of a precision platinum resistance and a high-accuracy transmitter. The transmitter section includes a power module, temperature sensing module, transmission module, temperature compensation module, and data processing module, which thoroughly eliminates measurement errors introduced by the characteristics of the platinum resistance. The transmitter is equipped with zero-drift and temperature compensation circuits, making it highly adaptable to various usage environments.

The soil moisture section is based on the frequency domain reflection principle and utilizes high-frequency electronic technology to create a high-precision, highly sensitive sensor for measuring soil moisture. By measuring the dielectric constant of the soil, it directly and stably reflects the actual moisture content of various soils and can measure the volumetric percentage of soil moisture.

The soil conductivity salinity sensor uses stainless steel probes to convert the signal into an analog or digital representation of soil conductivity via the transmitter. The signal is then compensated to 25°C using a precision temperature sensor and output as a soil salinity signal, converting the conductivity value into a corresponding analog or digital signal. When buried in the soil, this conductivity salinity sensor directly measures the soluble salt ions in the soil solution. The stainless steel probes offer stable performance, high sensitivity, and a wide measurement range, making them particularly suitable for high conductivity environments and ideal for measuring soil conductivity salinity.

Features

◆ Compact design, high measurement accuracy, fast response time, and excellent interchangeability.

◆ Excellent sealing, allowing direct burial in soil without corrosion.

◆ Minimal soil type influence, suitable for widespread application.

◆ High measurement accuracy, reliable performance, ensuring normal operation, fast response time, and high data transmission efficiency.


Technical Parameters


Measurement Parameters: Soil temperature, soil moisture, soil conductivity (EC value), soil salinity

Measurement Units: °C; %; mS/cm; mg/L

Temperature Range: -30 to 70°C

Moisture Range: 0 to 100%

Conductivity Range: 0 to 20 mS/cm

Salinity Range: 0 to 7500 mg/L

Measurement Accuracy: ±0.3°C; ±3%; within 0～5 mS/cm: ±5%, within 5～20 mS/cm: ±20%; within 0～1875 mg/L: ±5%, within 1875～7500 mg/L: ±20%

Resolution: 0.1°C; 0.1%; 1 uS/cm; 1 mg/L

Probe Length: 5.5 cm

Probe Diameter: 3 mm

Probe Material: Stainless steel

Sealing Material: Epoxy resin

Cable Length: 1.5 meters (standard)

Signal Output:

RS485 Type

Operating Voltage: 5 to 24V

Operating Current: 3 to 5 mA

Output Signal: MODBUS-RTU protocol

Protection Rating: IP68

Application Scope

Suitable for water-saving agricultural irrigation, greenhouses, flowers and vegetables, grasslands and pastures, rapid soil testing, plant cultivation, scientific experiments, underground oil and gas pipelines, and corrosion monitoring of other pipelines.

Dimensions and Weight

Overall Dimensions:



Total Weight: 130g