DM-SA01 Soil Moisture Sensor

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DM-SA01 Soil Moisture Sensor

Product ID：HZNStrcd025

Price: Please inquire PDF Format

Supply Ability:50 SETS/MON

Port:SHENZHEN

Product Introduction
Other information

Model NumberDM-SA01

Brand NameNJDANMO

Payment TermsTT，PAYPAL，Alibaba.com Pay

DM-SA01 Soil Moisture Sensor

Product Introduction
The DM-SA01 Soil Moisture Sensor is a high-precision, high-sensitivity soil moisture sensor based on Frequency Domain Reflectometry (FDR) technology. It is designed for accurate measurement of soil volumetric water content and provides fast response, stable output, and good sensor interchangeability.
The sensor is calibrated using the actual soil drying and weighing method, providing reliable measurement accuracy. Its measurement performance is only slightly affected by soil salinity, making it suitable for different soil types.
With a fully sealed and vacuum-potted construction, corrosion-resistant electrodes, and IP68 protection, the DM-SA01 can be buried in soil for long-term monitoring or directly immersed in water for dynamic measurement.

Key Features
• FDR measurement technology: Uses frequency domain reflectometry and high-frequency electronics for accurate soil moisture measurement.
• High measurement accuracy: Accuracy is ±2% within 0–50% and ±3% within 50–100% m³/m³.
• Fast response: Rapid response and stable output support real-time soil moisture monitoring.
• Low salinity sensitivity: Less affected by soil salt content and suitable for various soil types.
• Durable stainless-steel electrodes: Specially treated corrosion-resistant electrodes withstand mechanical impact and long-term use.
• Fully sealed construction: Vacuum-potted and sealed with flame-retardant epoxy resin.
• IP68 protection: Suitable for long-term underground installation and water immersion.
• Multiple output options: RS485 Modbus, 0–2 V voltage, or 4–20 mA current output.
• Flexible installation: Probe-type design allows direct insertion into soil for reliable measurements.
• Customizable cable length and range: Standard cable length is 2 m, with customized cable lengths and measurement ranges available.

Working Principle
The DM-SA01 Soil Moisture Sensor operates based on the Frequency Domain Reflectometry (FDR) principle.
The sensor generates a high-frequency electromagnetic signal through its probe electrodes. Because water has a significantly different dielectric constant from dry soil, changes in soil water content cause corresponding changes in the electromagnetic characteristics around the probe.
The sensor detects these changes and converts them into a soil volumetric water content (VWC) value. The internal electronic circuit processes and calibrates the signal before outputting the measurement through RS485 Modbus, 0–2 V, or 4–20 mA.
The probe is calibrated using actual soil drying and weighing measurements, helping provide accurate and stable readings across different soil conditions.

Technical Parameters

Parameter	Specification
Model	DM-SA01
Measurement Parameter	Soil Volumetric Water Content (VWC)
Measurement Range	0–100% m³/m³
Optional Ranges	30%, 50%, or customized range
Accuracy	±2% (0–50%); ±3% (50–100%) m³/m³
Operating Temperature	-40°C to +60°C
Supply Voltage	12–24 V DC
Core Chip Temperature Resistance	85°C
Protection Rating	IP68
Probe Material	Special corrosion-resistant electrode
Sealing Material	Black flame-retardant epoxy resin
Standard Cable Length	2 m, customizable
Probe Length	55 mm
Probe Diameter	4 mm
Sensor Outer Diameter	50 mm
Output Signals	RS485 (Modbus), 0–2 V, or 4–20 mA
Measurement Area	Cylindrical area approx. 7 cm diameter × 7 cm height, centered around the probe
Calibration Method	Soil drying and weighing method

Applications
The DM-SA01 Soil Moisture Sensor is suitable for long-term soil moisture monitoring and water content measurement in:
• Scientific research: Soil science, agricultural experiments, and environmental research.
• Precision irrigation: Real-time soil moisture monitoring for water-saving irrigation.
• Greenhouses: Soil moisture monitoring for greenhouse vegetables, flowers, and crops.
• Agriculture: Crop growth monitoring and irrigation management.
• Grassland and pasture: Soil water condition monitoring.
• Rapid soil testing: Portable or fixed soil moisture measurement.
• Plant cultivation: Monitoring moisture conditions during plant growth.
• Wastewater treatment: Water and moisture-related monitoring applications.
• Grain storage: Monitoring moisture conditions of stored agricultural products.
• Granular materials: Measurement of moisture content and temperature in suitable granular materials.

DM-SA01 vs. Conventional Soil Moisture Measurement

Feature	DM-SA01 Soil Moisture Sensor	Conventional Soil Moisture Measurement
Measurement Principle	FDR	Often drying/weighing or other methods
Measurement Type	Real-time volumetric water content	Usually laboratory or periodic measurement
Response	Fast	Generally slower
Long-Term Monitoring	Supported	Often inconvenient
Soil Salinity Influence	Relatively low	Method dependent
Installation	Direct insertion/burial	Often requires sampling
Protection	IP68	Depends on equipment
Output	RS485 / 0–2 V / 4–20 mA	Often manual data recording
Remote Monitoring	Easy to integrate	Usually limited
Cable Customization	Available	Depends on instrument
Field Application	Excellent	Often more labor intensive

FAQ
1. What does the DM-SA01 measure?
The DM-SA01 primarily measures soil volumetric water content (VWC) from 0 to 100% m³/m³.
2. What measurement principle does the DM-SA01 use?
It uses Frequency Domain Reflectometry (FDR) and high-frequency electronic technology to determine soil moisture based on changes in the dielectric characteristics of the soil.
3. How accurate is the DM-SA01?
The specified accuracy is ±2% within 0–50% m³/m³ and ±3% within 50–100% m³/m³.
4. Can the sensor be buried in soil for a long time?
Yes. Its fully sealed, vacuum-potted construction and IP68 protection make it suitable for long-term soil burial and continuous monitoring.
5. Is the DM-SA01 affected by soil salinity?
The sensor is designed to be less affected by soil salt content than many conventional measurement methods and can be used in various soil types.
6. What output signals are available?
Three output configurations are available: RS485 with Modbus protocol, 0–2 V voltage output, and 4–20 mA current output.
7. Can the cable length be customized?
Yes. The standard cable length is 2 m, and customized cable lengths can be supplied according to installation requirements.
8. Can the DM-SA01 be used in water?
Yes. The sensor has an IP68 protection rating and can be directly immersed in water for long-term dynamic monitoring when the application is compatible with the sensor's measurement requirements.
9. What is the measurement area of the soil moisture sensor?
The effective measurement region is approximately a cylinder with a 7 cm diameter and 7 cm height, centered around the central probe.

FAQ
1. What does the DM-SA01 measure?
The DM-SA01 primarily measures soil volumetric water content (VWC) from 0 to 100% m³/m³.
2. What measurement principle does the DM-SA01 use?
It uses Frequency Domain Reflectometry (FDR) and high-frequency electronic technology to determine soil moisture based on changes in the dielectric characteristics of the soil.
3. How accurate is the DM-SA01?
The specified accuracy is ±2% within 0–50% m³/m³ and ±3% within 50–100% m³/m³.
4. Can the sensor be buried in soil for a long time?
Yes. Its fully sealed, vacuum-potted construction and IP68 protection make it suitable for long-term soil burial and continuous monitoring.
5. Is the DM-SA01 affected by soil salinity?
The sensor is designed to be less affected by soil salt content than many conventional measurement methods and can be used in various soil types.
6. What output signals are available?
Three output configurations are available: RS485 with Modbus protocol, 0–2 V voltage output, and 4–20 mA current output.
7. Can the cable length be customized?
Yes. The standard cable length is 2 m, and customized cable lengths can be supplied according to installation requirements.
8. Can the DM-SA01 be used in water?
Yes. The sensor has an IP68 protection rating and can be directly immersed in water for long-term dynamic monitoring when the application is compatible with the sensor's measurement requirements.
9. What is the measurement area of the soil moisture sensor?
The effective measurement region is approximately a cylinder with a 7 cm diameter and 7 cm height, centered around the central probe.