Soil Moisture Sensors (Volumetric Water Content)

Measurements:

Applications:

  • Publication ready: thousands of peer-reviewed publications use Decagon soil moisture sensors. View a selection here
  • Calibrated in a variety of soils for accurate results
  • Insensitive to soil salinity and soil texture in typical soils
  • Plug-and-play with Decagon data loggers—no programming
  • Compatible with non-Decagon data loggers using industry standard protocols

Watch our short video on how to install soil moisture sensors

ANALOG SENSORS  
SENSOR EC-5 10HS GS1
MEASURES volumetric water content, dielectric permittivity volumetric water content, dielectric permittivity volumetric water content, dielectric permittivity
VOLUME OF INFLUENCE 240 mL 1320 mL 1430 mL
DATA LOGGER COMPATIBILITY Em5b, Em50 Series, ProCheck, ECH2O Check, Campbell Scientific* Em5b, Em50 Series, ProCheck, ECH2O Check, Campbell Scientific* Em5b, Em50 Series, ProCheck, ECH2O Check, Campbell Scientific*

MEASUREMENT RANGE

0 to 100% VWC 0 to 57% VWC 0 to 57% VWC
BEST IF

VWC is all that you need.

You're establishing a large sensor network.

You want a large measurement volume.

VWC is all that you need.

You're establishing a large sensor network.

You're installing in the side wall of a trench.

You need the most rugged sensor available.

BUT NOT IF You cannot apply a regulated voltage (only applies to non-Decagon data loggers).

You are measuring in nursery pots.

You are installing in rocky soil.

You are installing sensors down bore holes.

 

DIGITAL SENSORS  
SENSOR 5TM 5TE GS3 MAS-1  
MEASURES volumetric water content, dielectric permittivity, temperature volumetric water content, dielectric permittivity, temperature, electrical conductivity volumetric water content, dielectric permittivity, temperature, electrical conductivity volumetric water content  
VOLUME OF INFLUENCE 715 mL 715 mL 160 mL 450 mL  
DATA LOGGER COMPATIBILITY Em50 Series, ProCheck, Campbell Scientific*, SDI-12 capable Em50 Series, ProCheck, SDI-12 capable Em50 Series, ProCheck, SDI-12 capable Any logger with 4-m20 mA input (not compatible with Decagon data loggers or ProCheck)  

MEASUREMENT RANGE

0 to 100% VWC

-40 to 60 °C

0 to 100% VWC

-40 to 60 °C

0 to 23 dS/m

0 to 100% VWC

-40 to 60 °C

0 to 25 dS/m

0 to 100% VWC

-40 to 60 °C

 

 

BEST IF

Measure High temperature variability.

Data must be corrected for temperature effects.

Using SDI-12.

You are managing salts in your system.

You want to use SDI-12.

You are measuring water content of soilless substrates.

You need high accuracy EC.

You are working with a PLC with a 4-20 mA input.

You need extremely long cable lengths.

 

BUT NOT IF N/A You want to monitor soiless substrates or potting soils. You are installing sensors down bore holes.

You want to use Decagon data loggers or ProCheck.

You need a low-power system.

 

Compatibility and Programming Specifications for Campbell Scientific and Other (non-Decagon) Data Loggers

Note: ECH2O sensors are “plug and read” on Decagon data loggers. You do not need to program any of this information (or ANY information) into a Decagon logger.

SENSOR CAMPBELL COMPATIBILITY OTHER LOGGERS OUTPUT VOLTAGE REQUIREMENTS
EC-5 CR10X, 21X, 23X, CR1000, CR3000, etc. Any data acquisition system capable of switched 2.5 to 3.6 V excitation and single ended voltage measurement at 12 bit or better resolution. (Note: some people take their chances with resolution as low as 3 bits, but resolution lower than 10 bits will leave the data quite choppy). Voltage, correlated linearly (soil) or polynomially (growing media) with VWC 2.5-3.6 V
10HS CR10X, 21X, 23X, CR1000, CR3000, etc. Any data acquisition system capable of 3-15 VDC excitation and single ended voltage measurement at 12 bit or better resolution. Voltage correlated with VWC, independent of excitation 3-15 V
5TE Any logger with serial I/O (CR10X, CR850, CR1000, CR3000, etc.) Ask a Decagon representative for an integrator’s guide to interfacing the 5TE Digital ASCIII stream or SDI-12 3.6-15 V
5TM Any logger with serial I/O (CR10X, CR850, CR1000, CR3000, etc.) Ask a Decagon representative for an integrators guide to interfacing the 5TM Digital ASCII Stream or SDI-12 3.6-15 V
GS3 Any logger with serial I/O (CR10X, CR850, CR1000, CR3000, etc.) Ask a Decagon representative for an integrators guide to interfacing the GS3 Digital ASCII Stream or SDI-12 3.6-15 V
GS1 CR10X, 21X, 23X, CR1000, CR3000, etc. Any data acquisition system capable of 3-15 VDC excitation and single ended voltage measurement at 12 bit or better resolution. Voltage correlated with VWC, independent of excitation 3-15 V
MAS-1 Any logger with 4-20 mA output Any logger with 4-20 mA output 4-20 mA 12-32 VDC continuous

 

GS1 Rugged, Low Cost Soil Moisture Sensor

  • Inexpensive, ruggedized soil moisture sensor
  • Measure VWC in a harsh environment
  • Large volume of influence

GS3 Ruggedized Soil Moisture, Temperature, and Electrical Conductivity Sensor

  • Volumetric water content, temperature, & electrical conductivity
  • Excellent point sensor (0.16 L measurement volume)
  • Epoxy body, stainless steel needles, digital, SDI-12

EC-5 Small Soil Moisture Sensor

  • Measures volumetric water content
  • Small size ideal for pots and nurseries
  • 0.24 L measurement volume

10HS Large Soil Moisture Sensor

  • Measures volumetric water content
  • 1.3 L measurement volume

5TM Soil Moisture & Temperature Sensor

  • Measures volumetric water content and temperature
  • 0.7 L measurement volume
  • Digital, SDI-12

5TE Soil Moisture, Temperature, & Electrical Conductivity Sensor

  • Measures volumetric water content, temperature, & electrical conductivity
  • 0.7 L measurement volume

MAS-1 4-20 milliamp Volume Soil Moisture

  • Measures volumetric water content
  • Standard 4-20 mA output for PLC systems.

RT-1 Soil Temperature Sensor

  • Measures Soil Temperature
  • Expoxy body, stainless steel casing for long life
  • For use with Decagon data loggers only