Decagon 10HS Soil Moisture Sensor

Larger Volume of Influence

Use the 10HS to accurately measure water content where a large volume of influence is needed, with minimal salinity and textural effects in most soils.

Characterize Spatial Variability

The 10 cm long 10HS has a ~1.3 litre area of influence. Reference our Application Note to see the idealized measurement volume of the 10HS.

Engineered for Accuracy

The 10HS determines volumetric water content (VWC) by measuring the dielectric constant of the soil using capacitance/frequency domain technology. Using a 70 MHz frequency minimises salinity and textural effects, making the 10HS accurate in most soils. Factory calibrations can be used in most typical soils with a saturation extract EC of 10 dS/m.

Easy Integration

The 10HS's analogue signal means no-hassle integration with systems manufactured by other companies. An on-board voltage regulator allows the factory calibrations to be used with any excitation voltage between 3 and 15 V.

Use with the Topp Equation

The 10HS's output can be set to dielectric for use with the Topp Equation or other dielectric-to-volumetric water content conversion equations.

Reasons to pick the 10HS:

  • If you're focused on water content only and are interested in a large volume of inluence.
  • Volumetric water content is the only measurement you need

  • Simple sensor with excellent accuracy

Accuracy Apparent dielectric permittivity (Ea): ±0.5 from Ea of 2 to 10, ±2.5 from Ea of 10 to 50
VWC: Using standard calibration equation: ±0.03 m3/m3 (±3% VWC) typical in mineral soils that have solution electrical conductivity <10dS/m
Using soil specific calibration, ±0.02
(±2% VWC) in any soil
Resolution Ea: 0.1 from Ea of 1 to 30, 0.2 from Ea of 30 to 50/>
VWC: 0.0008 m3/m3 (0.08% VWC) in mineral soils from 0 to 0.50 m3/m3 (0-50% VWC)
Range Ea: 1 (air) to 50
VWC: calibration dependant; up to 0-57% VWC with polynomial equation
Measurement Time 10mS
Sensor Type Frequency domain
Output Voltage correlated with VWC, independent of excitation voltage
Operating Environment -40°C - 50°C
Power 3 VDC @ 12mA to 15 VDC @ 15mA
Cable Length 5m, custom cable lengths available
Cable Connector Types 3.5mm stereo jack plug or stripped and tinned lead wires (3)
Sensor Dimensions 14.5cm x 3.3cm x 0.7cm
Data Logger Compatibility (not exclusive) METER: Em50, Em50G
Campbell Scientific: CR10X, 21X, 23X, CR1000, CR3000, etc.
Other: Any data acquisition system capable of 3-15 VDC excitation and single ended voltage measurement at 12 bit or better resolution.
Warranty One year, parts and labour

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10HS Volume


Click here for the Soil Sensors Comparison Page.

10HS Manual
Size: 337.0 KB (345,139 bytes)

Soil Sensors Quick Start Guide
Size: 1.5 MB (1,533,464 bytes)

Environmental Catalogue
Size: 2.5 MB (2,581,813 bytes)

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