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 liter 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 minimizes 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 analog signal means no-hassle integration with systems manufactured by other companies. An on-board voltage regulator allows the Decagon 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.

 

Advantages of the 10HS

  • Volumetric water content is the only measurement you need
  • Simple sensor with excellent accuracy
  • Large volume of influence

ACCURACY

Apparent Dielectric Permittivity (εa): ± 0.5 from εa of 2 to 10, ± 2.5 from εa of 10 to 50

Soil Volumetric Water Content (VWC): Using standard calibration equation: ± 0.03 m3/m3(± 3% VWC) typical in mineral soils that have solution electrical conductivity < 10 dS/m; using soil specific calibration, ± 0.02 m3/m3 (± 2% VWC) in any soil

RESOLUTION

εa: 0.1 from εa of 1 to 30, 0.2 from εa 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

εa: 1 (air) to 50

VWC: Calibration dependant; up to 0 - 57% VWC with polynomial equation

MEASUREMENT TIME 10 ms
SENSOR TYPE Capacitance (frequency domain)
OUTPUT 300 - 1250 mV, independent of excitation voltage
OPERATING ENVIRONMENT

Survival Temperature: -40 - 50°C

Operating Temperature: 0 - 50°C

POWER REQUIREMENTS 3 VDC @ 12 mA to 15 VDC @ 15 mA
CABLE LENGTH

Sensors come standard with 5 m cable. Custom cable lengths available. Maximum cable length of 40 m. Please contact Decagon if you need longer cable lengths.

CABLE CONNECTOR TYPES

3.5mm "stereo" plug, or stripped and tinned lead wires (3)

SENSOR DIMENSIONS

14.5 cm x 3.3 cm x 0.7 cm

DATA LOGGER COMPATIBILITY 
(NOT EXCLUSIVE)

Decagon Em50 Series, ProCheck, Campbell Scientific

WARRANTY

One year, parts and labor

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, Em50G, ProCheck, ECH2O Check, Campbell Scientific* Em5b, Em50, Em50G, ProCheck, ECH2O Check, Campbell Scientific* Em5b, Em50, Em50G, 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, Em50G, ProCheck, Campbell Scientific*, SDI-12 capable Em50, Em50G, ProCheck, SDI-12 capable Em50, Em50G, 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