Soil Moisture, Temperature, and EC Sensors Also known as soil volumetric water content sensors

Sensors / Soil Moisture, Temperature, and EC Sensors

About Soil Moisture, Temperature, and EC Sensors

Soil moisture sensors (sometimes referred to as volumetric water content sensors) measure the water content of soil. These sensors can be used to estimate the amount of stored water in a profile or how much irrigation is required to reach a desired amount of water in the soil. These sensors can be used for quick measurements or installed for long-term measurements.

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Retired Products

Product Line

	Water Content Accuracy	Soil Suitability	Required Equipment	Measurements Made	Sensors	Rods
SoilVue 10 TDR Soil Moisture Profile Sensor	Volumetric Water Content: ±1.5% typical with most soils Soils with high organic matter (> 12% soil organic carbon) or high clay content (> 45% clay) may need a soil-specific calibration due to the dispersive nature of these materials.	—	—	Volumetric water content (VWC), permittivity, electrical conductivity (EC), and temperature	—	—
CS655 12 cm Soil Water Content Reflectometer	Volumetric Water Content: ±1% (with soil-specific calibration) where solution EC < 3 dS/m Volumetric Water Content: ±3% (typical with factory VWC model) where solution EC < 10 dS/m	Short rods are easy to install in hard soil. Suitable for soils with higher electrical conductivity.	Measurement system	Soil electrical conductivity (EC), relative dielectric permittivity, volumetric water content (VWC), soil temperature	Not interchangeable	Not replaceable
CS650 30 cm Soil Water Content Reflectometer	Volumetric Water Content: ±1% (with soil-specific calibration) Volumetric Water Content: ±3% (typical with factory VWC model) where solution EC < 3 dS/m	Long rods with large sensing volume (> 6 L) are suitable for soils with low to moderate electrical conductivity.	Measurement system	Soil electrical conductivity (EC), relative dielectric permittivity, volumetric water content (VWC), soil temperature	Not interchangeable	Not replaceable
CS616 30 cm Water Content Reflectometer	±2.5% VWC (using standard calibration with bulk EC of ≤ 0.5 dS m^-1, bulk density of ≤ 1.55 g cm^-3, and measurement range of 0% to 50% VWC)	Long rods and lower frequency are well-suited for soft soil with low electrical conductivity (< 2 dS/m).	Measurement system	Volumetric water content (VWC) of porous media (such as soil)	Not interchangeable	Not replaceable
HS2 HydroSense II Handheld Soil Moisture Sensor	Probe Options: 3% typical (Accuracy assumes solution EC of < 4 dS/m when using the CS658 20-cm probe.) Probe Options: 3% typical (Accuracy assumes solution EC of < 6.5 dS/m when using the CS659 12-cm probe.)	Short rods are easy to install in hard soil. Suitable for soils with higher electrical conductivity.	HS2 is a complete system.	Volumetric water content (VWC) of porous media (such as soil)	Interchangeable sensors; can swap the 12 cm and 20 cm sensors with the reader.	Replaceable

Other Considerations

	Water Content Accuracy	Soil Suitability	Required Equipment	Measurements Made	Sensors	Rods
TDR200 Time-Domain Reflectometer	—	—	Measurement system	Volumetric water content (VWC) of porous media (such as soil), soil electrical conductivity (EC), rock mass deformation	—	—