Benefits and Features
More accurate water content measurements in soils with bulk EC up to 3 dS m™ without performing a soil-specific calibration
Larger sample volume reduces error
Measurement corrected for effects of soil texture and electrical conductivity
Estimates soil-water content for a wide range of mineral soils
Versatile sensor—measures dielectric permittivity, bulk electrical conductivity (EC), and soil temperature

Technical Description
The CS650 consists of two 30-cm-long stainless steel rods connected to a printed circuit board. The circuit board is encapsulated in epoxy and a shielded cable is attached to the circuit board for datalogger connection.
The CS650 measures propagation time, signal attenuation, and temperature. Dielectric permittivity, volumetric water content, and bulk electrical conductivity are then derived
from these raw values.
Measured signal attenuation is used to correct for the loss effect on reflection detection and thus propagation time measurement. This loss-effect correction allows accurate water content measurements in soils with bulk EC <3 dS m™! without performing a soil specific calibration.
Soil bulk electrical conductivity is also calculated from the attenuation measurement. A thermistor in thermal contact with a probe rod near the epoxy surface measures temperature. Horizontal installation of the sensor provides accurate soil temperature measurement at the same depth as the water content. Temperature measurement in other orientations will be that of the region near the rod entrance into the epoxy body.