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Multiparameter Soil Water Sensor

Campbell Scientific

The CS650 is a multiparameter smart sensor that uses innovative techniques to monitor soil volumetric water content, bulk electrical conductivity, and temperature. It outputs an SDI-12 signal that many of our dataloggers can measure. 

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

Benefits and Features
  • More accurate water content measurements in soils with bulk EC up to 3 dS m-1 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