COMPONENT

CS650/CS655

Soil Water Content Reflectometers

Overview

The CS650/CS655 Soil Water Content Reflectometers use

innovative techniques to monitor soil volumetric water

content, bulk electrical conductivity, and temperature.

The probe consists of two 30-cm-long (for CS650) and two

12-cm-long (for CS655) 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.

www.campbellsci.eu/cs650_655

More info: +44(0) 1509 828 888

Measures soil values

Using innovative techniques

80 Hathern Road, Shepshed, LE12 9GX UK | +(0)1509 828888 | sales@campbellsci.co.uk | www.campbellsci.eu

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Benefits and Features

Measures the following soil values:

- volumetric water content

- bulk electrical conductivity (EC)

- soil temperature

- dielectric permittivity

SDI-12 output

Serial connection for sensor configuration

Robust water content measurement even with high bulk EC

Larger sample volume reduces error from spatial variability of

measured parameters

Measurement corrected for effects of soil texture and

electrical conductivity

Measurement Method

The CS650/CS655 measures propagation time, signal

attenuation, and temperature. Dielectric permittivity,

volumetric water content, and bulk electric 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-1 (CS650) or ≤8 dS m-1 (CS655) 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.

Common applications of the CS650/CS655 include irrigation

scheduling, soil-water transport and flow studies, soil-water

model validation, and soil-water balance analyses. It can also be

used to compare the effects of varying soil conditions on a plant’s

health.

CS650

CS655