COMPONENTS
CS616
Water Content Reflectometer
High Accuracy
and Precision
Designed for long-term monitoring
Overview
The CS616 measures the volumetric water content (VWC) of
porous media (such as soil) from 0% to saturation. The probe
outputs a megahertz oscillation frequency, which is scaled down
and easily read by a Campbell Scientific datalogger.
www.campbellsci.com/cs616-l
Benefits and Features
Compatible with most Campbell Scientific dataloggers*
High accuracy and high precision
Fast response time
Designed for long-term unattended water content monitoring
Compatible with AM16/32-series multiplexers allowing
measurement of multiple sensors
Probe rods can be inserted from the surface or buried at any
orientation to the surface
questions & quotes:
435.227.9000
Technical Description
The CS616 is comprised of two 30 cm-long stainless steel rods
connected to the measurement electronics. The circuit board is
encapsulated in epoxy, and a shielded four-conductor cable is
connected to the circuit board to supply power, enable probe,
and monitor the output.
The CS616 uses the time-domain measurement method to
measure VWC; a reflectometer (cable tester) such as the TDR100
is not required. This method consists of the CS616 generating an
electromagnetic pulse. The elapsed travel time and pulse reflec-
tion are then measured and used to calculate soil volumetric
water content.
Response Characteristics
The signal propagating along the parallel rods of the CS616
is attenuated by free ions in the soil solution and conductive
constituents of the soil mineral fraction. In most applications,
the attenuation is not enough to affect the CS616 response to
changing water content, and the response is well described by
the standard calibration. However, in soil with relatively high soil
electrical conductivity levels, compacted soils, or soils with high
clay content, the calibration should be adjusted for the specific
medium. Guidance for making these adjustments is provided in
the operating manual.
*
The CS616 is not compatible with our CR200(X)-series, CR7, or CR9000X dataloggers. However, a similar sensor, the CS625, has been
developed specifically for our CR200(X)-series dataloggers. The operating system of older dataloggers might need to be upgraded. Operating
system upgrades are available, at no charge, from: www.campbellsci.com/downloads
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