Campbell Scientific UT20 and UT30 Tower-based Weather Stations - Manual (Page 60)

UT20 and UT30 Tower-based Weather Stations
8.5.14 CS616 Water Content Reflectometer
Probe rods can be inserted vertically or horizontally into the soil surface or
buried at any orientation to the surface. A probe inserted vertically into a soil
surface will give an indication of the water content in the upper 30 cm of soil.
Horizontal installation will detect the passing of wetting fronts. Insertion at a
30 degree angle with the surface will measure water content in the upper 15 cm
of soil.
Probes must be inserted such that no air voids are created around the rods, and
that the rods remain as parallel as possible. Use the CS650G Rod Insertion
Guide with Pilot Rod to minimize errors due to improper insertion (see
FIGURE 8-29).
The standard calibration for the CS616 probe, as programmed in Short Cut, is
valid for loamy soils with low organic content. In other types of soils,
reporting the output in units of period will make it possible to apply your own
calibration during post processing of data.
FIGURE 8-29. CS650G Insertion Guide Tool
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