CS616 and CS625 Water Content Reflectometers
The response is accurately described over the entire water content range by a
quadratic equation. However, in the typical water content range of about 10%
to about 35% volumetric water content, the response can be described with
slightly less accuracy by a linear calibration equation. The manufacturer
supplied quadratic provides accuracy of
±
2.5% volumetric water content for
soil electrical conductivity
≤
0.5 dS m
-1
and bulk density
≤
1.55 g cm
-3
in a
measurement range of 0% VWC to 50% VWC.
16
18
20
22
24
26
28
30
32
0
0.1
0.2
0.3
0.4
calibration data
linear fit
quadratic fit
Output period (microseconds)
Volumetric Water Content (fractional)
FIGURE 7-1. CS616 and CS625 linear and quadratic calibrations
derived from loam soil
27
Summary of Contents for CS616
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