Campbell Scientific HydroSense® Soil Water Content System (CS620, CD620) - Manual (Page 9)

HydroSense Soil Water Measurement System (CD620, CS620)
The two-line display provides the following information
1) The volumetric water content in percent (VWC). See Appendix A for
definition of water content.
2) Which probe rod length is selected (see Section 4.4 for rod length
selection).
3) The period of the square wave output from the probe in milliseconds.
4.3 Description of Water Content Measurement Mode
The Water Content Measurement Mode applies calibration coefficients to
the output of the probe to give volumetric water content in percent. The
calibration coefficients reside in the operating system and were determined by
the manufacturer. The calibration was derived from laboratory measurements
in typical agronomic soils. See Section 6.2 for discussion of HydroSense use
in high salinity, high clay or other atypical materials.
4.4 Selecting Probe Rod Length
VWC 22% P12cm
Period 0.93ms
MENU
SELECT
Probe
Exit
MENU
SELECT
Probe
12cm
MENU
SELECT
Probe
20cm
MENU
SELECT
READ
ENTER
FIGURE 4-1. Selecting probe rod length
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