Campbell HydroSense II Series, Руководство по эксплуатации продукта

Страница: 24 / 50

HS2 and HS2P
12
The screen will show MEASURING… while the measurement is taken. After
3 to 4 seconds, the soil profile page will be shown with the reference value
changed. Repeat this process for the remaining wet or dry set point.
If desired, the soil profile can be cleared by selecting CLEAR SOIL then .
The CLEAR SOIL operation cannot be undone.
The sensor length stored in a soil profile is automatically updated to match the
sensor used whenever the wet and dry reference values are changed. If the
sensor length used to change one of the references is different to that
previously used for the soil profile, the following screen will be shown.
Selecting NEW PROBE will overwrite the soil profile, clearing the other
reference value, whereas selecting OLD PROBE will discard the measurement
and leave the soil profile unchanged. This feature forces both reference values
to use the same rod length. This step cannot be reversed. Using ,
select the desired option and press to accept or to discard the new
measurement and return to the soil profile screen.
Once the soil profile changes are complete, use to choose SELECT
THIS SOIL and press . This will return to the main screen
(p. 15)
and use
the new soil profile.
6.4.3 Storage
The HydroSense II does not store relative water content or deficit
measurements to flash. Only water content measurements are stored.
6.4.4 Proper Measurement Technique and Limitations
6.4.4.1 Measurement Principle
The HydroSense II uses soil dielectric permittivity to estimate volumetric water
content. Dielectric permittivity of water is much greater than that of other soil
NOTE