User manual

Hukseflux Thermal Sensors
HFP01SC Manual v0811 page 25/33
6 Installation of HFP01SC
HFP01SC is generally installed at the location where one wants
to measure at least 4 cm depth below the surface. A typical
depth of installation is 5 cm.
Typically 2 sensors are used per measurement location in order
to promote spatial averaging, and to have some redundancy for
improved quality assurance. Sensors are typically several
meters apart.
The more even the surface on which HFP01SC is placed the
better. When covering HFP01SC with the medium, it should be
done such that the medium below and on top is the same.
Usually this means that it is safest either to install HFP01SC
from the side. When installing by digging a hole, it is
recommended to dig the hole some 40 mm deeper than the
location of HFP01SC so that eventually the disturbance of the
soil is the same above and below the sensor.
For the self-calibrating principle to work properly, the sensor
must be installed at least for 40 mm below the surface.
In meteorological applications, permanent installation is
preferred. It is recommended to fix the location of the sensor
by attaching a metal pin to the cable. Attachment of the pin to
the cable can be done using a tie-wrap.
Table 6.1 General rules for installation of HFP01SC. In case of
exceptional applications, please contact Hukseflux.