34
Handling the Lancehead-Shaped Probe
SONO WZ
Translation of the Original Instructions for Use
In theory, the penetration depth of the
electromagnetic field lines extends in-
finitely into the material to be measured.
However, the effective measurement-
relevant penetration depth of the lance-
head-shaped probe is max. 5 cm around
the probe surface on the dark-coloured
ceramic plate.
With regard to the measuring field intensity,
it must be taken into consideration that all
dielectric measurement methods such as
TDR, microwave and the capacitive meas-
uring process, are not linear but feature
exponential field line distribution, i.e. the
field line intensity is greatest for all meas-
uring methods directly at the probe head
and decreases exponentially moving away
from the probe head. This is a physical
principle and cannot be changed construc-
tively. As a consequence, for humidity
probes this now means that larger gravel
positioned directly at the head of the
probe can falsify the measurement value.
When measuring with the SONO WZ, it is
a question of changing the depositional
relationship of sand, cement and bigger
gravels so that a representative mix of
materials is produced with multiple indi-
vidual measurements. This is achieved by
carrying out several individual measure-
ments using different depositional relation-
ships on the probe head.
Measuring Characteristics of the Lancehead-Shaped Probe
