36
Handling the Lancehead-Shaped Probe
SONO WZ
Translation of the Original Instructions for Use
Fresh concrete should always be meas-
ured in a plastic bucket, because this pre-
vents metal parts affecting the result. Due
to the expansion of the measurement
field, a bucket with approx. 10 l capacity
should be selected as shown below
(Fig. 12). The bucket height must be large
enough to ensure that there is still suffi-
cient space at the bottom of the bucket
when inserting the probe.
In order to prevent any separation, the
fresh concrete inside the bucket should
not be shaken. After inserting the probe,
the concrete can be compacted a little by
knocking the bucket 2-3 times with the
foo,t so that the fresh concrete encloses
the surface of the probe around the dark
ceramic surface, making sure there are no
air pockets (Fig. 14).
PERI recommends carrying out at least
4 to 5 measurements with the probe im-
mersed at an angle of 70° to 90° at differ-
ent places along the edge of the bucket
(Fig. 13).
– Ensure that there is no concrete residue
on the ceramic part of the probe sur-
face. If necessary, clean the surface
with a wire brush.
– The bucket should be filled at least
3 cm higher than the head of the probe
(<18 cm). Especially with high water
content, ensure that the concrete does
not separate during or due to the meas-
uring procedure.
– Completely insert the probe head into
the concrete at a slight angle from the
edge of the bucket. Compact concrete
in the bucket by knocking on the side.
This ensures that the fresh concrete on
the probe surface is optimally compressed
for the measuring procedure.
Measuring Procedure in a Plastic Bucket
