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Indication of the measurement quality:
The SONO-DIS is calculating the standard deviation StdDev of the single measurements. With StdDev values
of >0.5 the concrete mixture is probably too inhomogeneous, so that it is recommended to make more single
measurements. It is recommended to perform at least 5 to 6 single measurements. At a standard deviation StdDev
less than 0.5 the series of measurements can be stopped and the final result is reliable.
The smileys in the display indicate the reliablilty of the measurement series:
Good (<0,2)
acceptable (0,2 ..0,49)
not acceptable (>0,5).
The SONO-DIS software does not accept water content values lower than 100 liter/m³. This could happen e.g.
if the start button was activated and the probe was not completely inside the fresh concrete. Obviously wrong
measurements are indicated with a warning symbol
at the place of the single measurement value and will not
be used for calculation of the average value!
After finishing of the measurement procedure it is possible to delete measurement values with the button
DOWN
or to go back to the menu of the individual base parameters using the button UP
.
3.2 EC-TRIME - a valuable cement parameter
The main display also shows the radar based Electrical Conductivity parameter EC-TRIME (EC-T). Using and
detecting the electrical attenuation of the radar pulse, SONO-WZ determines further information about cement
type and cement quantity. The raw value EC-TRIME can be used for a preliminary indication about the amount of
cement and the type of cement. Taking the EC-TRIME reading into account, gives another control parameter for
recurrently measured standard concretes.
For the measuring of standard recipes the cement can be monitored with EC-TRIME.
The following graphic shows possible EC-TRIME values at different concrete and cement types. As user of SONO-WZ
and for later controls and better verifications it is to recommend and helpful, to document EC-TRIME with the
respective concrete type. It is to consider that earth moist concretes show lower values for EC
-
TRIME.
NOTE:
An evaluation of EC-TRIME only makes sense, when recurrently the same type of concrete is controlled by the
SONO-WZ.
EC
TRIME
Measurement Range
15dS/m
30dS/m
45dS/m
e.g.concrete with
lower or special cement
e.g. concretes with
higher or special cement
