2017-05-12
User Manual
SONO-MIX MINI Version 2_7
Page 15
the PLC in the more wet mixture. It is recommended to average the values over the last 5
seconds of the mixing time. In this example a measurement value of 10811 has been recorded
with the PLC.
SONO-MIX
Measurement
values
(current signal
from 4…20mA)
Measurement
value in a PC
(without unit)
Digit Value of
A/D-Converter
PLC
without unit from 0
to max. 32768
digits
Measurement
values of dry
mixture
7.968 mA
6.2
8126
This is the
Dry-value-A/D
Measurement
values of
more wet
mixture
7.232mA
4.3%
10811
This is the more
wet
value-A/D
This is the
PLC value
where the
concrete mixture
has exactly 20.0
liter more water
inside.
Note: For prefab concrete with higher flow spread, it is recommended to record the wet
measurement values without concrete plasticizer in the mixture. The reason is that the
plasticizer modifies the density of the fresh concrete considerably, which leads to deviations in
the measurement values.
3.
Determination of the
Sensitivity
of the SONO-MIX for this recipe:
For calibration and calculation of the mixing water for further mixtures, the coefficient
c1-Sensitivity of the SONO-MIX can be calculated easily in the following way:
c1-Sensitivity
= (10811
– 8126) / 20.0 liter =
134.25
digits PLC per liter water
Attention:
This sensitivity is a value for the concrete volume which is used in this procedure for
e.g. 1.0 cubic meter concrete. For higher or partial volumes it is necessary to calculate the added
water content up or down, dependent on the volume.
Because the SONO-MIX measures moisture precise also with different grain size distribution, it is possible
to calculate with a standard c1-Sensitivity for similar recipes. For very different recipes, e.g. recipes with
coloring agents or other added special materials it is recommended to check the c1-Sensitivity and if
necessary determine a new c1-Sensitivity.
