Sensor Integration and Material Calibration Chapter 3
Configuration and Calibration Guide HD0679 Rev 1.2.0 37
2. To determine the water in the material the dry weight must be calculated using the
following equation:
Dry weight =
( %)
(Moisture %: 1=100%, 0.1 = 10%)
Sand
.
= 879.63
Stones
.
= 1014.63
Cement
= 300
Total dry weight = 879.63 + 1014.63 + 300 = 2194.26kg
3. Calculate the water in the material:
Water Content = Wet weight – Dry weight
Sand = 950-879.63 = 70.37 kg
Stones = 1040-1014.63 = 25.37 kg
Cement = 300 – 300 = 0 kg
Total water = 70.37+25.37+0 = 95.74kg
4. The dry weight and the water content are then used to calculate the moisture % of the
material:
M% =
100
M% =
.
.
100 = . %
5. To create a calibration point the dry material must be loaded into the mixer and mixed
thoroughly until the sensor signal is stable, this indicates that the mix is homogenous.
Once the signal is stable, record the sensors Unscaled value. In this example the value
was 35 Unscaled.
6. To create a second calibration point add a set amount of water to the mixer, in this
example 35 litres is added. Thoroughly mix the material until the sensor signal is again
stable. Record the sensors Unscaled value, in this example it is 46 Unscaled.
7. Calculate the moisture % of the wet mix using the following equation:
Total water = Dry material water + Added water
Total water = 95.74 + 35 = 130.74 litres
Moisture % =
100
Moisture % =
.
.
100 = . %
8. The Unscaled values and Moisture % from the dry and wet mixes are used to create the
calibration.
The calibration data for the mix is:
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