Section 7 Calibration
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7.3 Calibration
7.3.1 General Information
Calibration is a correlation of weight and count rate. It should,
therefore, be carried out carefully. The weight is determined with a
comparative weigher. Since any errors of this comparative weigher
will later falsify the results, the weigher should be highly accurate
and preferably a registered one.
Before starting comparative weighing, it is important to find
a way of comparing exactly the same amount of material on
both weighers.
Due to tare determination, we know the first calibration point al-
ready: the zero point. The shape of the calibration curve is deter-
mined by the position of the calibration points and the calibration
mode. Several points have to be plotted, however, in order to av-
erage out measuring errors. At each measurement point, you
should work with a different load. The more the load of a calibra-
tion point differs from another calibration point, the better the cali-
bration.
The result of a comparative weighing is an average value of
the weights per area occurring during this time. For this
reason, the accuracy of the curve determination is the bet-
ter, the more constant the load during weighing!
The evaluation system has space for up to 10 comparative weigh-
ings per product.
7.3.2 External Product Selection
If different products or materials with different composition are
conveyed, these products may be calibrated in another menu sec-
tion. These menu section are called products. External control of
such products is possible via the digital inputs. A maximum of four
different products can be controlled via the digital inputs.
Below we will only describe the calibration for the 1
st
product, since
the procedure for other products is the same.
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