Page 40 Milltronics BW100 - INSTRUCTION MANUAL 7ML19985DJ01
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Recalibration
Example:
A non-linearity with respect to the ideal response exists in a belt scale application with
design rate of 200 t/h. It is decided to do material tests at 25, 50 and 75% of the design
rate. After performing a zero and a span calibration at 100% of the design rate, followed
by material tests and manual span adjust, three material tests were performed at 50, 100
and 150 t/h, as indicated by the BW100. The following data was tabulated. (This example
is exaggerated for emphasis).
The material tests should be run at same belt speed, representative of normal operation;
in this case 1.2 m/s. For each rate, record the corresponding load value by scrolling to the
BW100 load display during running conditions or by calculation.
load = rate
speed
*calculation example: % compensation = 4.2 - 4.9 x 100
4.9
= - 14.3
BW100 load
kg/m
material test
tonnes
BW100 total
tonnes
compensation*
%
11.6 4.2 4.9 -14.3
23.2 8.4 7.6 10.5
34.7 12.6 13.7 -8.0
5
10
15
20
010
-14.0
10.5
-8.0
20 30 40 50
load - kg / m
weight = tonnes
actual weight per material test
totalized weight by BW100
belt scale response
linearized BW100 response
% compensation
span (100%)
3
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