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
97/07/07
BW100 load material test BW100 total compensation*
kg/m tonnes tonnes %
11.6 4.2 4.9 -14.3
23.2 8.4 7.6 10.5
34.7 12.6 13.7 - 8.0
load - kg / m
actual weight per material test
totalized weight by BW100
belt scale response
linearized BW100 response
% compensation
span (100%)
weight = tonnes
RECALIBRATION
PL-531 46
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