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 Compu-M. 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 Compu-M load display during running
conditions or by calculation.
load =
rate
speed
*calculation example: % compensation =
4.2 - 4.9 x 100
4.9
= - 14.3
Compu-M material test
tonnes
Compu-M
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
actual weight per material test
totalized weight by Compu-M
belt scale response
linearized Compu-M response
% compensation
span (100%)
load - kg / m
weight - tonnes
PL-516 36
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