Siemens Milltronics BW100 Instruction Manual page 44

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
BW100 load
kg/m
11.6
23.2
34.7
*calculation example: % compensation = 4.2 - 4.9 x 100
20 actual weight per material test
totalized weight by BW100
belt scale response
linearized BW100 response
% compensation
15
span (100%)
10
5
0
Page 40
speed
material test
tonnes
4.2
8.4
12.6
10.5
3
-14.0
10 20
Milltronics BW100 - INSTRUCTION MANUAL
BW100 total
tonnes
4.9
7.6
13.7
4.9
= - 14.3
30
load - kg / m
compensation*
%
-14.3
10.5
-8.0
-8.0
40 50
7ML19985DJ01