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Description
3.1
Test chain calibration
Test chain calibration is used extensively for testing belt scales, and to calibrate high capacity
belt scales and weighfeeders that cannot be calibrated to material tests.
During the calibration, the test chain is applied to the conveyor belt and is secured at both
ends so that the chain remains stationary over the weigh length. The chain rolls on the
surface of the moving belt conveyor, providing dynamic scale loading of a known weight
value, and thus supplying the calibration reference.
Advantages
The roller test chain simulates live material loading by causing the belt's structure to deflect in
much the same manner as when material is present.
A much greater test load can be applied to high capacity belt scales and weighfeeders
because most weighbridge designs can only accommodate a limited number of static weights
applied to the suspension. The high capacity test load is especially important on systems
using mechanical weighing elements and lever systems because they calibrate the systems
with test load values close to normal operating loads.
Note
• Ensure accessibility to the top (load) side of the conveyer belt in the scale area.
• Secure and remove the test chains each time they are used.
• Provide routine inspection and maintenance.
• Lubricate regularly and repair as necessary to ensure safe reliable service.
• Weigh and measure chain annually to determine the correct and accurate load value
(required to compensate for wearing and stretching of the test chain components).
6
Operating Instructions, 10/2021, A5E32310082-AB
3
Milltronics Test Chain
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