Siemens Milltronics Operating Instructions Manual

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Milltronics Test Chain6 Operating Instructions, 10/2021, A5E32310082-ABDescription 33.1 Test chain calibrationTest chain calibration is used extensively for testing belt scales, and to calibrate high capacitybelt 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 bothends so that the chain remains stationary over the weigh length. The chain rolls on thesurface of the moving belt conveyor, providing dynamic scale loading of a known weightvalue, and thus supplying the calibration reference.AdvantagesThe roller test chain simulates live material loading by causing the belt’s structure to deflect inmuch the same manner as when material is present.A much greater test load can be applied to high capacity belt scales and weighfeedersbecause most weighbridge designs can only accommodate a limited number of static weightsapplied to the suspension. The high capacity test load is especially important on systemsusing mechanical weighing elements and lever systems because they calibrate the systemswith 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).