Siemens milltronics TEST CHAIN, Instruction Manual

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Page 2 Test Chain – INSTRUCTION MANUAL 7ML19985JD01
Application Examples
The application examples used in this manual illustrate typical installations that use the
test chain. Other configurations may also apply.
In all examples, substitute your own application details. If you require more information,
please contact your Siemens Milltronics representative. For a complete list of Siemens
Milltronics representatives, go to: www. siemens.com/processautomation.
Test Chain Calibration
Test chain calibration is used extensively for testing mechanical belt scales, and to
calibrate high capacity electronic 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.
CAUTION: Please consider the following:
• Ensure accessibility to the top (load) side of the conveyor 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).
Test Chain.book Page 2 Tuesday, April 19, 2005 9:34 AM