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Subject: Re: belt weighers

Date: 05/01/00 at 9:16 AM
Posted by: Tim Buehler
E-mail: tbuehler@netscales.com
Message Posted:

In Reply to: belt weighers posted by Raj Sreenevasan on 05/01/00 at 1:28 AM:

The answer to your question is yes, it is possible. However, several factors determine whether or not you can achieve these accuracies.

1. Environmental,is it indoors or outside?, wind can greatly affect belt scales, especially if the material load on the belt is low.

2. Consistancy of material, in the case of aggregates (i.e. lime stone) raw materials before processing are in large chunks, while after processing the material is nicely crushed and uniform. Uniform materials greatly improve accuracy.

3. Calibration method, the initial calibration of a belt scale is performed using test weights. If possible, a material test should be used to determine
further adjustments to calibration.

4. The initial installation of of the device is also critical. Idlers and belt need to be aligned properly.

5. Proper size (capacity) of scale is crucial to accurate weighing. If the capacity selected for your application is too high,accuracy can suffer. Too low, and your scale can be overloaded.

I strongly suggest material calibration whenever it is possible, as test weights do not truly simulate the flow of material accross a conveyor belt.

I would also suggest that if these kinds of accuracies are required you should consider a dual idler configuration for your scale. This setup greatly improves accuracy.

You did not mention any details of your application such as type of material being weighed, idler spacing, conveyor speed, belt load, etc.

I hope I have been of some help. Feel free to ask more questions!!

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