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LOAD APPLICATION IMPERFECTION SENSITIVITY

Rev. D
               

The load cell user needs to take into account, the sensitivity of the load cell to any application condition, which would apply the load to the load cell in any imperfect way.

Unless the user knows that the load cell they have chosen is immune to imperfections in load application, the errors that could result must be taken into account.

Load imperfections, which can affect accuracy, include loading out of plane, lateral loads, and moment loads.  The load cell supplier should be made cognizant of these factors and the user should require that the supplier specify the load cell accuracy under those conditions.

Total Accuracy Transducer Corp. load cells generally have an exceptionally high immunity to imperfections in loading by the user and for an application staying within the specified loading conditions, the errors from typical load imperfections are included in the total accuracy specification.  Even with TAT load cells, however, load misalignment immunity is not universal.  Some designs are better than others.

With TAT or any vendor, in any case, if large angular or linear load misalignments are likely, they should be discussed with the load cell supplier and the effects at the large misalignments included in the error budget.

Most types of load cells require a fraction of a degree in load angular misalignment, some TAT load cells can, however, produce accuracy's of better than 0.1% with up to a 3 degree misalignment (some other technology load cells require 0.05 degrees alignment of the load.)

Most TAT load cells will also be accurate to less than 0.1% with more than a 5% cross-axis load.

With TAT load cells, a linear misalignment variation of +/-0.05 inches in the plane perpendicular to the load cell sensing axis will generally produce less than a 0.1% error.

TAT load cells also have a very high rejection of moment loads applied to the load cell.

These types of imperfect loading are all important to keep in mind in evaluating, selecting, and using load cells.


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