Retrofit systems

It is assumed that in new weighing installations that the structures involved are designed to be more than adequate for their purpose. However, if load cells are retrofitted to existing structures, then care must be taken to ensure that system integrity is maintained. Although most loading assemblies are designed to prevent excessive vessel movement, they must never be used as part of a structure's overall strength. Fitting load cells to existing structures typically involves cutting into the support legs or unbolting the structure from the ground or similar, in order to fit the load cells. In this situation, additional cross braces or gussets will almost certainly be required to provide sufficient strength. Unbolted legs can easily splay and buckle under load if not suitably braced.

Temperature considerations

The effects of temperature on load cells and weighing systems can be a major source of error, resulting not only in poor weighing but also causing major damage. Huge forces can be generated by expansion and contraction if adequate clearances are not allowed for. One topic often ignored when fitting load cells relates to the possible relative expansion and contraction of the load receiving element and the support structure or ground works. When fitted, the loading assemblies must allow for movement which occurs over the whole of the anticipated operating temperature, taking into account the maximum possible deviations which may occur between extreme winter and summer conditions.