Control of Variability
Pyrometric cones are sensitive measuring devices and it is important to users they should remain consistent in the way that they react to heating. Cone manufacturers operate procedures to control variability (within batches and between batches) to ensure that cones of a given grade remain consistent in their properties over long periods. Whilst there are a number of national standards ISO have published ISO 1146:1988-02 regarding Pyrometric cones.
Even though cones from different manufacturers can have relatively similar numbering systems they are not necessarily identical in their characteristics. If a change is made to cones from one manufacturer to another than allowances for the differences can sometimes necessary.
Read more about this topic: Pyrometric Cone
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