PTCR rings are made by Ferro in Saint Dizier, France from ceramic materials that shrink over a fairly wide temperature range. They are measured once they have been exposed to the firing process and their dimension is used to determine the peak temperature they were exposed to.
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For some products, such as porcelain and lead-free glazes, it can be advantageous to fire within a two-cone range. The three-cone system can be used to determine temperature uniformity and to check the performance of an electronic controlle