The pyrometric ring is a tool used in ceramics to measure the maximum temperature reached during the firing process in a kiln. Unlike pyrometric cones, which deform at a specific temperature, the pyrometric ring does not undergo visible changes, but undergoes alterations in its size or weight due to the contraction or expansion of the ceramic material when exposed to high temperatures. These changes are precisely measured before and after firing, which makes it possible to accurately determine the maximum temperature reached in the kiln.
To use the pyrometric ring, the appropriate ring is first selected according to the firing temperature range, since each ring corresponds to a specific melting point. Then, its size or initial weight is accurately measured before it is placed inside the kiln. During firing, the ring will undergo expansion or contraction due to the heat. After firing, its size or weight is measured again and the difference is compared with the initial measurement using a reference table, which will allow you to determine the maximum temperature reached in the kiln.
Interesting Fact
Pyrometric rings are particularly useful in industrial kilns or when using automatic firing equipment, as they provide an accurate measure of the actual temperature reached without relying on visual deformation.
Helpful Tip
Always measure pyrometric rings after firing with a calibrator to obtain accurate readings. Keep them in a controlled environment to prevent external factors, such as humidity, from affecting your measurements before firing.
