TEMPERATURE - CHECKING KILNS
A pyrometer is an electrical instrument for checking the temperatures in kilns. It registers the rise of the heat during firing. It is connected to a porcelain sheath, which is passed through the spy hole in the wall of the kiln to protrude for about 2 cm inside and monitors the heat which is shown on the pyrometer.
Cones are used as another checking method. They are placed in different parts of the kiln in small lumps of clay to keep them upright and in line with the spy-hole so the heat process can be observed. When the kiln is opened, if one has bent too much, it means that the heat is too high in that part of the kiln, and if not enough, too low. Read more about: Cone – Witness / Kiln – Heat controller / Pyrometer