Kiln sitters are special mechanisms that remove the power from the heating elements once the desired temperature has been reached inside the kiln. This helps the kiln not to over fire a glass fusing piece. It is a great helper to have with your kiln.
You place a pyrometric cone into the sitter. This cone is rated for the specific heat you need the kiln to attain before it needs the heat turned off. It is also designed to bend when this heat setting is reached, which triggers the sitter to turn off the heat by moving the rod that sits on the cone. This causes a lever on the sitter to drop down and turns off the kiln.
The sitter is not a control mechanism for the temperature. This is done by other parts of the kiln. Its only function is to remove the power that heats the elements in the kiln. It is also important to know that a sitter is not completely dependable. It can malfunction. For this reason, a kiln should not be left unattended, while it is in use. However, some sitters come with a limit timer that acts as a backup in the event of a malfunction. Know what time your kiln should be ready to be turned off though, in case you have to do it yourself manually.
You never want your kiln to fail turning off at the right time. This could lead to a disastrous meltdown. Your glass fusing projects will melt all over the shelf and could even stick to it. You may need even to throw the shelf away, if this happens. This is why you need to be alert when you do glass fusing.
Consider a kiln sitter as a help aid for your glass fusing kiln. However, never totally depend on just the fact you have set it. You still need to watch over your kiln during use.
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