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Could the Kiln Sitter be used as an over-temperature safety shutoff for glass firings?

Yes. The Kiln Sitter uses a pyrometric cone to sense when to shut off the kiln. Use a cone that is rated to a higher temperature than the glass yet lower than the kiln's maximum temperature. If the kiln ever begins to overfire, the cone will bend, and the kiln will shut off.

Suppose you fire glass to 1350F. You could load an 014 (rated to 1485F) cone in the Kiln Sitter. It ordinarily bends at 1485F, so the Kiln Sitter would not shut off and interfere with the glass firing unless there is an overfire. The only way for cone 014 to deform in this case is if the temperature were to approach 1375F at a heating rate of only 1 degree F per minute.

You can also do a long annealing segment after the glass fuses and still not bend the cone. Slow down the cooling rate in the annealing temperature range, which is typically 900F - 700F. The cone will not receive enough heat work in the low temperature range to bend and shut off the kiln.

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