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How does a controller fire to a pyrometric cone?

Cone-Fire mode fires at the speed and temperature that will bend the witness cone. The speed varies during the firing, with a faster speed near the beginning and a slower speed at the end. During the last 1-1/2 hours, the firing rate is 108 degrees F per hour. The firing temperature is listed in the 108 degree F column on the Orton pyrometric cone chart. If the voltage is low, elements are worn out, or for some other reason the kiln cannot maintain the programmed firing rate, the controller will adjust the shut-off temperature so that the cone still bends to maturity. As long as the kiln can maintain the programmed rate, it will fire a given program in exactly the same length of time for every firing.

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