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How do you calibrate a pyrometer?

Here's a simple way to calibrate a pyrometer:

1) Place a self-supporting witness cone in a central area of your firing chamber where you can see the cone through a peephole.

2) Fire the kiln. During the last hour of firing, the rate of temperature rise should be 108°F (60°C).

3) When the witness cone bends so that the tip of the cone is even with the top of the self-supporting base, adjust the pyrometer to match the Orton cone chart. (Use the 108°F column in the chart.)

Note: The self-supporting cone is very slightly over-fired when the tip touches the shelf. The tip should be even with the top of the cone's tapered base.

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