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SEGAR CONES - An alternative method to read temperatures in Furnace

In the case of the permanent pyrometer, Segar cones are used as temporary means for determining approximate temperatures. The cones are pyramidal in shape, made from mixtures of kaolin, lime, feldspar, magnesia, quartz and boric acid , each cone melting at a predetermined temperature arranged in steps from 600 to 2000*C. When a furnace temperature is required, several of these cones, within the required temperature range, are put in the furnace and observed. The temperature is judged from which the cone collapses, and which remain unaffected by the heat of the furnace. For example, to verify an approximate temperature of  825*C, cones having melting points of 700, 750, 800 and 850*C are put in the furnace and the temperature is ascertained from their condition after sufficient time has elapsed for them to be effected.

Segar Cones


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