Furnaces temperature control regimes

The optimum and by far the most precise, temperature control system in a multibumer furnace is on-off firing (with several options). This requires that burner ignition is prompt and extinction is fast or that transition from a high-fo low-fire regime is straightforward. Flame performance can be optimized for a well-calibrafed burner flow-rate (100% power) and this should accurately match the furnace production rafe. 

Figure 2.39. A sketch of a type of differential thermal analysis head is shown in (a). The two small crucibles (internal diameter 4 6 mm) contain the sample (S) and the reference (R, inert material). The junctions of two thermocouples (Ts, 7r) are inserted in the crucibles. They give the temperature of the sample and the AT between sample and reference. The DTA head is inserted inside a furnace (F), the heating and cooling regime of which may be conveniently controlled.

Additionally, automated furnace operation allows close control of the working regime and temperature and minimises excessive energy consumption. 

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