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A separate column oven may also support temperature programming, a sometimes‐useful technique that gradually increases the temperature of a column during analysis. When temperature programming is employed, the analyzer needs a reproducible cooling system to rapidly lower the column temperature to its original starting point.

Temperature programming is common in laboratory gas chromatographs and allows them to separate a wide range of components, but it's rare in process gas chromatograph due to cost and analysis time issues. This may change with the introduction of less complex methods of heating and cooling, as discussed in Chapter 11.