In extractive gas analysis the sample gas must be conditioned before it enters the measuring cell of the analyser. One of these conditioning stages is moisture precipitating in so-called sample gas coolers. Applications where the moisture content of the sample gas is particularly high or the moisture content fluctuates greatly, installing a precooler in the supply line to the actual sample gas cooler will increase reliability. This precooler consists of an appropriately dimensioned heat exchanger, which only uses the temperature gradient between the sample gas and ambient air, and a condensate pump. The TS precooler comes inside a protection cage, ready to install.