Thermocouple to RS-232
In this circuit, the LT1025 cold-junction compensator provides the signal conditioning. The compensator’s voltage varies with the temperature of the reference junction in such a way that when summed with the thermocouple voltage, the combination behaves as if the reference junction were maintained at 0°C. (You should place the compensator as close as possible to the reference junction.) The compensator also linearizes the output of the thermocouple and is markedly more convenient than an ice bath.
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http://www.edn.com/archives/1995/110995/23di2.htm
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