Temperature measurement circuit composed of the K-type thermocouple

Published:2011/9/8 19:59:00 Author:Christina | Keyword: Temperature measurement circuit, K-type, thermocouple | From:SeekIC

The temperature measurement circuit composed of the K-type thermocouple is as shown in the figure. In the temperature range of -40-500°F, the thermoelectric potential of the K-type thermocouple and the temperature has a good linear relationship, the relationship can be expressed as UY=0.226TX-0.707. In the formula, the UY is the thermoelectric potential (mV), the Tx is the temperature (°F). Tx=(UY十0.707)/0.226=(1OlUY十71.4)/22.8°F, so we get the 1mV/°F output. In the circuit, the LTl025 produces the cold contact point compensation voltage of the thermocouple, A1 amplifies the thermocouple output for 101 times, the stable voltage of WD1 is adjusted to 71.4mV by RP1, and it adds to the reverse phase input port of the addition amplifier.



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