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XTR101 Thermocouple Input Circuit

2014-11-08 11:08  
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XTR101 Thermocouple Input Circuit
The circuit shows the thermocouple input circuit withtwo temperature zones and diode cold junction compensation. This circuit uses J-type thermocouple as temperature sensor, semiconductor diode Das cold junction temperature compensation to form the relative 0oC of the measurement, to measure the temperature, T1 temperature range is from 0 to 1000oC. The temperature of T2 is equal to the temperature TD of semiconductor diode D. When the measured temperature changes in the range of 0to 1000oC, J-type thermocouple will have a 58mV change. When the ambient temperature is +25oC, the typical value would be 1.28mV. Corresponding 0oC transmission current is 4mA, corresponding 1000oC transmission current is 20mA.