The application circuit of the N-type thermocouple

Published:2011/8/23 22:36:00 Author: | Keyword: application circuit, N-type, thermocouple | From:SeekIC

The thermocouple has the strong durability, the good stability and low price. So it can be used in the industry applications. Figure 3-1 is the application circuit of the N-type thermocouple. It uses the compensation circuit and the digital controlled linear circuit of the chopper-stabilized amplifier △ＵBE cold contact point. So there is no need to adjust the circuit, in the 4-373K thermodynamics temperature range, the output full-scale error of this circuit is +/-3%. When the circuit is connected with the thermocouple sensor, the circuit will changes into the accurate thermodynamics temperature scale thermometer. In this circuit, the X9C103 is the digital potentiometer, the HC4053(1)-HC4053(3) are the analog switches, A1 uses the LTC1049 operational amplifier, A2 and A3 use the LTCl541 operational amplifier.



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