Design of Digital K-Type Thermocouple Temperature Transmitter

Yao Li; Lei Zhang

doi:10.4028/www.scientific.net/AMM.433-435.217

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 433-435Design of Digital K-Type Thermocouple Temperature...

Design of Digital K-Type Thermocouple Temperature Transmitter

Abstract:

The paper introduces a method of digital K-type thermocouple temperature transmitter design, which uses MAX6675, a digital K-type thermocouple converter, MCU and TTL/485 conversion circuit. MCU calculates thermoelectric potential of thermocouple by the result of MAX6675 firstly, and then obtains the temperature by reference tables of K-type thermocouple and linear interpolation method, and result is serial output in digital mode. The method can eliminate interference of analog signal transmission, and improve measurement accuracy.