Simple thermocouple measurement solution circuit diagram (accuracy less than 1°C)

　　describe

This thermocouple measurement verification design provides a very simple and accurate way to implement thermocouple measurements. This design outlines the anti-aliasing filters and bias resistors necessary to provide sensor diagnostics. This example also provides a novel way to accomplish cold junction compensation of the system using the onboard temperature sensor on the ADS1118. For thermocouple linearization, this design also provides a very simple linear algorithm that can be implemented on most microcontrollers.

　　characteristic

Measuring K-Type Thermocouple Temperature

Accuracy <1 °C

High accuracy/repeatability 0.2°C

Includes cold junction compensation

Contains software algorithms

Using ADS1118 16-bit ADC (with PGA)

　　Schematic/Block Diagram