Transcription of A Basic Guide to Thermocouple Measurements
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A Basic Guide to Thermocouple Measurements
Application Report SBAA274 September 2018. A Basic Guide to Thermocouple Measurements Joseph Wu ABSTRACT. Thermocouples are common temperature sensors used in a wide variety of commercial and industrial applications. While slightly less accurate than resistance temperature detectors (RTDs), thermocouples cover a wide temperature range, are self-powered, and have a fast response time. Their simple construction make them inexpensive and durable. Because of the small sensor voltage and low noise requirements, delta-sigma analog-to-digital converters (ADCs) are ideal data converters for measuring thermocouples. This application report gives an overview of thermocouples, discussing theory of operation, functionality, and methods in temperature measurement. Many circuits are presented showing Thermocouple connections to precision ADCs. Different topologies focus on biasing thermocouples for the ADC input and for burn-out Measurements .
Temperature ( qC) Thermocouple Voltage (mV)-400 -200 0 200 400 600 800 1000 1200 1400 1600 1800-20 0 20 40 60 80 Type J Type K Type T Type E Type S Thermocouple Overview www.ti.com 4 SBAA274–September 2018
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