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.
The dissimilar metals are joined at a temperature sensing junction (TTC) to create a thermocouple. The voltage is measured at a reference temperature ... temperature gradient across the circuit. Each connection from wire terminal, to solder, to copper trace, to IC pin, to bond wire, to chip contact creates a new junction. However, if the signal ...
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