Transcription of A Basic Guide to Thermocouple Measurements - TI.com
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A Basic Guide to Thermocouple Measurements - TI.com
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.
Direct polynomials construct the equations to calculate the thermoelectric voltage from a known temperature. These equations have a form shown in Equation 1. where • E is in microVolts and t90 is in degrees Celsius (1) Table 2 summarizes the polynomial orders and the respective temperature ranges for the types of thermocouples.
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