Transcription of Application Note 28 Thermocouple Measurement
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Application Note 28 Thermocouple Measurement
Application Note 28AN28-1an28fFebruary 1988 Thermocouple MeasurementJim WilliamsIntroductionIn 1822, Thomas Seebeck, an Estonian physician, acci-dentally joined semicircular pieces of bismuth and copper (Figure 1) while studying thermal effects on galvanic ar-rangements. A nearby compass indicated a magnetic dis-turbance. Seebeck experimented repeatedly with different metal combinations at various temperatures, noting relative magnetic fi eld strengths. Curiously, he did not believe that electric current was fl owing, and preferred to describe the effect as thermo-magnetism. He published his results in a paper, Magnetische Polarisation der Metalle und Erze durch Temperatur-Differenz (see references).Subsequent investigation has shown the Seebeck Effect to be fundamentally electrical in nature, repeatable, and quite useful.
COMPATIBLE WITH TYPE E, J, K, R, S AND T THERMOCOUPLES AUXILIARY 10mV/°C OUTPUT VO 10mV/°C GND 10mV/°C TEMPERATURE SENSOR 10mV/°C OUTPUT Figure 8. LT1025 Thermocouple Cold Junction Compensator – + LT1001 C2 0.01 R7 6.8k R1 10k 1% R3 1M 1% V+ C1 0.01μF R6 8.4k VOUT 10mV/°C AN28 F09 R4 10k R5 2k FULL-SCALE ADJUST V– …
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