Transcription of Temperature Sensor Theory - Smart Sensors
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Temperature Sensor Theory - Smart Sensors
4 2003 Smart Sensors , Sensor TheorySeebeck EffectSeebeck circuit showing the positive (kp) and negative (kn) of a ChromelAlumel thermocouple. If the temperatures (T1 and T2) are different at the twojunctions a current will flow in the was responsible for developing the most rugged andsimplistic yet cost effective way of measuring Temperature over abroad range. Copper Constantan, Chromel Alumel, IronConstantan and Chromel Constantan, the standard thermo-couple calibrations that are in use today, were derived from thisresearch. They work the same way the scientist s Theory said theywould work. When you apply heat to T1 and T2 is at a differenttemperature the two dissimilar metals will produce a EMF. TheEMF is different for different metals and unfortunately it is notlinear, but it is accurate enough to handle most process applica-tions. Accuracy improvements have been made primarily bycloser control of the chemical composition; today thermocoupleshave accuracy as low as 1/2 degree Fahrenheit.
4 © 2003 Smart Sensors, Inc. Temperature Sensor Theory Seebeck Effect Seebeck circuit showing the positive (kp) and negative (kn) of a Chromel Alumel thermocouple. If the temperatures (T1 and T2) are different at the two
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