17 - MEEN260 Experimentation Temperature,PressureSensors RezaLangari TexasA&MUniversity [email protected]*,TAMUMEEN,Copyright2008 RTDandThermistors

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1 MEEN 260 Introduction to Engineering Experimentation Temperature, Pressure Sensors Reza Langari* Department of Mechanical Engineering Texas A&M University [email protected] *Incorporates a number of slides from Brian Rasmussen, TAMU MEEN, Copyright 2008. RTD and Thermistors Resistance Temperature Detector (RTD) Resistance element made of metals Nickel, copper, platinum,… Resistance as Temperature Thermistors Resistive element made of semiconductors Resistance as Temperature
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2 RTD and Thermistors Both types of devices calibrated for two extremes, and assumed linear in between () min max min max min min R R T T T T R T R + = max min min min max min RR RT R T T TT ⎛⎞ =+ ⎜⎟ ⎝⎠ Wheatstone Bridge used to convert resistance changes to voltage changes Thermocouple Seebeck Effect 1821 TJ Seebeck discovered that an emf exists across a junction of two dissimilar metals Simple device, with a few pitfalls Low voltage V 0 + - metal #2 metal #1 T V α = 0 Type “T” thermocouple (copper
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This note was uploaded on 12/26/2010 for the course MEEN 260 taught by Professor Langari during the Fall '08 term at Texas A&M.

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17 - MEEN260 Experimentation Temperature,PressureSensors RezaLangari TexasA&MUniversity [email protected]*,TAMUMEEN,Copyright2008 RTDandThermistors

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