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TEMPERATURE MEASUREMENT

TEMPERATURE MEASUREMENT. MR. VISHAL VASISTHA ASSISTANT PROFESSOR (ME) DRONACHARYA COLLEGE, GURGAON. INTRODUCTION. It is defined as : measure of the “ quality of heat” correlates to molecular kinetic energy . THERMOCOUPLES.

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TEMPERATURE MEASUREMENT

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  1. TEMPERATURE MEASUREMENT MR. VISHAL VASISTHA ASSISTANT PROFESSOR (ME) DRONACHARYA COLLEGE, GURGAON

  2. INTRODUCTION It is defined as : • measure of the “quality of heat” • correlates to molecular kinetic energy.

  3. THERMOCOUPLES • Working on the principle of SEEBECK EFFECT - “The Seebeck effect is a phenomenon in which a temperature difference between two dissimilar electrical conductors or semiconductors produces a voltage difference (few mV per 10K)between the two substances.” • Measuring potential difference requires attaching leads and a voltmeter

  4. TYPICAL THERMOCOUPLE CONFIGURATION Voltmeter Metal A Metal A Metal B Solid Liquid Unknown temperature Reference temperature (slush bath)

  5. THERMOELECTRIC CIRCUIT Display unit Metal B Metal B EMF Current Metal A J-1 (Hot junction) J-2 (Cold junction)

  6. THERMOCOUPLES • Seebeck effect • If two wires of dissimilar metals are joined at both ends and one end is heated, current will flow. • If the circuit is broken, there will be an open circuit voltage across the wires. • Voltage is a function of temperature and metal types.

  7. THERMOCOUPLES • The relationship of potential difference with temperature -

  8. THERMOCOUPLE TYPES

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