TFL08 Temperature Instuments

TFL08 Temperature Instuments - Temperature and Radiation...

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1 Temperature and Radiation Sensors 2 Unit Objectives • Describe the various methods available to measure temperature • Present the physics associated with the operation of these devices • Examine the issues associated with using common temperature measuring systems
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2 3 Temperature Sensor (Mechanical) Temperature Sensor (Mechanical) • Thermometer (Liquid in Glass) – Mercury (-39 o C to 357 o C) – Alcohol (-117 o C to 79 o C) • Pressure Thermometer • Bimetallic Strip 4 Temperature Sensor (Pneumatics) Temperature Sensor (Pneumatics) • Bimetallic Strip • Expansion Tube Material A (Small ) Material B (Large ) Brass Tube Low Value Core
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3 5 Temperature Transducer (Electric) Temperature Transducer (Electric) • Bimetallic Strip • Thermo-Resistive (RTD) •Th e rm i s to r • Thermocouple • Semiconductor – Diode – IC Chip 6 Resistance Temperature Detectors • The resistance of these devices change with temperature • The function that relates temperature to resistance is a polynomial (normally a quadratic), but linear over small ranges • Operating Ranges – Copper: -200 o C to 250 o
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4 7 Thermo-Resistor/Thermistor Thermo-resistive Element V o 5 - 12 V DC R g R v R 2 R 1 R m ( V i ) 8 RTD Analysis I 1 ) ( 1 1 ) ( 2 1 1 2 1 2 1 R R R R R R R R R R R R V R R R R V v g g v m g v i v g o For a Wheatstone bridge the output voltage is a function of the resistances and the input voltage. 1 ) ( 2 1 2 1 R R R R V R R R R V g v i v g o Now let R m →∞
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5 9 RTD Analysis II Now let R 1 = R 2 ) ( 2 ) ( v
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TFL08 Temperature Instuments - Temperature and Radiation...

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