Chapter 04B - RTD - RESITIVE TEMPERATURE RESITIVE...

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Unformatted text preview: RESITIVE TEMPERATURE RESITIVE TEMPERATURE 3 . RESITIVE TEMPERATURE . RESITIVE TEMPERATURE DETECTOR (RTD) DETECTOR (RTD) ¡ Resistivity of a metal has relation to temperature. i.e. when temperature increases, resistance increases. ¡ where: R : resistance ( ) aT 1 R R + ≅ R : resistance at 0 Kelvin a : constant temperature T : temperature ¡ The temperature sensor element is a thin wire coil (normally nickel or platinum) hich is located at the end of the tube Dr. Abdirahman CHAPTER 4 Page 32 of 111 which is located at the end of the tube. ¡ The range of RTD depends on the type of metal used where the range for latinum is 00 ° 50 ° and the range platinum is -100- 650 C and the range for nickel is -180 ° – 300 ° C. ickel type RTD is cheaper than ¡ Nickel type RTD is cheaper than platinum but it is having lesser linearity. ¡ RTD sensor requires a Wheatstone Bridge signal modifier to change the resistance to standard voltage. Dr. Abdirahman CHAPTER 4 Page 33 of 111 terminals Output Signal (4-20 mA) Connection head Protecting tube TD Sensor TD Sensor Resistance element Dr. Abdirahman CHAPTER 4 Page 34 of 111 RTD Sensor RTD Sensor Dr. Abdirahman CHAPTER 4 Page 35 of 111...
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This note was uploaded on 05/09/2010 for the course CHE 3022 taught by Professor Abdirahman during the Fall '07 term at National Central University.

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Chapter 04B - RTD - RESITIVE TEMPERATURE RESITIVE...

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