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TEMPERATURE MEASUREMENT  Galileo (1592) Colored alcohol  Gabriel Fahrenheit (1700) Ice water (0 o ) - Blood temperature (96 o )  Anders Celcius (1742)

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Presentasi berjudul: "TEMPERATURE MEASUREMENT  Galileo (1592) Colored alcohol  Gabriel Fahrenheit (1700) Ice water (0 o ) - Blood temperature (96 o )  Anders Celcius (1742)"— Transcript presentasi:

1 TEMPERATURE MEASUREMENT  Galileo (1592) Colored alcohol  Gabriel Fahrenheit (1700) Ice water (0 o ) - Blood temperature (96 o )  Anders Celcius (1742) Melting point of ice (0 o ) Boiling point of water (100 o )  William Thomson, Lord Kelvin (1800) K = o C (Absolute temperature)  W.J.M. Rankine o R = o F

2 INTERNATIONAL PRACTICAL TEMPERATURE SCALE IPTS-68 EQUILIBRIUM POINTK OCOC Triple Point of Hydrogen Liquid/Vapor Phase of Hydrogen Boiling Point of Hydrogen Boiling Point of Neon Triple Point of Qxygen Boiling Point of Neon Triple Point of Water Boiling Point of Water Freezing Point of Zinc Freezing Point of Silver Freezing Point of Gold

3 TEMPERATURE SENSORS  THERMOCOUPLE Thomas Seebeck  RESISTANCE TEMPERATURE DETECTOR Humphry Davy, William Siemens  THERMISTOR Steinhart - Hart  IC TEMPERATURE TRANSDUCER LM335, LM 34, AD592

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5 THERMOCOUPLE EFFECT SEEBECK – THERMOELECTRIC CIRCUIT THOMAS SEEBECK (1821) Dissimilar metals

6 e AB = Seebeck voltage  = Seebeck coefficient

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10 TYPEMETAL  [  V/ o C] RANGE [ O C] BPlatinum 6 % Rhodium – Platinum 30 % Rhodium 60 to 1820 ENickel – Constantan to 1000 JIron – Constntan to 760 KNickel 10 % Cr – Nickel to 1372 N (AWG 14)Nicrosil – Nisil390 to 1300 N (AWG 28)Nicrosil – Nisil to 400 RPlatinum 13 % Rhodium – Platinum to 1768 SPlatinum 10% Rhodium – Platinum to 1768 TCopper - Constantan to 400 W-ReTungsten 5 % Rhodium – Tungsten 26 % Rhodium to 2320

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12 Temperature Conversion Equation : NBS POLYNOMIAL COEFFICIENTS NBS = National Bureau of Standard

13 Contoh Soal No. 1.1 Sebuah termokopel tipe J yang digunakan untuk mengukur temperatur suatu ruang pembakaran menghasilkan tegangan output sebesar 5,867 mV. Berapa tegangan outputnya bila diukur dengan termokopel tipe K ? Termokopel Tipe JTermokopel Tipe K Polynomial Coefficients oCoCmV oCoC aoao - 0, , ,539 a1a , , ,939 a2a ,541204, ,338 a3a ,81305, ,737 a4a , ,137 a5a , ,537

14 Jawab : Termokopel Tipe J Polynomial Coefficients aoao - 0, a1a ,145 a2a ,54 a3a ,8 a4a a5a

15 Termokopel Tipe K oCoCmV oCoC 1004, , , , , , , , , , , ,537

16 PENGUKURAN TEMPERATUR MENGGUNAKAN VOLTMETER :

17 EQUIVALENT CIRCUITS : Tabel

18 Contoh Soal No. 1.2 Suatu temperatur diukur dengan menggunakan sebuah termokopel tipe J dan sebuah DVM (Digital Volt Meter). Temperatur ruangan pada saat pengukuran adalah 28 o C dan DVM menunjukkan angka 10,933 mV. Tentukan temperatur tersebut. Jawab : Dari tabel diperoleh :

19 External Reference

20 IRON-CONSTANTAN THERMOCOUPLE

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22 REMOVING JUNCTIONS FROM DVM TERMINALS Isothermal Block = electrical insulator + good heat conductor

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24 LAW OF INTERMEDIATE METALS A = Cu B = Fe C = C

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