Calibration of Thermocouples

1. Calibration ofThermocouples

2. Calibration of Thermocouple Mr. Jeerawong Kwangsukstit 503-00616-21 Mr. Chayamin Sinpaween 503-00811-21 Ms. Piyakul Laocharoen 503-03218-21 Mr. Nattaphon Chanrat 503-01434-21 Mr. Sarayu Sae-chua 503-05198-21

3. OUTLINE Introduction Objective Experiment Result Discussion Conclusion

4. Introduction

5. INTRODUCTION • Temperature is important properties in engineering. • When we design product temperature is to be concerned. • Thermocouples are one of many temperature sensors. • Thermocouples can sensor temperature in wide range

6. Objective

7. OBJECTIVE • To calibrate thermocouples type J K T.

8. Principle of Calibration

10. Input from calibrator (Temperature) Thermocouple Transducer Output (Voltage)

11. DATA REDUCTION DIAGRAM emf = V (∆T, M ;Tref ) emf = voltage (millivolt) Tmea = Temperature measurement(˚C) Tref = Temperature reference (˚C) M = Type of Thermocouples (J K T) ∆T = Tmea - Tref (˚C)

12. emf = V( ∆T, M ; Tref ) Tref{ Thermometer }˚C emf{ HP 973A} mV M {Type Label : J K T} ∆T ( Tmea , Tref ) = Tmea- Tref Tref{ Thermometer }˚C Tmea{ Hakke HK-12206-55 }˚C DATA REDUCTION DIAGRAM

13. Experiment

14. Experiment Approach Equipments • Thermocouples type J K T • with an extension wire • Temperature-Control Bath • Multimeter • Ice • water • a bucket • Thermometer Hg type

15. METHODOLOGY • Put ice and water into a bucket in purpose for equilibrium system which is temperature at 0⁰C. • Open the Temperature-Control bath and set the initial temperature for J K T type respectively. • Set Multi-meter to measure voltage (mV). • Set J type thermocouple with extension wire then do the same with the others. • Collect data from multimeter. • Increase temperature 3⁰C for every measurement. • Plot chart between Temperature and Voltage. • 8. Find the calibration curve.

16. Result

21. Regression Method

22. y = 0.053x - 0.070 R² = 0.999

25. Total Uncertainty Bias Precision Regression method

26. Bias Measurement Equipment • Calibrator • Multimeter • Thermometer Hg type Bias = 0.02๐c

28. y = 0.053x - 0.070 R² = 0.999

33. Discussion

34. Discussion • Calibration curve of thermocouples type J K T are about the same to reference calibration curve.

35. http://www.omega.com/temperature/Z/zsection.asp

37. Find and Compare the specific values of the three types of Thermo Couples • Including • Linearity • -Resolution • -Sensitivity • -R-Square

38. Celsius Degree/mV mV/celcius Degree Celsius Degree/mV mV/celcius Degree Celsius Degree/mV mV/celcius Degree

39. mV/ °C mV/ °C mV/ °C

44. We can also do the same experiment by MS/ST. • Precisionfrom MS/ST is more than SS/ST but less than bias.

48. Conclusion • -get calibration curve • -can use it to measure Temperature • -Know the specific values of each types • -can choose themo- couple to work

49. References http://www.omega.com/temperature/Z/zsection.asp http://www.automationmedia.com/AutomationControls_KnowledgeBaseDetail.asp?ID=%20127 http://www.omega.com/techref/themointro.html

50. BACK UP Formulas 2