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Experimental Method for Determination of Self-Heating at the Point of Measurement

  • D. SestanEmail author
  • D. Zvizdic
  • L. Grgec-Bermanec
TEMPMEKO 2016
  • 130 Downloads
Part of the following topical collections:
  1. TEMPMEKO 2016: Selected Papers of the 13th International Symposium on Temperature, Humidity, Moisture and Thermal Measurements in Industry and Science

Abstract

This paper presents a new experimental method and algorithm for the determination of self-heating of platinum resistance thermometer (PRT) when the temperature instability of medium of interest would prevent an accurate self-heating determination using standard methods. In temperature measurements performed by PRT, self-heating is one of the most common sources of error and arises from the increase in sensor temperature caused by the dissipation of electrical heat when measurement current is applied to the temperature sensing element. This increase depends mainly on the applied current and the thermal resistances between thermometer sensing element and the environment surrounding the thermometer. The method is used for determination of self-heating of a 100 \(\Omega \) industrial PRT which is intended for measurement of air temperature inside the saturation chamber of the primary dew/frost point generator at the Laboratory for Process Measurement (HMI/FSB-LPM). Self-heating is first determined for conditions present during the comparison calibration of the thermometer, using the calibration bath. The measurements were then repeated with thermometer being placed in an air stream inside the saturation chamber. The experiment covers the temperature range between \(-65{\,}^{{\circ }}\hbox {C}\) and \(10{\,}^{{\circ }}\hbox {C}\). Self-heating is determined for two different air velocities and two different vertical positions of PRT in relation to the chamber bottom.

Keywords

Platinum resistance thermometers Self-heating Uncertainty 

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Copyright information

© Springer Science+Business Media, LLC 2017

Authors and Affiliations

  1. 1.Croatian Metrology Institute/Faculty of Mechanical Engineering and Naval ArchitectureLaboratory for Process Measurement (HMI/FSB-LPM)ZagrebCroatia

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