Calibration of an unloaded laboratory oven and the associated uncertainty of measurements

Authors

  • Oqab AlOtaibi 1 National Measurement and Calibration Center (NMCC), Saudi Standards, Metrology and Quality Organization (SASO), Riyadh, Kingdom of Saudi Arabia
  • Rakan AlNefaie 1 National Measurement and Calibration Center (NMCC), Saudi Standards, Metrology and Quality Organization (SASO), Riyadh, Kingdom of Saudi Arabia
  • Ahmed AlMatrawi
  • Ismail AlFaleh 1 National Measurement and Calibration Center (NMCC), Saudi Standards, Metrology and Quality Organization (SASO), Riyadh, Kingdom of Saudi Arabia
  • Adel Shehata SASO/NMCC

DOI:

https://doi.org/10.21014/actaimeko.v14i2.1918

Keywords:

oven, calibration, Pt100, inhomogeneity, instability, uncertainty

Abstract

The aim of this research was to describe the calibration of an unloaded laboratory oven used for drying textiles samples from respiration at (37 ± 2) °C and the detailed associated uncertainty of measurements. The calibration was performed at three temperature points (35 °C, 37 °C and 40 °C) in accordance with the DKD-R 5-7:2018 guidelines. The entire calibration system including the nine calibrated Pt100 temperature probes and the multimeter that reads temperature in °C was interfaced with a PC running a LabVIEW program for data acquisition and analysis. The temperature drift, inhomogeneity, instability and the calibration uncertainty were assessed. A small temperature drift of 0.3 °C over 48 hours at 40 °C was found. The temperature inhomogeneity expressed as the maximum absolute difference between the reference location and the other locations, Max │Tref - Ti│ was found well below the acceptable accuracy of ± 2 °C. The temporal instability expressed as the maximum difference between the average and the temperature of each Pt100, Max │T̅ - Ti│ was also smaller than the acceptance limit, ± 2 °C of the textile test. The expanded uncertainty did not exceed ± 1.24 °C indicating a good oven calibration. This investigation revealed that the calibrated oven maintains good temperature drift, homogeneity and stability making it suitable for reliable textile testing.

Author Biographies

Oqab AlOtaibi , 1 National Measurement and Calibration Center (NMCC), Saudi Standards, Metrology and Quality Organization (SASO), Riyadh, Kingdom of Saudi Arabia

Department of physics

Rakan AlNefaie , 1 National Measurement and Calibration Center (NMCC), Saudi Standards, Metrology and Quality Organization (SASO), Riyadh, Kingdom of Saudi Arabia

Physics department

Ahmed AlMatrawi

Physics department

Ismail AlFaleh, 1 National Measurement and Calibration Center (NMCC), Saudi Standards, Metrology and Quality Organization (SASO), Riyadh, Kingdom of Saudi Arabia

Physics departmnet

Downloads

Published

2025-06-10

Issue

Vol. 14 No. 2 (2025)

Section

Research Papers

License

Copyright (c) 2025 Oqab AlOtaibi , Rakan AlNefaie , Ahmed AlMatrawi , Ismail AlFaleh, Adel Shehata

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under the CC BY 4.0, Creative Commons Attribution 4.0 International License.

Users are free to

  • share, i.e. copy and redistribute the material in any medium or format for any purpose, even commercially;
  • adapt, i.e. remix, transform, and build upon the material for any purpose, even commercially.

At the same time, the user must give appropriate credit, provide a link to the license, and indicate if changes were made.
Additional information about the license can be found at: https://creativecommons.org/licenses/by/4.0/.

Authors are

  • able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
  • permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).