eesti teaduste
akadeemia kirjastus
SINCE 1952
Proceeding cover
of the estonian academy of sciences
ISSN 1736-7530 (Electronic)
ISSN 1736-6046 (Print)
Impact Factor (2021): 1.024
Traceability of temperature measurements in Estonia; pp. 116–121
PDF | doi: 10.3176/proc.2013.2.05

Riho Vendt, Viktor Vabson, Toomas Kübarsepp, Mart Noorma

This paper presents an overview of the establishment of the national measurement standard for temperature at METROSERT – the national metrology institute in Estonia. The temperature scale and traceability arrangements are realized in the temperature range from – 40 °C to + 300 °C by means of a group of calibrated standard platinum resistance thermometers and water triple point cells. The linkage of the realized water triple point temperature to the international key comparison value with the expanded uncertainty of 187 μK (coverage factor k = 2) is demonstrated. The established laboratory is capable of providing calibration services to customers by comparison calibration with the expanded uncertainty (k = 2) values of 5 mK in the range from – 40 °C to + 200 °C and 12 mK in the range from + 200 °C to + 300 °C.


  1. Bureau International des Poids et Mesures. The Inter­national System of Units (SI). 8. ed., BIPM, Sèvres, 2006.

  2. Bureau International des Poids et Mesures. National and International Needs Relating to Metrology: Inter­national Collaborations and the Role of the BIPM. BIPM, Sèvres, 1998.

  3. Metrosert Ltd. Survey of the Needs for Calibration Services. Results and Analysis. Metrosert, Tallinn, 2002 (in Estonian).

  4. Comité International des Poids et Mesures. Mutual Recognition of National Measurement Standards and of Calibration Certificates Issued by National Metrology Institutes. CIPM, Paris, 1999.

  5. Vendt, R., Kuusik, M., and Kübarsepp, T. Basis for traceable temperature measurements in Estonia. In TEMPMEKO 2004 – 9th International Symposium on Temperature and Thermal Measurements in Industry and Science, Vol. 2 (Zvizdić, D., Bermanec, L. G., and Stašić, T., eds). Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Zagreb, 2005, 941–944.

  6. Preston-Thomas, H., Bloembergen, P., and Quinn, T. J. Supplementary Information for the International Temperature Scale of 1990. BIPM, Sèvres, 1990.

  7. Renaot, E., Elgourdou, M., and Bonnier, G. Interlaboratory comparison of realizations of the triple point of water. Metrologia, 2000, 37, 693–699.

  8. Renaot, E. EUROMET Project No. 549. Comparison of Realization of the Triple-Point of Water. Final Report. BNM/INM–CNAM, Paris, 2004.

  9. Renaot, E. EUROMET Project No. 714. Comparison of Realization of the Triple Point of Water. Final Report. LNE-INM/CNAM, Paris, 2006.

10. Comité International des Poids et Mesures. Procès-Verbaux des Séances du Comité International des Poids et Mesures. BIPM, Sévres, 2005.

11. Renaot, E., Valin, M., and Elgourdou, M. Analysis of the comparison of TPW realizations in Europe in light of CCT Recommendation 2 (CI-2005). Int. J. Thermo­phys., 2008, 29, 791–798.

12. Vendt, R., Vabson, V., Kübarsepp, T., and Noorma, M. Traceability of the water triple point realization in Estonia. In Proceedings of the 1. Regional Metrology Organizations Symposium – RMO 2008; 20. Inter­national Metrology Symposium (Ilić, D., Boršić, M., and Jurčević, M., eds). IMEKO & Metrology Consult­ing, Zagreb, 2008, 196–197.

13. Stock, M., Solve, S., del Campo, D., Chimenti, V., Mèndez-Lango, E., Liedberg, H., et al. Final Report on CCT-K7: Key comparison of water triple point cells. Metrologia, 2006, 43, 03001.

14. White, D. R., Ballico, M., Chimenti, V., Duris, S., Filipe, E., Ivanova, A., et al. CCT/08-19 Uncertainties in the Realiza­tion of the SPRT Subranges of the ITS-90. CCT-WG3, 2009.

15. Vendt, R., Juurma, M., Jaanson, P., Vabson, V., Kübar­sepp, T., and Noorma, M. Effects of environmental conditions on the performance of thermal imagers. Int. J. Thermophys., 2010, 32, 248–257.

16. BIPM, IEC, IFCC, ISO, IUPAC, IUPAP, et al. Guide to the Expression of Uncertainty in Measurement, 2. ed. Inter­national Organisation for Standardisation, Geneva, 1995.

Back to Issue