Abstract
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.
Highlights
This paper presents an overview of the establishment of the national measurement standard for temperature at METROSERT – the national metrology institute in Estonia
As the temperature scale is imported to METROSERT by calibration of the standard platinum resistance thermometers (SPRTs) at other laboratories, the resistance value at the triple point of water (TPW) is checked before the SPRTs are shipped for calibration and after the SPRTs have returned from calibration
The international temperature scale International Temperature Scale of 1990 (ITS-90) has been established on the secondary level at the national standard laboratory for temperature in Estonia, METROSERT, in the temperature range from –40 °C to +300 °C
Summary
Social advantages and economic competitiveness in modern society are supported by the effective national measurement system which is a generally recognized instrument in providing reliable measurement results traceable to the units of SI [1]. Most of the European countries have developed their national measurement systems with the history dating back to more than a hundred years. New independent countries with evolving economy and needs for elaboration of the metrology infrastructure are still emerging. This is the case for Estonia, where the development of the new national measurement system was initiated only in the early 1990s. The establishment of a new national measurement standard is a long-aimed process that must be supported by good planning for optimal use of resources. The development of the national standard for temperature in Estonia was
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