(English) Calibration And Measurement Services Center Of Uznim: Development of High-Precision Calibration Capabilities and International Cooperation

 

     The Calibration and Measurement Services Center was established on 1 July 2019 as part of the development of calibration activities and the implementation of modern approaches to ensuring metrological traceability of measurement results. At the initial stage, the Center focused on consolidating technical and human resources to accelerate the introduction of calibration services in the fields of mass, volume, pressure and temperature.      Within a relatively short period, the Center established a stable technical and methodological foundation for the development of calibration services. As the national metrological infrastructure evolved, part of the routine calibration services was transferred to other specialized departments of UzNIM, including the calibration of weighing instruments and indicating thermometers. This allowed the Center to focus on more complex and high-precision areas of measurement associated with the use of reference standards and modern approaches to ensuring metrological traceability.      Today, the Center comprises four specialized laboratories: the Mass Laboratory, the Volume Laboratory, the Absolute and Gauge Pressure Laboratory, and the Contact Thermometry Laboratory.      The Mass Laboratory performs calibration of weights applied by national metrology institutes, secondary calibration and testing laboratories, as well as scientific organizations. Calibration activities are performed within the measurement range from 1 mg to 20 kg. To ensure high measurement accuracy, reference weights of classes E0, E1 and E2 are applied in accordance with OIML R 111-1 recommendations.      The Volume Laboratory specializes in the calibration of micropipettes and small-volume measuring instruments applied mainly in analytical, testing and pharmaceutical laboratories. Particular attention is given to microliter measurements requiring high stability and accuracy.      The Absolute and Gauge Pressure Laboratory includes two specialized sectors: the gas pressure sector and the liquid pressure sector. The technical capabilities of the laboratory ensure measurements of absolute pressure up to 7 MPa and gauge pressure within the interval from −0.095 MPa to 400 MPa. Calibration objects include high-precision pressure gauges, pressure sensors and pressure transmitters applied by national metrology institutes, secondary calibration and testing laboratories, as well as enterprises of the energy, oil and gas sectors and other industries.      The activities of the Contact Thermometry Laboratory are focused on the realization of the International Temperature Scale of 1990 (ITS-90). The laboratory realizes fixed temperature points ranging from the triple point of mercury to the freezing point of silver, including the melting point of gallium, the triple point of water, and the freezing points of indium, tin, zinc and aluminum. The laboratory performs calibration of Standard Platinum Resistance Thermometers (SPRTs) applied by national metrology institutes, research organizations, calibration and testing laboratories for high-precision temperature measurements. During calibration activities, the Center’s specialists apply not only international and regional normative documents, but also modern scientific publications issued by leading national metrology institutes. In the field of mass measurements, the laboratory applies OIML recommendations, while volume measurements are performed in accordance with ISO standards and DKD recommendations. In the field of pressure measurements, calibration methodologies are based on EURAMET and DKD recommendations, while thermometry activities follow recommendations of the Consultative Committee for Thermometry (CCT) of the International Committee for Weights and Measures (CIPM).      The Center participates in international and regional comparisons conducted within the framework of the CIPM MRA. Specialists of the Center participate in key and supplementary comparisons organized under APMP, COOMET, EURAMET and GULFMET.      In the field of mass measurements, the Center participates in supplementary comparisons AFRIMETS.M.M-S1, COOMET.M.M-S6, COOMET.M.M-S7 and COOMET.M.M-S8 aimed at confirming the equivalence of measurement capabilities and ensuring international comparability of measurement results. In several areas, the Center’s specialists participate not only as comparison participants, but also as pilot laboratories, coordinators and representatives of technical areas.      International cooperation in the field of comparisons includes interaction with national metrology institutes and designated institutes of Armenia, Azerbaijan, Belarus, Burkina Faso, China, Georgia, Jordan, Kazakhstan, Kyrgyzstan, Malaysia, Moldova, Mongolia, Russia, Slovakia, Tajikistan, Türkiye and Uganda.

 

 

 

 

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