Comparison of liquid samples of density
Domostroyev A. Nabieva E. Moldaganapov U. Tabullo O. Chubara A.
JanurayIOP Publishing Ltd
Metrologia
2022#59Issue 1A
The results are presented of the supplementary comparison COOMET.M.D-S1 (COOMET 555/AZ/12) that covered the measurements of density of four reference liquids (tridecane, distilled water, high-viscosity oil, and tetrachloroethylene) at 20 °C and 101325 Pa. laboratories of five national metrology institutes (NMIs) took part in the comparison. participating laboratories used the equipment approved in the participating countries as the state measurement standards of density. Measurements were carried out near 20 °C and at atmospheric pressure by two methods: method of hydrostatic weighting of reference measures of density and by using laboratory density meters DMA5000, manufactured by Anton Paar GmbH, Austria in the time interval from April 2, 2015 to August 28, 2017. Uncertainties of the measurement results obtained by the pilot laboratory were confirmed by the results of the CIPM key comparison ÑÑÌ.D-K2 [1] with the D.I. Mendeleyev Institute for Metrology as a participant. The components for a possible drift or inhomogeneity of the liquid are investigated for the final evaluation of the data. For this purpose, results of stability and homogeneity measurements of the pilot laboratory are used. The participants did not include in their uncertainty budget a possible drift of the liquids density since no significant drift could be detected, and the influence of the drift and its uncertainty are negligible. For this supplementary comparison, estimates of the density values of reference liquids obtained by the reference laboratory before sending samples to the participants (pilot laboratory, VNIIM, participant of the CIPM key comparison CCM.D-K2 [1]) were established as reference values. With one exception, the results of water density measurements showed good agreement between the participants. For the highest and lowest density liquids, tetrachlorethylene and tridecane, abnormal results were reported by two laboratories. In the case of a high-viscosity oil, the results are clearly different. The expanded uncertainties of all reference densities are below 1,3 · 10-5in relative terms. This satisfies the needs of all customers who wish to calibrate or check liquid density measuring instruments such as oscillation-type density meters. The results of the comparison can be used to entries in the calibration measurement capabilities table in the BIPM key comparison database.
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D.I. Mendeleyev Institute for Metrology (VNIIM), Moskovsky pr. 19, St.Petersburg, 190005, Russian Federation
Azerbaijan Institute of Metrology (AzMI), E. Isakzade set., Kendalan street 7,Baku Narimanov district, Azerbaijan
Kazakh Institute of Metrology Rse (KazInMetr), Left bank, Mangilik El avenue, 11, Nur-Sultan, 010016, Kazakhstan
Center for Standardization and Metrology under the Ministry of Economy of the Kyrgyz Republic (CSM), 197 Panfilov Str., Bishkek, 720040, Kyrgyzstan
National Institute of Metrology (INM), Str. Eugen Coca no. 28. mun., Chisinau, MD2064, Moldova
D.I. Mendeleyev Institute for Metrology (VNIIM)
Azerbaijan Institute of Metrology (AzMI)
Kazakh Institute of Metrology Rse (KazInMetr)
Center for Standardization and Metrology under the Ministry of Economy of the Kyrgyz Republic (CSM)
National Institute of Metrology (INM)
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