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NML Pilots CIPM Low-pressure Gas Flow Key Comparison

National Measurement Laboratories (NML) R.O.C., entrusted by Bureau of Standards, Metrology and Inspection (BSMI), Ministry of Economic Affairs (MOEA), is responsible for establishing and maintaining the national metrology standards for the traceability for domestic industry. With its accumulated capability, NML has volunteered as a pilot and coordinate the International Committee for Weights and Measures (CIPM) low-pressure gas flow key comparison this year. Ten laboratories from 4 Regional Metrology Organizations (RMOs) are participating in the comparison, including: NML (Chinese Taipei), INRIM (Italy), LNE (France), PTB (Germany), CMI (Czech), METAS (Switzerland) , KRISS (Republic of Korea), , NMIJ (Japan), NMIA (Australia), and NIST (United States).

Key comparison is an essential activity of national metrology institutes, with the purpose of determination of the degree of equivalence of the national standards. The comparison is accomplished by each laboratory calibrating a transfer standard that is circulated among the participating labs. The comparison results and Calibration and Measurement Capabilities (CMCs) are publicly available in the key comparison database (KCDB) kept by International Bureau of Weights and Measures (BIPM). Certificates supported by CMCs published in the KCDB are accepted worldwide at whatever accuracy is stated in the database. This is the first time for NML pilots CIPM key comparison and demonstrate NML’s capability in flow field.

The measurement of low-pressure gas flow is vital to economic growth and high-tech competitiveness, and has wide applications such as in oil and natural gas transactions and in flow control in the manufacturing process of high-tech factories. Taking home gas meters as an example, the standard of low-pressure gas flow established by NML supports Government’s credibility, via traceability, to guarantee the fairness of a trade that amounts to more than 50 billion NT dollars each year. Other applications include dilution gas standards for PM2.5 environmental monitoring, and gas control or measurement in optical communication/semiconductor industries.

For the comparison, NML has completed the technical protocol and is preparing the pre-test for the transfer standard - a high precision transfer standard. NML plan to send out the transfer standard to participants one by one starting in October 2017 and expect to complete the circulation before July 2019.

Agency in charge: Metrology Administration Department (4th Division)
Contact person: Mr. Liou, Bing-Yuan
Telephone: (02)2397-1326


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