| Zugriffsnummer | 42842 |
| Dokumenttyp | Konferenzartikel |
| Peer Review | unbekannt |
| Sprache | Englisch |
| Titel | The bilateral comparison between NIM and PTB for small gas flow |
| Autor(in); Institution |
Li, Chunhui; National Institute of Metrology (NIM) China, Beijing, CHINA
Mickan, Bodo; 1.4, Gase, PTB-Braunschweig
Gao, Shan; Hebei University, Baoding, CHINA
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| Quelle/Jahr | FLOMEKO 2019 - 18th International Flow Measurement Conference: proceedings:(2019), 1 - 6 |
| Availability | [online only] |
| URL | |
| Konferenzangaben | 18th International Flow Measurement Conference - FLOMEKO 2019, Lisbon, 26-28, June, 2019, Portugal |
| Freie Schlagworte | pVTt facility ; sonic nozzle |
| Zusammenfassung | With the development in the field of biomedicine, environmental monitoring, and so on, the requirement on the accuracy of small gas flow measurement is dramatically increased, which results in the increasing requirement on the accuracy of small gas flow facility. In NIM, the 100L pVTt facility was developed for small gas flow rate, which was built in 2010. But, the leakage and the big mass change in the inventory volume showed significant impact on the accuracy of the facility, especially for small gas flow rate, which was solved at the end of 2017. The uncertainty of the discharge coefficient for the sonic nozzle could be 0.15% (k=2) when the flow rate is larger than 0.1 m3/h, while it could be 0.25% (k=2) for smaller flow rate. The bilateral comparison between NIM and PTB for small gas flow rate was carried out with 4 sonic nozzles with flow rate 0.02 m3/h, 0.04 m3/h, 0.13 m3/h, 0.50m3/h, and pressure range (85~1000) kPa. On the base of the good consistency of the comparison results, the uncertainty and the measurement capability of the 100 L pVTt facility were verified. |
| Kostenfreier Zugang | Freier Zugang |
| Themenbereich der Metrologie | Durchfluss |