Comparison of pVTt Methods Gas Flow Prover

摘要

We compared 20m~(3) and 2m~(3) facilities of pVTt methods gas flow primary prover (pVTt prover) in Flow lab of National Institute of Metrology of China (NIM). We used sonic critical venturi nozzle (sonic nozzle) as transfer standard. The flow points of comparison are about 100nm~(3)/h and 150nm~(3)/h. We completed four comparison tests whose results are considered acceptable, whereas we found there was a little systematic error between the two facilities.