Research on the Metrological Traceability for Bell Prover

The bell prover is a measurement standard that uses air as the medium to transfer the gas flow quantity value. The national metrological verification regulation JJG 165-2005 "Verification Regulation of Standard Bell Provers of Gas Flow" stipulates that bell prover can be performed by the volume method and geometric method. China has not conducted any systematic experimental research on the verification method and its process of the bell provers and needs to solve the problem of transferring the measurement value of gas flow measurement. There is no direct correlation (transfer) between the values of bell prover gas flow from the national metrology institute to each provincial metrology institute. The individual components are traceable to length, mass, and time references, respectively. This paper discusses the research of the method of transferring the values of the gas flow standard device to establish the physical quantity transfer relationship of the national primary standards and the local standard gas flow standards. The test proves that the standard table value transfer relationship can be used to regulate the value transferred by the bell prover gas flow device, so that the national flow primary standard, the provincial flow standard, the local prover standard value can be linked to achieving the traceability.