4.3.2 Master meter method

Firstly, a master meter for flowrate is calibrated by another flow or volume reference standard. Secondly, a pipe prover under calibration is calibrated using the master meter, where the master meter functions merely as an intermediate link between the reference standard and the prover under calibration. Therefore, before and after the calibration, it is necessary to assure that the performance of the master meter is stable by using the reference standard. A typical arrangement of the master meter method is shown in Figure A.9.