On-line calibration facility of compressed hydrogen dispenser based on weighing method and master meter method

Abstract

Abstract This paper introduces a kind of on-line calibration facility based on weighing method and master meter method, which can carry out the on-site and laboratory calibration of 35MPa/70MPa hydrogen dispenser. At first, the working principle and technical specifications of the hydrogen dispenser is explained. Then the working principle and design structure of the calibration facility is depicted. Finally, the calibration facility is used to perform the real flow calibration test on hydrogen dispenser. According to the test results, the expanded uncertainty of the calibration facility of master meter method is about 0.7% (k=2), and the expanded uncertainty of the calibration result is 0.96% (k=2); and the expanded uncertainty of calibration facility of weighing method is about 0.097% (k=2), and the expanded uncertainty of calibration result is 0.48% (k=2). The real flow test shows that the two method calibration facilities both can be used for actual calibration of 2.5-level hydrogen dispenser. The calibration facility of weighing method is suitable for the occasions with high accuracy requirements because of its short traceability chain, while the calibration facility of master meter method can be used for flexible on-line calibration because of its simple structure.