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| Uncertainty Evaluation and Capability Verification of Gas Flow Close Loop Standard Facility |
| LI Chun-hui1,CI Li-shui1,WANG Chi1,CAO Peng1,WANG Su2 |
1. China Institute of Metrology, BeiJing 10029, China
2. Inner Mongolia Institute of Metrology and Testing, Hohhot, Inner Mongolia 010000, China |
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Abstract At the end of 2014, the first gas flow close loop standard facility in China was built in National Institute of Metrology (NIM). The standard facility uses four DN100 turbine flowmeters as master meters, and the achievable flowrate range is 40~1400m3/h as well as the pressure range is 190~2500kPa. Based on the in-situ calibration technology of the master meter and the pressure measurement method of absolute pressure+differential pressure, the best uncertainty of the standard facility to calibrate the flowmeter is 0.18%(k=2). In January 2020, the gas flow close loop standard facility passed the construction standard assessment, and the testing service was officially launched in March 2020.
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