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| Accurate Measurement of Volume Expansion of Standard Gas Cylinder |
| WANG De-fa,WU Hai,HUANG Peng,WANG Zhen,WANG Man,LIU Zhi-yong,FENG He-ping,HAN Qiao |
| National Institute of Metrology, Beijing 100029, China |
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Abstract At present, the Gravimetric method is widely used to prepare standard gas. In the process, the uncertainty contribution of air buoyancy introduced by cylinder volume expansion can not be ignored. A device for measuring the gas-filling expansion rate of cylinder is designed. The device can control the pressure of gas filled in cylinder, and measure the volume expansion of cylinder by a precise pipette, so as to accurately calculate the gas-filling expansion rate of cylinder. By using the device, the common 2L, 4L, and 8L aluminum alloy gas cylinders in China are measured. The results show that the expansion volume of cylinder is approximately linearly related to the gas pressure in the cylinder. Moreover, the larger cylinder appearance volume is, the larger gas-filling expansion rate is, and there is a strong correlation between cylinder appearance volume and gas-filling expansion rate. Based on the obtained gas-filling expansion rate data of cylinder, the contribution of cylinder volume expansion to the mass uncertainty of gas filled in cylinder can be further reduced, thus making the calculation of gas mass more accurate.
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Received: 31 January 2020
Published: 18 October 2021
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2021, Vol. 42 
