Establishment of High Pressure Pneumatic Standard up to 40聽MPa at NPLI

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• 作者：Jasveer Singh (1) singhjs@nplindia.org
  Nita Dilawar Sharma (1)
  Om Prakash (1)
• 关键词：High pressure pneumatic standard – ; Characterization – ; Pressure balance
• 刊名：MAPAN
• 出版年：2012
• 出版时间：June 2012
• 年：2012
• 卷：27
• 期：2
• 页码：113-121
• 全文大小：438.4 KB
• 参考文献：1. http://kcdb.bipm.org/appendixC/M/IN/M_IN.pdf.
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  4. R.G. Driver, D.A. Olson, N. Dilawar Sharma and A.K. Bandyopadhyay, Final Report on Key Comparison APMP.SIM.M.P.-K1c:Bilateral Comparison between NIST (USA) and NPLI (India) in the Pneumatic Pressure Region 0.4–4.0 MPa, Metrologia, 44 (2007) 7002.
  5. A.K. Bandyopadhyay et al., Results of the APMP Pressure Key Comparison APMP.M.P-K1c in Gas Media and Gauge Mode from 0.4–4 MPa, Metrologia, 40 (2003) 7002.
  6. J.K.N. Sharma, K.K. Jain, A.K. Bandyopadhyay and G.F. Molinar, Intercomparison of Pneumatic Differential Pressure Measurements at 30–150 kPa at High Line Pressures up to 7.5 MPa, High Temp. High Press. 21 (1989) 727.
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• 作者单位：1. Pressure & Vacuum Standards, National Physical Laboratory, Dr. K. S. Krishnan Marg, New Delhi, 110012 India
• ISSN：0974-9853

文摘

The current paper describes the successful establishment of high pressure pneumatic secondary standard for the realization of national pneumatic pressure scale up to 40 MPa from the previously existing 12 MPa. The traceability as well as the uncertainty in measurement was established through a continuous chain of measurements from very low pressures starting with the ultrasonic interferometer manometer and successive extension in overlapping pressure ranges. For this purpose a piston cylinder assembly designated as NPLI-40, with a pressure range of 0.2–40 MPa was coupled to a mechanical gas booster through a high gas pressure controller. We have experimentally estimated the zero pressure effective area of piston as well as the distortion coefficient which is traceable to the international system of unit SI. The CMC for the same is now on the BIPM website. The results obtained are discussed in detail.