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- W2009421666 abstract "Vacuum pressure standards of the orifice‐flow type require known gas flows of 10−6 mol/s (10−2 atm cm3/s at 0 °C) and less. Known gas flows can also be used to calibrate ‘‘standard’’ leaks by comparing the pressures generated when flows from the leak and the flowmeter are alternately passed through a constant conductance. Two constant‐pressure, piston displacement flowmeters developed at the National Bureau of Standards are described that can generate flows between 10−6 and 10−10 mol/s with an estimated uncertainty of 0.8% to 2%. Comparisons of the flowmeters with alternate calibration techniques, and repeated low‐range leak and vacuum gauge calibrations, have been used to confirm the estimated uncertainty and random errors of the flowmeter." @default.
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- W2009421666 date "1987-05-01" @default.
- W2009421666 modified "2023-10-18" @default.
- W2009421666 title "Low‐range flowmeters for use with vacuum and leak standards" @default.
- W2009421666 doi "https://doi.org/10.1116/1.574163" @default.
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