Development of the Calibration Facility for Small Mass Flow Rates of Gases and the Sonic Venturi Nozzle Transfer Standard

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概要

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• A calibration facility based on the gravimetric method has been developed at NRLM for small mass flow rates of gases. This calibration facility establishes a primary gas flow measurement standard in Japan with an expanded maximum uncertainty of ±0.12 percent for small mass flow rates from 0.1 g / min to 50 g / min for nitrogen gas. Five sonic Venturi nozzles were tested using this facility and the results showed that they can work well as a flow transfer standard for small mass flow rates. These sonic Venturi nozzles can be used to establish flow transfer standards within an expanded uncertainty of ±0.15 percent.

• 一般社団法人日本機械学会の論文
• 1999-11-15

著者

• Nakao Shin-ichi

  National Research Laboratory Of Metrology Fluid Measurement Section

• TAKAMOTO Masaki

  National Research Laboratory of Metrology, Fluid Measurement Section

• Takamoto Masaki

  National Research Laboratory Of Metrology Fluid Measurement Section

関連論文

• Development of the Calibration Facility for Small Mass Flow Rates of Gases and the Sonic Venturi Nozzle Transfer Standard
• Preliminary Intercomparison of Anemometer Calibration Systems at Very Low Speeds between the National Standard Laboratories in Japan and the USA

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