Robert F Berg and Giorgio Cignolo 2003 Metrologia 40 154 doi:10.1088/0026-1394/40/4/303
NIST–IMGC comparison of gas flows below one litre per minute
Robert F Berg1 and Giorgio Cignolo2
Show affiliationsWe compared the IMGC and NIST standards for small gas flows at the IMGC. The IMGC standard is a recently developed primary flow meter that extracts a large piston out of a temperature-controlled chamber. Controlling the piston's speed holds the pressure in the chamber constant. The NIST standard is a recently developed transfer standard that was calibrated against two primary standards at NIST. The first NIST primary extracts a large piston out of an oil-filled chamber in which a metal bellows is suspended. Controlling the piston's speed holds the pressure in the bellows constant. The second NIST primary is a static gravimetry method.
The results include 49 nitrogen flow rates from 0.22 µmol s−1 to 770 µmol s−1 (1 µmol s−1 = 1.3448 cm3 min−1 of an ideal gas at the 'standard' conditions of 0 °C and 101 325 Pa). For all but one of the comparisons, the agreement between IMGC and NIST is better than 0.06%.
- PACS
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47.80.-v Instrumentation and measurement methods in fluid dynamics
- Subjects
- Dates
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Issue 4 (August 2003)
Received 4 December 2002
Published 13 June 2003
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NIST–IMGC comparison of gas flows below one litre per minute
Robert F Berg and Giorgio Cignolo 2003 Metrologia 40 154
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