Author： Niederhauser B. Barbe J.
Publisher： IOP Publishing
ISSN： 0026-1394
Source： Metrologia, Vol.39, Iss.6, 2003-01, pp. : 573-578
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Abstract
In order to evaluate the concordance of two primary low-gas-flow standards based on completely different principles with different traceability to the International System of Units (SI), the Laboratoire National d'Essais (BNM-LNE, France) and the Swiss Federal Office of Metrology and Accreditation (METAS, Switzerland) carried out a bilateral comparison. The two measuring principles - dynamic gravimetry at the BNM-LNE and dynamic volumetry at METAS - were compared by means of a commercial transfer standard molbox/molbloc with flows of nitrogen in the range from 3 ml/min to 10 l/min at 0 °C and 101.325 kPa (3.75 mg/min to 12.5 g/min). The measurement results show relative differences between the two primary standards of less than ±0.1 % for flows in the range 10 ml/min to 10 l/min.
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