Dresden 2006 – scientific programme

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VA: Vakuumphysik und Vakuumtechnik

VA 2: Surfaces, instruments and systems

VA 2.5: Talk

Monday, March 27, 2006, 12:00–12:20, HSZ 101

Traceability and calibration of the new static expansion system of metas. — •Christian Wuethrich¹ and Moussa Coulibaly² — ¹metas, Lindenweg 50, CH-3003 Bern-Wabern — ²Ecole des mines de Douai, 941 rue Charles Bourseul, BP 838, F-59508 Douai

The pressure laboratory of Metas, the Swiss National Metrological Institute, performed the characterisation and the first calibrations of the new static expansion system MSE1 in 2005. The system consists of 4 expansion stages mounted in cascade and allowing an ultimate calculable pressure of 5*10-6*Pa. The volumetric ratios of the system have been measured using the well known technique of gas accumulation by successive expansion and also with the newly developed technique of gas depletion by successive expansion. The results of the two techniques are equivalent within the uncertainties. The consistency of the pressures generated has been demonstrated by comparison in the range 1*Pa to 1000*Pa with a digital piston manometer. The consistency of the system at lower pressure has been demonstrated by determining the accommodation factor of two spinning rotating gauges over 5 decades of pressure, using two different expansion schemes in the system. The standard deviation of the accommodation factors remains well below the uncertainties.