Measurement of pressures up to 7 MPa applying pressure balances for dielectric-constant gas thermometry. (19th August 2015)

• Record Type: Journal Article
• Authors: Zandt, Thorsten; Sabuga, Wladimir; Gaiser, Christof; Fellmuth, Bernd
• Is Part Of: Metrologia. Volume 52:Number 5(2015:Oct.)
• Page Start: S305
• Page End: S313
• Publication Date: 2015-08-19
• Subjects: gas pressure balance -- effective area -- pressure distortion coefficient -- dielectric-constant gas thermometry -- Boltzmann constant; Weights and measures -- Periodicals; Weights and Measures -- Periodicals; 530.805
• DOI: 10.1088/0026-1394/52/5/S305
• Languages: English
• ISSNs: 0026-1394

Abstract

Abstract: For the determination of the Boltzmann constant by dielectric-constant gas thermometry, the uncertainty of pressure measurements in helium up to 7 MPa has been decreased compared with previous achievements (Sabuga 2011 PTB-Mitt .121 247–55). This was possible by performing comprehensive cross-float experiments with a system of six special pressure balances and the synchronization of their effective areas. It is now possible to measure a helium pressure of 7 MPa with a relative standard uncertainty of 1.0 ppm applying a 2 cm 2 piston-cylinder unit, the calibration of which is traceable to the SI base units.