The Density Laboratory realizes the derived unit of Density through two high quality polished single crystal Si sphere artefacts of mass ca. 1 kg traceable to the German National Standards of Mass and Length (PTB).
Dissemination of the unit of Density to liquids and solids is accomplished by hydrostatic weighing in the ranges 600 – 2000 kg/m3 and 7700 – 8400 kg/m3 respectively, with relative uncertainty to 10 ppm.
The Laboratory performs density calibrations of:
1 mg-1kg weight standards
Range 7700 – 8400 kg/m3
Relative Uncertainty 10 ppm
2 kg-20kg weight standards
Range 7800 – 8300 kg/m3
Relative Uncertainty 0,06%
digital density meters
Range 600 – 2000 kg/m3
Relative Uncertainty <0,01%
hydrometers
Range 600 – 1300 kg/m3
Relative Uncertainty <0,10%