COMPARISON MEASUREMENTS OF 2 STANDARD HYDROMETERS

In 1992, comparison measurements of two standard hydrometers were carr ied out by the Hungarian National Office of Measures (OMH, Budapest), the Osterreichisches Bundesamt fur Eich- und Vermessungswesen (BEV, Vi enna) and the Laboratories ''Density'' (at Ilmenau) and ''Liquid Prope rties'' (in Braunschweig) of the Physikalisch-Technische Bundesanstalt (PTB). It was the aim to ascertain to what degree the hydrometer link -up measurements of these laboratories correspond. All participating l aboratories used the Cuckow method of hydrostatic weighing of the hydr ometers immersed up to the calibration points in a liquid of known den sity, the uncertainties of measurement achieved ranging between 0,03 k g. m-3 and 0,05 kg . m-3. The scale intervals of the hydrometers are 0 ,1 kg . m-3. The measurement results are in good agreement; they devia te only within the uncertainties stated by the laboratories.