IN-SITU LIQUID DENSITY MEASUREMENT FOR LIQUID COLUMN MANOMETRY

S. Ehlers

Abstract

At PTB, an interferometric liquid column manometer for the pressure measurement up to 2 kPa is under development. Its in-situ liquid density measurement is a new approach for those primary pressure standards and makes the use of low-density liquids – low in comparison with the density of mercury, a liquid often used in other standards – possible. Such liquids, here, vacuum oils, offer an excellent sensitivity in length changes against pressure. The liquid density measurement concept is presented, together with the uncertainty estimation.

Keywords

liquid density; liquid column manometer; density standard; hollow sphere; primary pressure standard

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IMEKO-TC16-2022-052.pdf

DOI

10.21014/tc16-2022.052

IMEKO TC

TC16 - Pressure and Vacuum Measurement

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