Method for determining a measurement error caused by a filling error

A method for determining a measurement error (ρerror) caused by a filling error during measurement of a density(ρ) of a liquid by means of a densimeter having a flexural resonator containing the liquid to be measured, wherein, during a measuring operation, a period duration of an oscillation of the flexural resonator induced by an induction unit is measured by a measuring device and the density (ρ) of the liquid is determined by an evaluation unit, the method comprising:

• determining a first pressure-dependent density difference (Δρ(P)) by subtracting the determined density (ρ) of the liquid pressurized with a first pressure (P0) by a pressurizing means during a first measuring operation and of the liquid pressurized with a second pressure (P) by means of the pressurizing means during a second measuring operation;
• and
• determining the measurement error (ρerror) via the equation
• Δρ
• ⁡
• (
• P
• )
• =
• (
• P
• -
• P
• 0
• )
• ·
• (
• ρ
• error
• P
• +
• 1
• E
• )
• ,
• wherein for solving the equation, either a compressibility (E) depending on the measured liquid is selected or at least one further density difference (Δρ(P)) is determined by subtracting the determined density (ρ) of the liquid pressurized with the first pressure (P0) by the pressurizing means during the first measuring operation and of the liquid pressurized with at least a further pressure (P) by the pressurizing means during at least one second measuring operation.