Calibration, handling repeatability, and the Maximum Permissible Error of single-volume glass instruments

Abstract

The influence quantities for the uncertainty of a volumetric operation with glass instruments are calibration, repeatability and temperature. In the literature, measurement uncertainty budgets can be found, which count all three quantities separately although calibration and repeatability are merged in tabulated data to the Maximum Permissible Error. We propose that this error should be handled as a rectangular distribution in order to get a standard uncertainty. For the daily use in an analytical laboratory, the combined standard uncertainty of a volumetric operation is thus calculated from the Maximum Permissible Error plus the uncertainty of the temperature influence. Keywords Glass volumetric instruments Á Maximum Permissible Error Á Measurement uncertainty Á Measuring flasks Á Pipettes Á Single-volume glass instruments Á Uncertainty of volumetric operations

Critical Metrological Evaluation of Fuel Analyses by Measurement Uncertainty

“…, where ∆T is the possible temperature range, γ the coefficient of volume expansion of the liquid and 0 V is the liquid volume [17]. Resolution of a measuring system is the smallest change in the value of a quantity being measured by a measuring system that causes a perceptible change in the corresponding indication.…”

“…Considering the non correlated quantities, the combined standard uncertainties derived from (1), when applied to (17) are in (18) and (19), which are detailed in Table 4: …”