Precision scale or mass comparator with module for detecting a measurement uncertainty

Abstract

The invention relates to a precision scale with a scale chamber (16), a windshield (18, 20, 22) which surrounds the scale chamber (16), an air conditioning module (34) which is removably arranged in the scale chamber (16), a processor (32) which is arranged in the precision scale, a data input unit which is arranged on the precision scale, and a data transmission path with which data can be exchanged between the air conditioning module (34) and the processor (32), said processor (32) containing a measurement uncertainty detection module (33) with which the measurement uncertainty of the scale can be ascertained. The invention also relates to an air conditioning module for electrically coupling to a precision scale in a removable manner, said air conditioning module (34) forming a sealed unit and having an air pressure sensor (62), a humidity sensor (54), an air temperature sensor (52), and a part of a data transmission path via which data can be transmitted to a processor outside of the air conditioning module. The invention finally relates to a method for determining the measurement uncertainty of a precision scale comprising a scale chamber (16) which is separated from the surroundings by a windshield and in which an air pressure sensor (62), a humidity sensor (54), and an air temperature sensor (52) are arranged, said sensors (52, 54, 62) being coupled to a processor (32). Goods to be weighed, in the form of a test object, are weighed, and the following steps are carried out: - ascertaining the air pressure, the humidity, and the air temperature in the scale chamber (16) using the sensors (52, 54, 62); - weighing the test object; - determining the standard uncertainty of the weighing method; - determining the standard uncertainty of the mass of the test object; and - ascertaining a total uncertainty of the scale result.

Description

technical field [0001] The invention relates to a precision weighing device or a mass comparator. Background technique [0002] The problem with such high-resolution electronic precision weighers and mass comparators is that a large number of external parameters influence the weighing result. When the measurement error should be less than 10 ppm in the mass determination of a test object or in the case of a weighing process, the operator has to also take into account the measurement uncertainty. [0003] The measurement uncertainty is influenced in particular by the air density present during the measurement, which has an effect on the buoyancy of the test object and is dependent on the ambient temperature, air pressure and air humidity. The user has an influence on the measurement result and thus on the measurement uncertainty, since the manner and method in which the measurement is carried out has an influence on how accurately the determined measurement result can be rep...

AI Technical Summary

Problems solved by technology

[0002] The problem with such high-resolution electronic precision scales and mass comparators is that there are a large number of external parameters that affect the weighing results

The computer has no influence on the overall weighing process; it only reads the weight from the scale

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