Abstract
It is noticeable the importance of calibrating measuring instruments, as this process seeks to ensure metrological reliability. Therefore, it becomes possible to verify if the instruments present consistent results. This way, the metrological laboratory needs to keep its equipment calibrated, aiming to offer a satisfactory service to its customers. As the periodicity of instrument calibration is variable, i.e., they have different periods, due to the fact that this time depends on the usage frequency of the equipment, its manufacturing nature, the quality of its material, the environment in which it is being submitted, among other factors. This period variability leads to problems in the quality of the provided services, increase the costs in the logistics sector, in addition to causing managerial difficulties. For this reason, a calibration plan was presented, based on historical data of standard unavailability, aiming to estimate fixed calibration periods and, consequently, mitigate the observed problems.
Highlights
One of the most common ways of checking if a piece of measurement equipment presents reliable readings is through calibration, which, according to the International Vocabulary of Metrology [1], consists in a process that seeks to define error and inconsistency of a certain equipment in various aspects though a comparison between the measured values and the standard indications under specific conditions, associating sources of uncertainty and establishing relations between the equipment being calibrated and the reference standard
The laboratory reference standards calibrate clients’ measuring instruments, which, on their turn, can calibrate other devices. It becomes a metrological traceable chain, which according to Santana et al [2], is a property of a measurement result whereby the result can be related to a reference through a documented unbroken chain of calibrations, each contributing to the measurement uncertainty, working in a similar fashion to a pyramid, in which equipments from a higher level in this structure serve as standards and calibrate the ones from the lower levels, and each calibration contributes to the measurement uncertainty
According to the data verified, it was possible to attest the applicability of this study, since it allows the implementation of a calibration plan for the metrological instruments of a laboratory
Summary
The importance of measurement in all levels of society is visible, both regarding industrial activities and activities related to daily life, as it is used in processes of quality assurance for products, in the comparison of equipment performance, to define manufacturing specifications, among other uses.As such, it becomes essential to utilize instruments which can guarantee accurate measurement results that present acceptable values within a certain confidence level.One of the most common ways of checking if a piece of measurement equipment presents reliable readings is through calibration, which, according to the International Vocabulary of Metrology [1], consists in a process that seeks to define error and inconsistency of a certain equipment in various aspects though a comparison between the measured values and the standard indications under specific conditions, associating sources of uncertainty and establishing relations between the equipment being calibrated and the reference standard.In other words, it is a process in which occurs a comparison between a laboratory standard and whichever equipment from a client is submitted to calibration. One of the most common ways of checking if a piece of measurement equipment presents reliable readings is through calibration, which, according to the International Vocabulary of Metrology [1], consists in a process that seeks to define error and inconsistency of a certain equipment in various aspects though a comparison between the measured values and the standard indications under specific conditions, associating sources of uncertainty and establishing relations between the equipment being calibrated and the reference standard. It becomes a metrological traceable chain, which according to Santana et al [2], is a property of a measurement result whereby the result can be related to a reference through a documented unbroken chain of calibrations, each contributing to the measurement uncertainty, working in a similar fashion to a pyramid, in which equipments from a higher level in this structure serve as standards and calibrate the ones from the lower levels, and each calibration contributes to the measurement uncertainty
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