Usability of measuring instruments calibration

The measuring instruments are directly present in any production process, regardless of the services or products manufactured. Any company pays for electricity, heating, water consumption and other facilities. Once with the industrialization and automating of technological processes, the dependence of the efficiency of production processes on the measuring instruments increased. Now they have also to dose the ingredients of the end products, to appreciate their quality, and to prevent the deviations from the established quality parameters.

But the utility of the production processes has more aspects, including the support in assuring:

• the quality of products

• the uniformity of products

• the safety of products

• the rationality of consumption (raw material, water, electricity etc)

• the accountancy

• the gathering of information for the maintenance and enhancement of the efficiency of production processes

The uniformity and accuracy of the measurements performed in the Republic of Moldova is assured through a set of technical and organizational measures, which include also the activity of dissemination of measurement units to the rest of the measurement standards and further to working standards.

Based on the destination of the measuring instrument, the intensity of its use and the exploitation conditions, it is necessary to observe its metrological characteristics. This requires the performance of a calibration. In order to determine the reasonable periodicity, several consecutive calibrations shall be performed at short intervals of time and their results shall be analyzed.

The dissemination of measurement units from the national standards to the measurement instruments used in the national economy is done through calibration.

Calibration must not be mistaken with the metrological verification or rectification of measuring instruments. Calibration is the activity of examining an equipment that, in specified conditions, establishes: in a first phase, a relation between the relevant measurement values and uncertainties provided by the standards and the reading of the calibrated equipment, and the associated measurement uncertainties; in a second phase, this information is used to establish a relation that would allow to obtain a measurement result starting from a read-out.

To be sure of the measurements performed in the Republic of Moldova, it is important to follow a continuous chain of measurements from international standards to work measuring instruments. The metrological traceability of the measurement results is performed through calibrations in the metrological laboratories. The traceability of national standards to the International System of Units (SI) is done through their comparison to the international standards.

The National Institute for Metrology, being the owner of the National Measurement Standards Database, assures the dissemination of measurement units through calibrations, high quality service provided through modern equipment. All calibrations are performed based on developed and validated calibration procedures. For the quality of calibrations, an important role is assigned to the maintenance of certain environment conditions, continuous examination of the equipments of the National Measurement Standards Database, training of the specialists, as well as the development and implementation of a well structured and functional management system.

In order to inform and facilitate the access to services, INM offers to the stakeholders a wide range of calibration services, structured on measurement areas:

“Mass and related quantities” laboratory

“Physical-chemical measurements” laboratory

“Temperature and humidity measurements” laboratory

“Electromagnetic, time and frequency measurements” laboratory

“Dimensional measurements” laboratory

“Volume and flow” laboratory

“Ionizing radiations” laboratory

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