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Calibration is the comparison of a measuring instrument’s readings with certified standards to determine corrections and measurement uncertainty. It verifies the instrument’s accuracy and suitability, ending with a calibration certificate. The process follows procedures in the lab’s quality system.
The laboratory, at the request of the customer, before calibration of Termoprodukt instruments, if necessary, performs adiustation of measuring instruments. This is an action aimed at minimizing the errors of indications of measuring instruments, improving their accuracy. Adjustication is carried out according to the procedure established by the manufacturer, based on the construction of the device and its characteristics.
Calibration confirms the accuracy of measuring instruments, especially where health and safety are critical. It’s essential for devices used in drug, food, and hygiene production and storage. Calibration is required by systems like GMP, GHP, and HACCP.
Calibration establishes the relationship between the standard of the measurand (temperature, humidity, etc.) and the measuring instrument. In order for a measuring instrument to perform its function at its best, it is important that it be checked, calibrated, at points (temperature, humidity, etc.) corresponding to its operation. Calibration is carried out at the points specified in the order by the customer, reflecting the working conditions of the measuring instrument. If the instrument works over a wide temperature range, calibration taking into account the entire working range is recommended, while if it works at a specific temperature or humidity, calibration at this one point is sufficient. Calibration points should be selected to correspond to the operation of the measuring instrument.
The timing of subsequent calibrations should be determined by the user himself, taking into account the manufacturer's recommendations and legal standards. In a simplified way, it is assumed that a given measuring instrument in use should be calibrated at least once a year. Measuring instruments that are used intensively, around the limits of the measuring ranges, should be calibrated more often than those that are used infrequently and their operating conditions are far from the limits of the measuring range. If the readings of a measuring instrument are questionable, calibration should be carried out as soon as the abnormality is noticed. Factors affecting the calibration interval: recommendations of the instrument manufacturer, intensity and range of use, required uncertainty, adjustment or change in the instrument, influence of the measurand, legal standards.