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Measuring instruments for pressure and temperature are used in almost all areas of industrial manufacturing. Because of continuous mechanical, chemical and thermal loading, these instruments age and can therefore not guarantee the correctness of the measured values during the period of time. Through timely calibration, however, the alteration of the measured value could be determined.
Along the way of calibration, the displayed value of the measuring instrument is weighed against the measuring result of another measuring device which is recognized to function correctly and accurately and which itself has been made to coincide directly or indirectly with a national (or international) reference instrument. In a nutshell, to compare measuring results, they must be ? pressure gauge ? to a national or international standard with a chain of comparative measurements. The calibration hierarchy shown in the picture (utilizing the exemplory case of Germany) depicts the traceability of an inspection equipment in a company up to a national standard at the PTB (German national metrology institute).
As a way to ensure traceability used, the following points must be observed, amongst others:
The chain of comparison should not be interrupted.
The measurement uncertainty should be known in each stage of the calibration chain so that the total measurement uncertainty could be calculated. As a rule, a superordinate measuring instrument should have a measurement accuracy 3 to 4 times higher.
Each step in the calibration chain should be documented, like the measurement results.
All bodies following a stage in the chain must prove their competence by means of accreditation.
ไดอะแฟรม must be repeated at appropriate intervals. The periods depend on the demanded measurement accuracy and the technical requirements
Note
The WIKA calibration laboratory is accredited by the German Accreditation Body (Deutsche Akkreditierungsstelle ? DAkkS) relative to DIN EN ISO / IEC 17025 for the measurands temperature, pressure, DC current, DC voltage and DC resistance. Further information on our calibration laboratory or an on-site calibration with the WIKA calibration van are available on the WIKA website. If you are thinking about our services, please feel absolve to e mail us via e-mail.
Know more about the differences between factory calibration and traceable calibration in the following video:
Radius Global Co., Ltd.
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