Traceability

Measuring Under Priced for pressure and temperature are employed in almost all areas of industrial manufacturing. Due to continuous mechanical, chemical and thermal loading, these instruments age and can therefore not guarantee the correctness of the measured values over the course of time. Through timely calibration, however, the alteration of the measured value can be determined.
In the process of calibration, the displayed value of the measuring instrument is compared with the measuring consequence of another measuring device which is known to function correctly and accurately and which itself has been designed to coincide directly or indirectly with a national (or international) reference instrument. In short, in order to compare measuring results, they must be ?traceable? to Blast or international standard with a chain of comparative measurements. Doubtful shown in the picture (utilizing the example of Germany) depicts the traceability of an inspection equipment in an organization up to a national standard at the PTB (German national metrology institute).
So that you can 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 the total measurement uncertainty can be calculated. As a rule, a superordinate measuring instrument must have a measurement accuracy 3 to 4 times higher.
Each step in the calibration chain should be documented, like the measurement results.
All bodies carrying out a stage in the chain must prove their competence through accreditation.
Calibrations should be repeated at appropriate intervals. The periods be determined by the demanded measurement accuracy and the technical requirements
Note
The WIKA calibration laboratory is accredited by the German Accreditation Body (Deutsche Akkreditierungsstelle ? DAkkS) in accordance with DIN EN ISO / IEC 17025 for the measurands temperature, pressure, DC current, DC voltage and DC resistance. More info on our calibration laboratory or an on-site calibration with the WIKA calibration van are available on the WIKA website. Should you be interested in our services, please feel free to e mail us via e-mail.
Find out more on the differences between factory calibration and traceable calibration in the following video:

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