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AK-Practice Useful Lifetime of Devices

from 2020-06-15

In SIL certificates and, in some cases, in operating or instruction manuals, manufacturers specify a maximum useful lifetime or an "expiration date" for the failure rates of their devices. This attests a period in which the devices have a constant probability of faults according to the manufacturer. Certificates recommend that devices be replaced after a certain number of years.
For the user, the question therefore arises whether these devices may be used beyond the useful lifetime recommended by the manufacturer.
This WG-practice tackles this issues and gives relevant examples. You find the document at WG 4.5.


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