Siemens SITRANS L Operating Instructions Manual page 29

Access protection
6.2 Protection of the parameterization
Device Access PUK
The Device Access PUK allows unlocking the device in case the user PIN is no longer
known. It can't be changed. The Device Access PUK can also be found on the supplied
information sheet ""Device Bluetooth and Parameter Access Codes". If this document
is lost, the Device Access PUK can be retrieved from your personal contact person
after legitimation. The storage and transmission of the user PIN is always encrypted
(SHA 256 algorithm).
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SITRANS LR100
Operating Instructions, 10/2021, 62705-76-01