Disclosed is a filter device, particularly a liquid filter, comprising a filter element that is disposed in a filter housing and a heater for heating medium flowing through the filter device. The structure includes a fuel layer with a separate fuel cell stack adjacent to each side of the fuel layer. The tags can be applied to the component immediately after manufacture and can be subjected to the sterilization process without risk of data loss or corruption. For this purpose, a first challenge is sent from a first data processing unit to a second data processing unit, which transmits a first response back.