| 摘要 |
The invention relates to a field device ( 1 ) for determining and/or monitoring a physical and/or chemical process variable of a medium ( 5 ) in a container ( 6 ), including a first sealing stage ( 10 ) facing the process, at least one housing ( 15 ) having a predetermined internal volume ( 16 ), which is provided on the side of the first sealing stage ( 10 ) facing away from the process, wherein in the housing ( 15 ) at least one opening ( 20 ) is provided, which connects the internal volume ( 16 ) of the housing ( 15 ) with a space outside of the container ( 6 ). The invention includes that in the internal volume ( 16 ) an intermediate medium ( 21 ) is present, which is of a character such that it indicates via the opening ( 20 ) the case in which the first sealing stage ( 10 ) no longer seals.
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