Field device for determining and/or monitoring a process...

Details Field device for determining and/or monitoring a process... Field device for determining and/or monitoring a process...

2006-12-05

2006-12-05

Williams, Hezron (Department: 2856)

Measuring and testing

Testing sealed receptacle

Reexamination Certificate

active

07143636

ABSTRACT:
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.

REFERENCES:
patent: 5796097 (1998-08-01), Lawrence
patent: 6063632 (2000-05-01), Perkins
patent: 2003/0030517 (2003-02-01), Munley et al.
patent: 2004/0232620 (2004-11-01), Bock et al.
patent: 2 228 761 (1973-01-01), None
patent: 101 44 230 (2003-03-01), None
patent: 2 330 659 (1999-04-01), None

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