04902962 is referenced by 8 patents and cites 6 patents.

In an apparatus for detecting the surface of a liquid or foam, for example in a fermentation vessel a detector electrode (10) is surrounded at its lower end by a protective shroud (12) so as to protect a confined vapor space (14) surrounding the detector electrode. The vapor in the space (14) is maintained at a relatively low humidity either by heating the detector electrode or some other part of the apparatus or by purging the space (14) with a relatively dry air or gas. It is thereby ensured that no condensation onto the O-ring seal (20) and surrounding parts takes place. The shroud (12) also protects the parts from splashing.

Title
Detection of the surface of a liquid or foam including moisture inhibiting
Application Number
7/269134
Publication Number
4902962
Application Date
November 9, 1988
Publication Date
February 20, 1990
Inventor
Yoichi Ishikawa
Tokyo
JP
Agent
Barnes Kisselle Raisch Choate Whittemore & Hulbert
Assignee
Able Corporation
JP
IPC
G01N 27/02
G01R 27/26
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