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US 5,317,270 AGranted
Cold cathode ionization vacuum gauge with guard ring
AssigneeThe BOC Group, Inc.
InventorPaul G. Lethbridge
Life of this patent
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Abstract
A vacuum guage of the ionisation type having a guage head comprising a substantially cylindrical cathode sleeve with an inlet at one end for communication with the vacuum with an anode positioned co-axially within the cathode sleeve; the head also has a guard ring interposed between the cathode sleeve and the anode and a vacuum feed through arrangement in which the anode and the guard ring are held substantially concentrically within the cathode sleeve.
Claims7
A gauge head for a vacuum gauge of the ionization type comprising:
- an outer cathode sleeve having an inlet at one end for communication with the vacuum;
- an anode of rod-like configuration coaxially extending into the cathode sleeve at the other end thereof;
- an electrically conductive guard ring interposed between the cathode sleeve and the anode to collect electrical current that would otherwise flow within the gauge head directly from the anode to the outer cathode sleeve;
- the guard ring located at the other end of said outer cathode sleeve and positioned such that said anode extends therethrough;
- anode mounting means for mounting the anode within the guard ring in electrical isolation from one another;
- and
- guard ring connection means for connecting said guard ring to said outer cathode sleeve in electrical isolation from one another.
4 more elements
Dependencies are inferred from the claim text.