Calibration apparatus for vacuum gauge having combined use...

Details Calibration apparatus for vacuum gauge having combined use... Calibration apparatus for vacuum gauge having combined use...

2008-07-01

2008-07-01

Raevis, Robert R (Department: 2856)

Measuring and testing

Instrument proving or calibrating

Fluid pressure

C073S001650

Reexamination Certificate

active

07392686

ABSTRACT:
Disclosed herein is a calibration apparatus for vacuum gauge having a combined use for an 1 Torr level, a 10 Torr level, and a 100 Torr level vacuum gauge. According to the present invention, there is provided a calibration apparatus for vacuum gauge, in which a standard pressure gauge140, 142is installed within a pressure vessel120for calibrating a monitoring pressure gauge560, the apparatus comprising: a balance mounting shaft134installed vertically within the pressure vessel120and provided with a plurality of balance mounting bases138spaced apart from one another at predetermined intervals along an axial direction, and the standard pressure gauge140, 142being connected to lower portion of the balance mounting shaft; a plural sets of balances mounted between the respective balance mounting bases138, each of which is composed of a plurality of balances; means for elevating each balance of the plural sets of the balances from the balance mounting base138separately or mounting the balance on the balance mounting base138; and means for controlling the operation of the elevating means according to commands received from the outside.

REFERENCES:
patent: 2719431 (1955-10-01), Grant
patent: 3028745 (1962-04-01), Muires
patent: 3464256 (1969-09-01), Lloyd
patent: 3956939 (1976-05-01), Bonk et al.
patent: 4604891 (1986-08-01), Sgourakes et al.
patent: 4658829 (1987-04-01), Wallace
patent: 5331838 (1994-07-01), Delajoud

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