Pirani vacuum gauge

Details Pirani vacuum gauge Pirani vacuum gauge

2005-11-07

2009-10-27

Allen, Andre J (Department: 2855)

Measuring and testing

Fluid pressure gauge

Electrical

C073S753000, C073S754000

Reexamination Certificate

active

07607356

ABSTRACT:
A Pirani vacuum gauge in which dependency of temperature of a filament on variation of gas pressure is raised and the gas pressure can be measured with high accuracy. The Pirani vacuum gauge includes a cylindrical body2in which the interior communicates with a space to be measured for pressure; a filament1enclosed in the cylindrical body2; and a pipe7surrounding the filament1in the cylindrical body, the least distance between the facing inner walls of the pipe being equal to less than 6 mm and the pipe7covering more than 80% of the length of the filament1.

REFERENCES:
patent: 3411362 (1968-11-01), Arasim, Jr.
patent: 4995264 (1991-02-01), Stocker et al.
patent: 6185351 (2001-02-01), Daneshvar et al.
patent: 7120339 (1993-10-01), None

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