Measuring and testing – Gas analysis – Density or specific gravity
Patent
1993-06-04
1995-06-06
Williams, Hezron E.
Measuring and testing
Gas analysis
Density or specific gravity
73580, 73 2405, G01H 1300, H01L 4122
Patent
active
054211905
ABSTRACT:
The device serves to measure the density of a gas, in particular of the insulating gas of a gas-insulated electrical installation. It contains two resonators (11, 12) each comprising a piezoelectric crystal (14, 15) and each comprising two electrodes applied to the crystal. A first (11) of the two resonators (11, 12) is mounted in a first chamber (5) containing the gas to be measured, whereas a second (12) is mounted in a second chamber (6) sealed with respect to the gas.
Despite small dimensions and despite simple and robust construction, this device is intended to have a high measurement precision over a long period of time.
This is achieved by drawing the two resonators (11, 12) from a multiplicity of similar resonators manufactured by mass production and not subjected to a frequency alignment. The first resonator (11) is unaltered with respect to the manufacture in mass production. The second resonator (12) is likewise unaltered with respect to the manufacture in mass production and, under vacuum and with equality of temperature, it has the same resonance frequency as the first resonator (11) within a specified frequency tolerance. The second resonator (12) may, however, also be modified, by altering its electrodes (18, 19), in such a way that, under vacuum and with equality of temperature, it has the same resonance frequency as the first resonator (11) within the specified frequency tolerance.
REFERENCES:
patent: 4446720 (1984-05-01), Sinclair
patent: 4561286 (1985-12-01), Sekler et al.
patent: 4734609 (1988-03-01), Jasmine
patent: 5191795 (1993-05-01), Fellingham et al.
Panin, I. A., "Vibrational, Gas Densitometers", Measurement Techniques, vol. 18, No. 7, (USSR transl.) Plenum Publishing Corporation, Jul. 1975, pp. 1090-1092.
Brandle Hubert
Gribi Walter
Haffner Ken-Yves
Asea Brown Boveri Ltd.
Wiggins David
Williams Hezron E.
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