Method of measuring specific gravity and apparatus utilizing the

Measuring and testing – Gas analysis – Density or specific gravity

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73 32R, G01N 932

Patent

active

045274185

ABSTRACT:
A method of measuring the specific gravity of a fluid to be analyzed includes the steps of pressurizing a fixed volume chamber by the fluid to be analyzed, allowing the pressure in the chamber to decay through a fixed restriction between predetermined pressure limits, measuring the time interval of the pressure decay between the pressure limits and converting the time interval value to the specific gravity of the fluid to be analyzed. The apparatus utilizing the aforesaid method includes a fixed volume chamber, first valve means for admitting a pressurized fluid to be analyzed into the chamber to pressurize the chamber to a first pressure level, second valve means for exhausting the pressurized fluid from the chamber through the fixed restriction, pressure sensing means for monitoring the pressure decay in the chamber during the exhaust of the pressurized fluid, time interval measuring means for producing a time interval value representative of the time required by the pressure decay between predetermined pressure limits lower than the first pressure level and computing means for converting the time interval value to the specific gravity of the fluid to be analyzed.

REFERENCES:
patent: 3878376 (1975-04-01), Sholes, Jr. et al.
patent: 4285245 (1981-08-01), Kennedy

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