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Method and apparatus for measuring molecular weight of gas

A technology of molecular weight and gas, applied in the direction of specific gravity measurement, measuring device, using sound wave/ultrasonic wave/infrasonic wave to analyze fluid, etc.

Active Publication Date: 2018-11-16
AIR PROD & CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Additionally, complex excitation and detection components are required to compensate for temperature effects

Method used

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  • Method and apparatus for measuring molecular weight of gas
  • Method and apparatus for measuring molecular weight of gas
  • Method and apparatus for measuring molecular weight of gas

Examples

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Embodiment Construction

[0071] figure 1 A schematic diagram of a gas canister assembly 10 according to an embodiment of the present invention is shown.

[0072] figure 1 A schematic diagram showing a situation in which the invention can be used. A gas tank 100, a regulator 150, and a molecular weight meter 200 are provided.

[0073] The gas tank 100 has a gas tank body 102 and a valve 104 . The gas tank body 102 comprises a generally cylindrical pressure vessel having a flat base 102a arranged to enable the gas tank assembly 10 to stand freestanding on a flat surface.

[0074] The gas tank body 102 is formed from steel, aluminum, and / or composite material, and is adapted and arranged to withstand internal pressures of up to about 900 bar (gauge). Orifice 106 is located at the proximal end of gas canister body 102 opposite base 102a and includes threads (not shown) adapted to receive valve 104 .

[0075] Gas tank 100 defines a pressure vessel having an internal volume V. As shown in FIG. Any sui...

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Abstract

An apparatus for measuring the molecular weight of gas is provided. The apparatus includes a housing having an inlet and an interior for receiving said gas to be measured, a sensor assembly comprisinga high-frequency planar piezoelectric crystal oscillator located within said housing so that, in use, the piezoelectric crystal oscillator is in contact with said gas, said sensor assembly being arranged: to drive the piezoelectric crystal oscillator such that the piezoelectric crystal oscillator resonates at a single resonant frequency; to measure said single resonant frequency of said piezoelectric crystal oscillator to determine the density of gas; and to determine from the density, determined or pre-determined pressure of the gas and determined or pre-determined temperature of the gas, the molecular weight of the gas.

Description

[0001] This application is a divisional application of the PCT application "Method and Apparatus for Measuring the Molecular Weight of Gases" (Application No.: 201180066240.6, Applicant: Gas Products and Chemicals Company) that entered the Chinese national phase on July 29, 2013. technical field [0002] The present invention relates to methods and devices for measuring the molecular weight of gases. More particularly, the present invention relates to methods and apparatus for measuring the molecular weight (or, in the case of a mixture of gases, the average molecular weight) of a gas using a piezoelectric crystal oscillator. Background technique [0003] The methods and apparatus described herein are applicable to systems in which fluids are present at relatively high pressures (eg, about 10 bar or higher), such as, for example, gas supplies in high pressure tanks or process installations using high pressure fluids. In particular, the invention relates to "clean" gases, ie ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/036G01N9/00
CPCG01N29/036G01N2291/021G01N2291/02818G01N9/002G01N9/00G01N27/00
Inventor N.A.道尼
Owner AIR PROD & CHEM INC
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