Measuring relative density of a gas

Details Measuring relative density of a gas Measuring relative density of a gas

G - Physics

01

N

G01N 29/024 (2006.01) G01N 9/24 (2006.01) G01N 9/00 (2006.01)

Patent

CA 2294775

A method and apparatus (4) to measure the relative density of a gas, for example natural gas, in which the gas in supplied through an inlet (8) to chamber (6) and leaves through outlet (10). Using a control (16) and an ultra-sonic transducer emitter (12) and an ultra-sonic transducer receiver (14) the speed of sound in the gas corrected to standard conditions (sc) is calculated, then the control (16) operates to measure the relative density RD of the gas using the formula RD = a SoSsc + b, where SoSsc is the speed of sound in the gas corrected to standard conditions, and a and b are constants.

L'invention concerne un procédé et un appareil (4) de mesure de la densité relative d'un gaz, tel que le gaz naturel, appareil dans lequel le gaz pénètre dans une chambre (6) par une entrée (8) et en sort par une sortie (10). On utilise un dispositif (16) de commande, un émetteur (12) à transducteur ultrasonore et un récepteur (14) à transducteur ultrasonore pour calculer la vitesse du son dans le gaz rapportée aux conditions normales (sc). Puis, le dispositif (16) de commande fonctionne afin de mesurer la densité relative (RD) du gaz en utilisant la formule RD = a x SoSsc + b, où SoSsc correspond à la vitesse de son dans le gaz rapportée aux conditions normales, et a et b sont des constantes.

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