Method and apparatus for measuring the relative density of a...

G - Physics – 01 – N

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G01N 29/02 (2006.01) G01N 9/24 (2006.01) G01N 25/18 (2006.01)

Patent

CA 2318497

Apparatus (2) comprises a chamber (4) to which a gas in question, for example natural gas is supplied through inlet (6) and leaves through outlet (8). The speed of sound SoS at ambient temperature is measured using any suitable method such as electronic control and calculating means (14) and an ultra-sound emitter (10) and an ultra-sound receiver (12). The ambient temperatures T a is observed by temperature sensor (22), and a thermal conductivity sensor measures the thermal conductivity of the gas at two different temperatures above ambient temperature. One value ThC H of the thermal conductivity is measured at 70 °C above ambient and the other value ThC L of the thermal conductivity is measured at 50 °C above ambient. The control means (14) calculates the relative density RD of the gas according to the formula RD = g.ThC H + h.ThC L + i.SoS + j.T a + k.T a2 + 1 where (g, h, i, j, k and 1) are constants.

L'invention concerne un appareil (2) comprenant un compartiment (4) dans lequel on introduit un gaz déterminé, par exemple un gaz naturel, par un orifice d'admission (6) et on l'évacue par un orifice d'évacuation (8). On mesure la vitesse du son (SoS) à température ambiante par tout procédé approprié tel qu'un dispositif électronique de commande et de calcul (14) et un émetteur (10) et récepteur (12) d'ultrasons. On mesure la température (Ta) par un détecteur de température (22) et un détecteur de conductivité thermique permet de mesurer la conductivité thermique du gaz à deux températures différentes au-dessus de la température ambiante. On mesure une valeur ThCH de conductivité thermique à 70 DEG C au-dessus de la température ambiante et l'autre valeur ThCL de conductivité thermique à 50 DEG C au-dessus de la température ambiante. Le dispositif de commande (14) calcule la densité relative (RD) du gaz selon la formule: RD = g.ThCH + h.ThCL + i.SoS + j.Ta + k.Ta<2> + 1 dans laquelle g, h, i, j, k et l sont constants.

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