Method and apparatus for determining the phase of a fluid

Details Method and apparatus for determining the phase of a fluid Method and apparatus for determining the phase of a fluid

G - Physics

01

N

G01N 25/02 (2006.01) G01N 25/08 (2006.01)

Patent

CA 2100697

ABSTRACT A method and apparatus for determining whether a fluid, such as a refrigerant, is a liquid or a gas. To determine whether the fluid at a predetermined level (14) of a storage container (20) is a liquid or a gas, fluid is withdrawn from the container at the predetermined level, depressurized under conditions that would cause it to become a gas if it is a liquid before such depressurization, then the temperature of the fluid after depressurization is measured and compared to a reference temperature that is or is related to the temperature of the fluid in the container. If the temperature of the fluid after depressurization and the reference temperature are approximately equal, one can conclude that the fluid withdrawn from the predetermined level is a gas. If the temperature of the fluid after depressurization is considerably lower than the reference temperature, one can conclude that the fluid withdrawn from the predetermined level is a liquid. Such a determination can be used, for example, in order to shut down an apparatus (3) for transferring a refrigerant into a receiv- ing container when the liquid level in the container reaches a predetermined maximum level.

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