Patent ID: 7685894

Claim:
A system for extracting a gaseous fluid to be analyzed from a process environment, comprising: a probe for extracting said gaseous fluid, the probe comprising: a first tubular element, which can be positioned within the interior of the process environment, the first tubular element having at one end a gas aspiration opening and defining an internal cavity, and a second tubular element extending within the cavity of the first tubular element, the second tubular element being operable to inject the gaseous fluid into the interior cavity towards the aspiration opening of the first tubular element, and into the process environment; aspiration means for aspirating the gaseous fluid from the process environment through the cavity of the first tubular element of the probe, take off means connected to the aspiration means for taking off a fraction of the gaseous fluid, the take off means being further connected to an analyzer; and re-injection means for re-injecting the gaseous fluid into the process environment through the second tubular element, a compressor having an aspiration side and a delivery side, wherein said aspiration means and the re-injection means share the compressor; wherein the first tubular element is in fluid communication with a control valve, the control valve being selectively operable to fluidly connect said first tubular element with one of the aspiration side or said delivery side of the compressor; and wherein the second tubular element is in fluid communication with the delivery side of said compressor through a reservoir, the second tubular element being throttled in such a way to accelerate the gaseous fluid flowing through it and, at the same time, to allow an accumulation of the gaseous fluid upstream within said reservoir, wherein in an aspiration condition, the gaseous fluid is aspirated through the first tubular element and is partially re-injected through the second tubular element and partially accumulated by the reservoir, and in a back washing condition, the accumulated gaseous fluid is released by the reservoir through the first tubular element by selective activation of the control valve.