A diluting sampler and a method for collecting and diluting...

G - Physics – 01 – N

Patent

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G01N 1/22 (2006.01)

Patent

CA 2636857

In the method, for collecting and diluting a gaseous sample disposed at a temperature substantially higher than the normal temperature from a sample space (2), a flow of sample is collected into a sampling tube (3); the flow of sample is introduced from the sampling tube into a sample channel (8) formed by a gas permeable first jacket (7); dilution gas is introduced into a dilution gas space (10) formed by a second jacket (9) enclosing the first jacket and connected by its end to the sampling tube, and further from it, through the first jacket into the sample channel; and heat is conducted from the sample space (2) into the dilution gas space (10) for warming up the dilution gas that comes into contact with the sampling tube (3). According to the invention, in the method, a substantially laminar protection flow, which encloses the flow of sample being released from the sampling tube (3) into the sample channel (8) and is disposed longitudinally to the sample channel, is formed from the warmed up dilution gas.

L'invention concerne un procédé de recueillement et de dilution d'un échantillon gazeux présent à une température essentiellement supérieure à la température normale, à partir d'un espace d'échantillon (2). Selon ledit procédé, un flux d'échantillon (1) est recueilli dans un tube d'échantillonnage (3); le flux d'échantillon est introduit dans un canal d'échantillon (8) à partir du tube d'échantillonnage, ledit canal étant formé par une première chemise perméable aux gaz (7); un gaz de dilution est introduit dans un espace de gaz de dilution (10) formé par une deuxième chemise (9) entourant la première chemise, connectée sur son extrémité au tube d'échantillonnage, puis dans le canal d'échantillon au travers de la première chemise; et de la chaleur est conduite de l'espace d'échantillon (2) vers l'espace de gaz de dilution (10) afin de chauffer le gaz de dilution entrant en contact avec le tube d'échantillonnage (3). Selon l'invention, un flux de protection essentiellement laminaire entourant le flux d'échantillon libéré à partir du tube d'échantillonnage (3) dans le canal d'échantillon (8), essentiellement longitudinal par rapport au canal d'échantillon, est formé à partir du gaz de dilution chauffé.

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