Method For Containing A Sample Of A Gaseous Mixture Flowing In A Pipeline And Corresponding Device

A method for conditioning a sample of a gaseous mixture flowing in a pipeline at a flow velocity for analyzing it with at least one analyzer, the operating conditions of which are not compatible with the physico-chemical conditions of the gaseous mixture in the pipeline, the method comprising:

• collecting a sample representative of the gaseous mixture and the particles possibly contained therein in the pipeline, without cut-off or filtering;
• diluting the collected sample with a dry dilution gas in a first dilution chamber located in the pipeline at a dilution temperature (T_dil) equal or close to a temperature of the gaseous mixture in the pipeline during the collection step (T_prel);
• and
• conveying the collected and diluted sample toward the outside of the pipeline through an outlet tube in view of analyzing it by said analyzer.

A device for conditioning a sample collected in a gaseous mixture flowing in a pipeline at a flow velocity for analyzing it by at least one analyzer, the operating conditions of which are not compatible with the physico-chemical conditions of the gaseous mixture in the pipeline, the device comprising:

• a first dilution chamber configured to be located in the pipeline to dilute the sample with a dilution gas at a dilution temperature (T_dil) equal or close to a temperature of the gaseous mixture in the pipeline (T_prel);
• the first dilution chamber including;
• a collection inlet by which the collected sample is conveyed in the first dilution chamber,
• a dilution inlet, distinct from the collection inlet, for conveying a dilution gas,
• an outlet tube for conveying the collected and diluted sample from the first dilution chamber toward an outside of the first dilution chamber for analysis by the analyzer,
• a collection tube mounted on the collection inlet, or
• a set of at least one collection spout in which each collection spout is configured to be mounted on the collection inlet, or
• a set of at least one collection tube one of which is mounted on the collection inlet, and a set of at least one collection spout, in which each collection spout is configured to be mounted on a respective collection tube or on a same collection tube,
• in which the collection tube is straight, and has its own axis of elongation coincident with that of the dilution chamber, and parallel to the direction of the gaseous flow in the pipeline.