Sampler for automatic elemental analysers

G - Physics – 01 – N

Patent

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Details

G01N 31/12 (2006.01) G01N 1/00 (2006.01) B01L 1/02 (2006.01) G01N 1/04 (2006.01)

Patent

CA 2459770

The invention relates to a sampler (102), in particular for automatic elemental analysers, of the so-called "drawer" type, comprising loading means (121), a guide (128), a joining block (131) for joining said loading means (121) and said guide (128), an admission piston (126), a purge chamber (134) for a sample (103) to be analysed, a system for injecting (133) a purge gas into said purge chamber (134), which in its turn comprises: an inner passage (136) of said admission piston (126), said admission piston (126) being movable between a drop position (124) and an feeding position (127) for the sample (103) to be analysed; a passage (132)of said joining block (131); a passage (123) of said loading means (121) aligned with the drop position (124) for the sample (103) to be analysed. According to the present invention, means to direct the flow (40) in said purge chamber (134) is comprised within the purge chamber, in order to avoid the phenomenon of retro-diffusion of the ambient atmospheric gases in said purge chamber (134).

L'invention se rapporte à un échantillonneur (102), destiné en particulier à des analyseurs d'éléments automatiques, de type dit <= à tiroirs >=, comprenant : des moyens de chargement (121), un guide (128), un bloc de liaison (131) reliant lesdits moyens de chargement (121) et ledit guide (128), un piston d'admission (126), une chambre de purge (134) destinée à l'analyse de l'échantillon (103), un système permettant d'injecter (133) un gaz de purge dans la chambre de purge (134). Ladite chambre de purge comporte : un passage interne (136) pour le piston d'admission (126), ledit piston d'admission (126) étant mobile entre une position de chute (124) et une position d'alimentation (127) pour permettre l'analyse de l'échantillon (103); un passage (132) pour le bloc de liaison (131) ; un passage (123) pour les moyens de chargement (121),aligné avec la position de chute (124) pour permettre l'analyse de l'échantillon (103). Selon la présente invention, un moyen dirigeant le flux (40) dans la chambre de purge (134) est placé à l'intérieur de la chambre de purge, afin d'empêcher tout phénomène de rétrodiffusion des gaz atmosphériques ambiants dans ladite chambre de purge (134).

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