Carlo Erba Strumentazione S.p.a.

Thermoquest Italia S.p.a.

Giovanni Ostan

Fausto Munari

Sorin Trestianu

Bruno Tosi

Carlo Saravalle

Giorgio Sisti

Ermete Riva

Enzo Montagner

Giovanni Marchini

A gas chromatography oven is endowed with a shutter for the influx of air from the outside and a pair of shutters for the controlled outflow of air from the oven, the shutters being positioned on the rear wall of the oven, near the corners of the rear wall. On the upper wall of the oven, at least one injector of the sample to be analyzed and at least one detector are lodged in a removable drawer.

Gas chromatograph oven with improved regulation of the air temperature

This invention concerns a method and a device to perform the adjustment of the cooling temperature of a trap for samples in an apparatus of gas chromatographic analysis. The method according to the invention is characterized in that the cooling fluid flow fed to the trap is adjusted by varying the vacuum caused by a suction device downstream the trap, which is capable of sucking the cooling fluid from a vessel upstream the trap itself. The device according to the invention is characterized in that it comprises a suction means placed downstream the trap and connected by means of a first duct to an end of the trap itself, the other end of the trap being connected, by a second duct, to a vessel containing the refrigerating fluid.

Method and device for adjusting the cooling temperature of a sample trap

This invention concerns a chamber for chromatographic analyses, in which capillary columns, in particular columns of fused silica, are thermally conditioned. The chamber comprises a thermally insulated space which can be perfectly sealed towards the outside and which houses means for heating the air and at least a fan for air circulation inside said space. In order to make the air flow going to the column(s) within the chamber as homogeneous and stable as possible from the thermal viewpoint the heating means are positioned on the suction side of the fan or of each fan, so to cause a perfect mixing of cold and hot fluid flow threads or lines in correspondence with the fan itself, and thereby obtain a uniform and stable air current from the fan towards the column.

Chamber for chromatographic analyses

The invention relates to a method and device for direct non-vaporizing on column-injection of samples containing high boiling point and/or medium volatile compounds, in gas chromatographic analysis on capillary column. For reasons of economy, the oven containing the column is maintained at a temperature very mcuh higher than the boiling point of the solvent, while the initial part of the column (at least 10 cm) is cooled during the injection. The quantity of sample and solvent injected is related to the length of the cooled section of the column.

Method and device for the direct on-column injection of samples

The invention relates to a direct on column non-vaporizing injector for gas chromatographic analyses and comprising an accessory device capable of allowing injection with sample vaporization and possible splitting. The accessory device is formed by a tubular element which, at one end, can be fixed to the injector body coaxially to the passage for the injection syringe needle, while its opposite end is closed by an insert provided with an axial hole in which the gas chromatographic capillary column head is pneumatically inserted, said insert being provided with at least one other hole for splitting the vaporized sample. The tubular element houses a vaporization tube which under conditions of thermal exchange with heating means, is pneumatically connected to said passage for the injection syringe needle and to said insert holes and receives the upper end of the gas chromatogaphic column. Gas is employed countercurrently to strip off undesired components while the liquid sample is held in the vaporization chamber.

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Milan, Italy

Giovanni Ostan