Device for automatic analysis mass spectrometry

A device for the automatic analysis by mass spectrometry of polyphase mixtures which circulate continuously within main pipes, wherein said device comprises:

• pipes constituting a plurality of primary loops (B.sub.i), each of said primary loops (B.sub.i) being connected to one of the main pipes and fitted with a flow regulating valve and a flowmeter in series;
• pipes (T.sub.i), each of said pipes (T.sub.i) being such as to connect a branch point in a primary loop (B.sub.i) to a pneumatic valve (V.sub.j) through the intermediary of a dust filter (F.sub.i) and a needle valve for regulating the flow rate;
• pneumatic valves (V.sub.j) for operably connecting one of the pipes (T.sub.i) to a pipe (T');
• a sampling cell at the extremity of the pipe (T');
• a sampling pipe (T") for connecting one outlet of the sampling cell to a recycling circuit through a delivery valve (V') and a flowmeter in series;
• means for measuring the pressure within the sampling cell;
• means for regulating the pressure within the interior of the sampling cell by regulating the opening of the valve (V') as a function of the difference between a value of the reference pressure and the pressure which is measured within the sampling cell;
• a traced pipe (T'") for connecting the sampling cell to a pneumatic valve (V");
• a capillary tube for connecting the pneumatic valve (V") to a chamber (E);
• pumping means for creating a vacuum within the chamber (E);
• a pipe for connecting the chamber (E) to the ionization chamber of a mass spectrometer;
• electronic means for simultaneously initiating the application of voltage to the accelerating electrodes of the mass spectrometer and the opening of the pneumatic valve (V");
• means for initiating the opening of the pneumatic valves (V.sub.j) according to the mixture to be analyzed.