Patent ID: 7028563

Claim:
A fluid sampling system comprising: a plurality of sampling channels, each of said sampling channels comprising: a sampling line having an inlet, a regulated outlet, and first and second calibrated flow orifices connected in series between the inlet and outlet; and a controllable derivation line connected between the first and second orifices, for deviating fluid from the sampling line; a connecting line for connecting together the outlets of the sampling lines, the connecting line having a main regulated outlet for providing a fluid sample; and control means for controlling pressures between first and second orifices of all of the sampling lines by means of the controllable derivation lines, thereby increasing pressure between first and second orifices of one of the sampling lines which is then selected to provide said fluid sample to the outlet of the connecting line, and decreasing pressure between first and second orifices of remaining sampling lines to back purge said remaining sampling lines.