Patent ID: 6062092
Filing Date: 2000-05-16
Classification: G01N

Abstract:
A system for extracting samples from a stream flowing in a conduit,comprising:a. a probe located in said conduit, said probe including a channel probe passing a sample flow in the conduit for analysis;b. regulating means for controlling the velocity of the sample flow through said probe channel to correspond to the velocity of the stream flowing in the conduit, said regulating means comprising means for generating a feedback signal representing the relative velocities of the stream flowing in the conduit and the sample flow through said probe channel, said means for generating a feedback signal further comprising first pressure measuring means for determining the pressure within said probe channel, second pressure measuring means for determining the pressure in the conduit, and comparator means for measuring the pressure differential between pressure determined by said first and second pressure measuring means and for generating a signal representative of said pressure differential;c. a dilution conduit carrying diluent fluid from a source, said probe channel communicating with said dilution conduit at a place of entry downstream from said source of diluent fluid; andd. valve means for regulating the flow rate of diluent fluid in said dilution conduit and the flow of sample from said probe channel, according to said comparator means signal.