Patent ID: 7752929

Claim:
A device for sampling a fluid in a conduit, comprising: sampling nozzles in the conduit, the sampling nozzles being oriented into a flow of the fluid for sampling the fluid in an area of the conduit; a sample collection manifold connected to the sampling nozzles for collecting and mixing sample streams of the fluid from the sampling nozzles, the sample collection manifold providing a sample flow of the fluid for a sample path; a manifold static pressure port on the sample collection manifold, the manifold static pressure port providing a manifold static pressure inside the sample collection manifold; conduit static pressure ports in the conduit, the conduit static pressure ports being located in the area of the conduit sampled by the sampling nozzles, the conduit static pressure ports providing a conduit static pressure in the area of the conduit sampled by the sampling nozzles; a flow device in the sample path, the flow device adjusting a flow rate of the sample flow such that the manifold static pressure is equal to the conduit static pressure; and wherein a fluid composition in the sample path is a mass average composition of the area in the conduit sampled by the sampling nozzles, and a mass flow rate in the sample path is proportional to a mass average flow rate of the area in the conduit sampled by the sampling nozzles.