Patent ID: 8434372

Claim:
A fluid analysis system for analysis of a fluid in a pipe flow flowing in a pipe or in a pipeline, which fluid analysis system comprises a pipe portion which, when the fluid analysis system is put to use, forms a part of the pipe or the pipeline through which the fluid flows, which pipe portion is provided with a fluid sample outlet for withdrawal of fluid samples from the pipe flow in the pipe portion and a fluid sample return outlet for returning fluid samples to the pipe flow in the pipe portion, which fluid sample return outlet is arranged downstream of the fluid sample outlet; a fluid analyser which is provided in fluid communication with the fluid sample outlet and the fluid sample return outlet, wherein the fluid analysis system further comprises a propeller unit which is provided with at least one upstream propeller and at least one downstream propeller, which propeller unit is mounted in the pipe portion in such a manner that the upstream propeller is located upstream of the fluid sample outlet, thereby enabling the upstream propeller to mix the pipe flow in the pipe portion before fluid samples are withdrawn through the fluid sample outlet, the downstream propeller is located downstream of the fluid sample outlet and upstream of the fluid sample return outlet, thereby enabling the downstream propeller to provide a pressure drop in the pipe portion between the fluid sample outlet and the fluid sample return outlet which is sufficient to drive the fluid samples through the fluid analysis system.